{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-38464", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.020Z", "datePublished": "2025-07-25T15:27:46.708Z", "dateUpdated": "2025-07-28T04:23:12.269Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-07-28T04:23:12.269Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Fix use-after-free in tipc_conn_close().\n\nsyzbot reported a null-ptr-deref in tipc_conn_close() during netns\ndismantle. [0]\n\ntipc_topsrv_stop() iterates tipc_net(net)->topsrv->conn_idr and calls\ntipc_conn_close() for each tipc_conn.\n\nThe problem is that tipc_conn_close() is called after releasing the\nIDR lock.\n\nAt the same time, there might be tipc_conn_recv_work() running and it\ncould call tipc_conn_close() for the same tipc_conn and release its\nlast ->kref.\n\nOnce we release the IDR lock in tipc_topsrv_stop(), there is no\nguarantee that the tipc_conn is alive.\n\nLet's hold the ref before releasing the lock and put the ref after\ntipc_conn_close() in tipc_topsrv_stop().\n\n[0]:\nBUG: KASAN: use-after-free in tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\nRead of size 8 at addr ffff888099305a08 by task kworker/u4:3/435\n\nCPU: 0 PID: 435 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1fc/0x2ef lib/dump_stack.c:118\n print_address_description.cold+0x54/0x219 mm/kasan/report.c:256\n kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354\n kasan_report mm/kasan/report.c:412 [inline]\n __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433\n tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\n tipc_topsrv_stop net/tipc/topsrv.c:701 [inline]\n tipc_topsrv_exit_net+0x27b/0x5c0 net/tipc/topsrv.c:722\n ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153\n cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nAllocated by task 23:\n kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625\n kmalloc include/linux/slab.h:515 [inline]\n kzalloc include/linux/slab.h:709 [inline]\n tipc_conn_alloc+0x43/0x4f0 net/tipc/topsrv.c:192\n tipc_topsrv_accept+0x1b5/0x280 net/tipc/topsrv.c:470\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nFreed by task 23:\n __cache_free mm/slab.c:3503 [inline]\n kfree+0xcc/0x210 mm/slab.c:3822\n tipc_conn_kref_release net/tipc/topsrv.c:150 [inline]\n kref_put include/linux/kref.h:70 [inline]\n conn_put+0x2cd/0x3a0 net/tipc/topsrv.c:155\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nThe buggy address belongs to the object at ffff888099305a00\n which belongs to the cache kmalloc-512 of size 512\nThe buggy address is located 8 bytes inside of\n 512-byte region [ffff888099305a00, ffff888099305c00)\nThe buggy address belongs to the page:\npage:ffffea000264c140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0\nflags: 0xfff00000000100(slab)\nraw: 00fff00000000100 ffffea00028b6b88 ffffea0002cd2b08 ffff88813bff0940\nraw: 0000000000000000 ffff888099305000 0000000100000006 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff888099305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n>ffff888099305a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff888099305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/topsrv.c"], "versions": [{"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "03dcdd2558e1e55bf843822fe4363dcb48743f2b", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "15a6f4971e2f157d57e09ea748d1fbc714277aa4", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "dab8ded2e5ff41012a6ff400b44dbe76ccf3592a", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "1dbf7cd2454a28b1da700085b99346b5445aeabb", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "be4b8392da7978294f2f368799d29dd509fb6c4d", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "50aa2d121bc2cfe2d825f8a331ea75dfaaab6a50", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "3b89e17b2fd64012682bed158d9eb3d2e96dec42", "status": "affected", "versionType": "git"}, {"version": "c5fa7b3cf3cb22e4ac60485fc2dc187fe012910f", "lessThan": "667eeab4999e981c96b447a4df5f20bdf5c26f13", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/topsrv.c"], "versions": [{"version": "3.11", "status": "affected"}, {"version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.296", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.240", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.189", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.146", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.99", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.39", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.7", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.4.296"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.10.240"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "5.15.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.1.146"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.99"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.15.