In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix use-after-free in bond_xmit_broadcast() bond_xmit_broadcast() reuses the original skb for the last slave (determined by bond_is_last_slave()) and clones it for others. Concurrent slave enslave/release can mutate the slave list during RCU-protected iteration, changing which slave is "last" mid-loop. This causes the original skb to be double-consumed (double-freed). Replace the racy bond_is_last_slave() check with a simple index comparison (i + 1 == slaves_count) against the pre-snapshot slave count taken via READ_ONCE() before the loop. This preserves the zero-copy optimization for the last slave while making the "last" determination stable against concurrent list mutations. The UAF can trigger the following crash: ================================================================== BUG: KASAN: slab-use-after-free in skb_clone Read of size 8 at addr ffff888100ef8d40 by task exploit/147 CPU: 1 UID: 0 PID: 147 Comm: exploit Not tainted 7.0.0-rc3+ #4 PREEMPTLAZY Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:597) skb_clone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108) bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5334) bond_start_xmit (drivers/net/bonding/bond_main.c:5567 drivers/net/bonding/bond_main.c:5593) dev_hard_start_xmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887) __dev_queue_xmit (include/linux/netdevice.h:3601 net/core/dev.c:4838) ip6_finish_output2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6_output.c:136) ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219) ip6_output (net/ipv6/ip6_output.c:250) ip6_send_skb (net/ipv6/ip6_output.c:1985) udp_v6_send_skb (net/ipv6/udp.c:1442) udpv6_sendmsg (net/ipv6/udp.c:1733) __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Allocated by task 147: Freed by task 147: The buggy address belongs to the object at ffff888100ef8c80 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 192 bytes inside of freed 224-byte region [ffff888100ef8c80, ffff888100ef8d60) Memory state around the buggy address: ffff888100ef8c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff888100ef8c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888100ef8d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888100ef8d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888100ef8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:13566 cve-icon
https://access.redhat.com/errata/RHSA-2026:19521 cve-icon
https://access.redhat.com/errata/RHSA-2026:21209 cve-icon
https://access.redhat.com/errata/RHSA-2026:22334 cve-icon
https://access.redhat.com/errata/RHSA-2026:22900 cve-icon
https://access.redhat.com/errata/RHSA-2026:22940 cve-icon
https://access.redhat.com/errata/RHSA-2026:23224 cve-icon
https://access.redhat.com/errata/RHSA-2026:25191 cve-icon
https://access.redhat.com/errata/RHSA-2026:25217 cve-icon
https://access.redhat.com/errata/RHSA-2026:27353 cve-icon
https://access.redhat.com/errata/RHSA-2026:27354 cve-icon
https://access.redhat.com/errata/RHSA-2026:35870 cve-icon
https://access.redhat.com/errata/RHSA-2026:36172 cve-icon
https://access.redhat.com/errata/RHSA-2026:36530 cve-icon
https://access.redhat.com/errata/RHSA-2026:36531 cve-icon
https://access.redhat.com/errata/RHSA-2026:36532 cve-icon
https://access.redhat.com/errata/RHSA-2026:36533 cve-icon
https://access.redhat.com/errata/RHSA-2026:36534 cve-icon
https://access.redhat.com/security/cve/CVE-2026-31419 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2457829 cve-icon
https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16 cve-icon cve-icon
https://git.kernel.org/stable/c/2de5c8eea0a9db99dae7c36f4b541b74b41d3a04 cve-icon cve-icon
https://git.kernel.org/stable/c/a0f661918edc79d7a75e468128af8d41e2a1a83a cve-icon cve-icon
https://git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c cve-icon cve-icon
https://git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2026041353-CVE-2026-31419-e176@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-31419 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31419.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-31419 cve-icon
History

Sat, 04 Jul 2026 12:15:00 +0000


Fri, 19 Jun 2026 12:45:00 +0000


Wed, 20 May 2026 19:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*

Thu, 07 May 2026 05:30:00 +0000


Wed, 29 Apr 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Wed, 29 Apr 2026 01:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Mon, 27 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Tue, 14 Apr 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Tue, 14 Apr 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


Mon, 13 Apr 2026 13:45:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix use-after-free in bond_xmit_broadcast() bond_xmit_broadcast() reuses the original skb for the last slave (determined by bond_is_last_slave()) and clones it for others. Concurrent slave enslave/release can mutate the slave list during RCU-protected iteration, changing which slave is "last" mid-loop. This causes the original skb to be double-consumed (double-freed). Replace the racy bond_is_last_slave() check with a simple index comparison (i + 1 == slaves_count) against the pre-snapshot slave count taken via READ_ONCE() before the loop. This preserves the zero-copy optimization for the last slave while making the "last" determination stable against concurrent list mutations. The UAF can trigger the following crash: ================================================================== BUG: KASAN: slab-use-after-free in skb_clone Read of size 8 at addr ffff888100ef8d40 by task exploit/147 CPU: 1 UID: 0 PID: 147 Comm: exploit Not tainted 7.0.0-rc3+ #4 PREEMPTLAZY Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:597) skb_clone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108) bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5334) bond_start_xmit (drivers/net/bonding/bond_main.c:5567 drivers/net/bonding/bond_main.c:5593) dev_hard_start_xmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887) __dev_queue_xmit (include/linux/netdevice.h:3601 net/core/dev.c:4838) ip6_finish_output2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6_output.c:136) ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219) ip6_output (net/ipv6/ip6_output.c:250) ip6_send_skb (net/ipv6/ip6_output.c:1985) udp_v6_send_skb (net/ipv6/udp.c:1442) udpv6_sendmsg (net/ipv6/udp.c:1733) __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Allocated by task 147: Freed by task 147: The buggy address belongs to the object at ffff888100ef8c80 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 192 bytes inside of freed 224-byte region [ffff888100ef8c80, ffff888100ef8d60) Memory state around the buggy address: ffff888100ef8c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff888100ef8c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888100ef8d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888100ef8d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888100ef8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
Title net: bonding: fix use-after-free in bond_xmit_broadcast()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-04-13T13:40:23.279Z

Updated: 2026-08-05T12:22:23.280Z

Reserved: 2026-03-09T15:48:24.088Z

Link: CVE-2026-31419

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2026-04-13T14:16:11.447

Modified: 2026-07-15T02:19:47.357

Link: CVE-2026-31419

cve-icon Redhat

Severity : Important

Publid Date: 2026-04-13T00:00:00Z

Links: CVE-2026-31419 - Bugzilla