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/03dcdd2558e1e55bf843822fe4363dcb48743f2b"}, {"url": "https://git.kernel.org/stable/c/15a6f4971e2f157d57e09ea748d1fbc714277aa4"}, {"url": "https://git.kernel.org/stable/c/dab8ded2e5ff41012a6ff400b44dbe76ccf3592a"}, {"url": "https://git.kernel.org/stable/c/1dbf7cd2454a28b1da700085b99346b5445aeabb"}, {"url": "https://git.kernel.org/stable/c/be4b8392da7978294f2f368799d29dd509fb6c4d"}, {"url": "https://git.kernel.org/stable/c/50aa2d121bc2cfe2d825f8a331ea75dfaaab6a50"}, {"url": "https://git.kernel.org/stable/c/3b89e17b2fd64012682bed158d9eb3d2e96dec42"}, {"url": "https://git.kernel.org/stable/c/667eeab4999e981c96b447a4df5f20bdf5c26f13"}], "title": "tipc: Fix use-after-free in tipc_conn_close().", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Fix use-after-free in tipc_conn_close().\n\nsyzbot reported a null-ptr-deref in tipc_conn_close() during netns\ndismantle. [0]\n\ntipc_topsrv_stop() iterates tipc_net(net)->topsrv->conn_idr and calls\ntipc_conn_close() for each tipc_conn.\n\nThe problem is that tipc_conn_close() is called after releasing the\nIDR lock.\n\nAt the same time, there might be tipc_conn_recv_work() running and it\ncould call tipc_conn_close() for the same tipc_conn and release its\nlast ->kref.\n\nOnce we release the IDR lock in tipc_topsrv_stop(), there is no\nguarantee that the tipc_conn is alive.\n\nLet's hold the ref before releasing the lock and put the ref after\ntipc_conn_close() in tipc_topsrv_stop().\n\n[0]:\nBUG: KASAN: use-after-free in tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\nRead of size 8 at addr ffff888099305a08 by task kworker/u4:3/435\n\nCPU: 0 PID: 435 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1fc/0x2ef lib/dump_stack.c:118\n print_address_description.cold+0x54/0x219 mm/kasan/report.c:256\n kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354\n kasan_report mm/kasan/report.c:412 [inline]\n __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433\n tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\n tipc_topsrv_stop net/tipc/topsrv.c:701 [inline]\n tipc_topsrv_exit_net+0x27b/0x5c0 net/tipc/topsrv.c:722\n ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153\n cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nAllocated by task 23:\n kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625\n kmalloc include/linux/slab.h:515 [inline]\n kzalloc include/linux/slab.h:709 [inline]\n tipc_conn_alloc+0x43/0x4f0 net/tipc/topsrv.c:192\n tipc_topsrv_accept+0x1b5/0x280 net/tipc/topsrv.c:470\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nFreed by task 23:\n __cache_free mm/slab.c:3503 [inline]\n kfree+0xcc/0x210 mm/slab.c:3822\n tipc_conn_kref_release net/tipc/topsrv.c:150 [inline]\n kref_put include/linux/kref.h:70 [inline]\n conn_put+0x2cd/0x3a0 net/tipc/topsrv.c:155\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nThe buggy address belongs to the object at ffff888099305a00\n which belongs to the cache kmalloc-512 of size 512\nThe buggy address is located 8 bytes inside of\n 512-byte region [ffff888099305a00, ffff888099305c00)\nThe buggy address belongs to the page:\npage:ffffea000264c140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0\nflags: 0xfff00000000100(slab)\nraw: 00fff00000000100 ffffea00028b6b88 ffffea0002cd2b08 ffff88813bff0940\nraw: 0000000000000000 ffff888099305000 0000000100000006 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff888099305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n>ffff888099305a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff888099305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: Se ha corregido el error use-after-free en tipc_conn_close(). syzbot inform\u00f3 de un error \"null-ptr-deref\" en tipc_conn_close() durante el desmantelamiento de netns. [0] tipc_topsrv_stop() itera tipc_net(net)->topsrv->conn_idr e invoca tipc_conn_close() para cada tipc_conn. El problema es que tipc_conn_close() se invoca tras liberar el bloqueo IDR. Simult\u00e1neamente, tipc_conn_recv_work() podr\u00eda estar ejecut\u00e1ndose y podr\u00eda invocar tipc_conn_close() para el mismo tipc_conn y liberar su \u00faltimo ->kref. Una vez que liberamos el bloqueo IDR en tipc_topsrv_stop(), no hay garant\u00eda de que tipc_conn siga activo. Mantengamos la referencia antes de liberar el bloqueo y coloquemos la referencia despu\u00e9s de tipc_conn_close() en tipc_topsrv_stop(). [0]: BUG: KASAN: use-after-free in tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165 Read of size 8 at addr ffff888099305a08 by task kworker/u4:3/435 CPU: 0 PID: 435 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165 tipc_topsrv_stop net/tipc/topsrv.c:701 [inline] tipc_topsrv_exit_net+0x27b/0x5c0 net/tipc/topsrv.c:722 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Allocated by task 23: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] tipc_conn_alloc+0x43/0x4f0 net/tipc/topsrv.c:192 tipc_topsrv_accept+0x1b5/0x280 net/tipc/topsrv.c:470 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 23: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 tipc_conn_kref_release net/tipc/topsrv.c:150 [inline] kref_put include/linux/kref.h:70 [inline] conn_put+0x2cd/0x3a0 net/tipc/topsrv.c:155 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff888099305a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff888099305a00, ffff888099305c00) The buggy address belongs to the page: page:ffffea000264c140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00028b6b88 ffffea0002cd2b08 ffff88813bff0940 raw: 0000000000000000 ffff888099305000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099305980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888099305a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888099305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099305b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb"}], "id": "CVE-2025-38464", "lastModified": "2025-07-29T14:14:55.157", "metrics": {}, "published": "2025-07-25T16:15:32.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03dcdd2558e1e55bf843822fe4363dcb48743f2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15a6f4971e2f157d57e09ea748d1fbc714277aa4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1dbf7cd2454a28b1da700085b99346b5445aeabb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b89e17b2fd64012682bed158d9eb3d2e96dec42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50aa2d121bc2cfe2d825f8a331ea75dfaaab6a50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/667eeab4999e981c96b447a4df5f20bdf5c26f13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be4b8392da7978294f2f368799d29dd509fb6c4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dab8ded2e5ff41012a6ff400b44dbe76ccf3592a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: tipc: Fix use-after-free in tipc_conn_close()", "id": "2383509", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383509"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntipc: Fix use-after-free in tipc_conn_close().\nsyzbot reported a null-ptr-deref in tipc_conn_close() during netns\ndismantle. [0]\ntipc_topsrv_stop() iterates tipc_net(net)->topsrv->conn_idr and calls\ntipc_conn_close() for each tipc_conn.\nThe problem is that tipc_conn_close() is called after releasing the\nIDR lock.\nAt the same time, there might be tipc_conn_recv_work() running and it\ncould call tipc_conn_close() for the same tipc_conn and release its\nlast ->kref.\nOnce we release the IDR lock in tipc_topsrv_stop(), there is no\nguarantee that the tipc_conn is alive.\nLet's hold the ref before releasing the lock and put the ref after\ntipc_conn_close() in tipc_topsrv_stop().\n[0]:\nBUG: KASAN: use-after-free in tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\nRead of size 8 at addr ffff888099305a08 by task kworker/u4:3/435\nCPU: 0 PID: 435 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nCall Trace:\n__dump_stack lib/dump_stack.c:77 [inline]\ndump_stack+0x1fc/0x2ef lib/dump_stack.c:118\nprint_address_description.cold+0x54/0x219 mm/kasan/report.c:256\nkasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354\nkasan_report mm/kasan/report.c:412 [inline]\n__asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433\ntipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\ntipc_topsrv_stop net/tipc/topsrv.c:701 [inline]\ntipc_topsrv_exit_net+0x27b/0x5c0 net/tipc/topsrv.c:722\nops_exit_list+0xa5/0x150 net/core/net_namespace.c:153\ncleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553\nprocess_one_work+0x864/0x1570 kernel/workqueue.c:2153\nworker_thread+0x64c/0x1130 kernel/workqueue.c:2296\nkthread+0x33f/0x460 kernel/kthread.c:259\nret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\nAllocated by task 23:\nkmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625\nkmalloc include/linux/slab.h:515 [inline]\nkzalloc include/linux/slab.h:709 [inline]\ntipc_conn_alloc+0x43/0x4f0 net/tipc/topsrv.c:192\ntipc_topsrv_accept+0x1b5/0x280 net/tipc/topsrv.c:470\nprocess_one_work+0x864/0x1570 kernel/workqueue.c:2153\nworker_thread+0x64c/0x1130 kernel/workqueue.c:2296\nkthread+0x33f/0x460 kernel/kthread.c:259\nret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\nFreed by task 23:\n__cache_free mm/slab.c:3503 [inline]\nkfree+0xcc/0x210 mm/slab.c:3822\ntipc_conn_kref_release net/tipc/topsrv.c:150 [inline]\nkref_put include/linux/kref.h:70 [inline]\nconn_put+0x2cd/0x3a0 net/tipc/topsrv.c:155\nprocess_one_work+0x864/0x1570 kernel/workqueue.c:2153\nworker_thread+0x64c/0x1130 kernel/workqueue.c:2296\nkthread+0x33f/0x460 kernel/kthread.c:259\nret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\nThe buggy address belongs to the object at ffff888099305a00\nwhich belongs to the cache kmalloc-512 of size 512\nThe buggy address is located 8 bytes inside of\n512-byte region [ffff888099305a00, ffff888099305c00)\nThe buggy address belongs to the page:\npage:ffffea000264c140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0\nflags: 0xfff00000000100(slab)\nraw: 00fff00000000100 ffffea00028b6b88 ffffea0002cd2b08 ffff88813bff0940\nraw: 0000000000000000 ffff888099305000 0000000100000006 0000000000000000\npage dumped because: kasan: bad access detected\nMemory state around the buggy address:\nffff888099305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\nffff888099305980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n>ffff888099305a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n^\nffff888099305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\nffff888099305b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb"], "name": "CVE-2025-38464", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38464\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38464\nhttps://lore.kernel.org/linux-cve-announce/2025072508-CVE-2025-38464-44a1@gregkh/T"], "threat_severity": "Moderate"}