{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2022-49526", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.588Z", "datePublished": "2025-02-26T02:13:49.145Z", "dateUpdated": "2025-05-04T08:39:49.359Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T08:39:49.359Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/bitmap: don't set sb values if can't pass sanity check\n\nIf bitmap area contains invalid data, kernel will crash then mdadm\ntriggers \"Segmentation fault\".\nThis is cluster-md speical bug. In non-clustered env, mdadm will\nhandle broken metadata case. In clustered array, only kernel space\nhandles bitmap slot info. But even this bug only happened in clustered\nenv, current sanity check is wrong, the code should be changed.\n\nHow to trigger: (faulty injection)\n\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sda\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sdb\nmdadm -C /dev/md0 -b clustered -e 1.2 -n 2 -l mirror /dev/sda /dev/sdb\nmdadm -Ss\necho aaa > magic.txt\n == below modifying slot 2 bitmap data ==\ndd if=magic.txt of=/dev/sda seek=16384 bs=1 count=3 <== destroy magic\ndd if=/dev/zero of=/dev/sda seek=16436 bs=1 count=4 <== ZERO chunksize\nmdadm -A /dev/md0 /dev/sda /dev/sdb\n == kernel crashes. mdadm outputs \"Segmentation fault\" ==\n\nReason of kernel crash:\n\nIn md_bitmap_read_sb (called by md_bitmap_create), bad bitmap magic didn't\nblock chunksize assignment, and zero value made DIV_ROUND_UP_SECTOR_T()\ntrigger \"divide error\".\n\nCrash log:\n\nkernel: md: md0 stopped.\nkernel: md/raid1:md0: not clean -- starting background reconstruction\nkernel: md/raid1:md0: active with 2 out of 2 mirrors\nkernel: dlm: ... ...\nkernel: md-cluster: Joined cluster 44810aba-38bb-e6b8-daca-bc97a0b254aa slot 1\nkernel: md0: invalid bitmap file superblock: bad magic\nkernel: md_bitmap_copy_from_slot can't get bitmap from slot 2\nkernel: md-cluster: Could not gather bitmaps from slot 2\nkernel: divide error: 0000 [#1] SMP NOPTI\nkernel: CPU: 0 PID: 1603 Comm: mdadm Not tainted 5.14.6-1-default\nkernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]\nkernel: RSP: 0018:ffffc22ac0843ba0 EFLAGS: 00010246\nkernel: ... ...\nkernel: Call Trace:\nkernel: ? dlm_lock_sync+0xd0/0xd0 [md_cluster 77fe..7a0]\nkernel: md_bitmap_copy_from_slot+0x2c/0x290 [md_mod 24ea..d3a]\nkernel: load_bitmaps+0xec/0x210 [md_cluster 77fe..7a0]\nkernel: md_bitmap_load+0x81/0x1e0 [md_mod 24ea..d3a]\nkernel: do_md_run+0x30/0x100 [md_mod 24ea..d3a]\nkernel: md_ioctl+0x1290/0x15a0 [md_mod 24ea....d3a]\nkernel: ? mddev_unlock+0xaa/0x130 [md_mod 24ea..d3a]\nkernel: ? blkdev_ioctl+0xb1/0x2b0\nkernel: block_ioctl+0x3b/0x40\nkernel: __x64_sys_ioctl+0x7f/0xb0\nkernel: do_syscall_64+0x59/0x80\nkernel: ? exit_to_user_mode_prepare+0x1ab/0x230\nkernel: ? syscall_exit_to_user_mode+0x18/0x40\nkernel: ? do_syscall_64+0x69/0x80\nkernel: entry_SYSCALL_64_after_hwframe+0x44/0xae\nkernel: RIP: 0033:0x7f4a15fa722b\nkernel: ... ...\nkernel: ---[ end trace 8afa7612f559c868 ]---\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md-bitmap.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "422e8f7ba1e08c8e0e88d375bcb550bc2bbfe96d", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0959aa00f9765bd8c654b1365012e41b51c733cc", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e69e93120f6219b9cc4fba3b515b6ababd8548aa", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "27f672af28a8e9b783ff7f0eaf7ef2fbd5a2f4ba", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cf9392282a2cf5a8d83dd1c5aa1a097e12f172bc", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d8f1558e1daf54f53a90b4c5700ae3e3a4b13412", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "e68cb83a57a458b01c9739e2ad9cb70b04d1e6d2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md-bitmap.c"], "versions": [{"version": "4.19.247", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.198", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.121", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19", "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:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.19.247"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.4.198"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.10.121"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.15.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.17.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.18.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/422e8f7ba1e08c8e0e88d375bcb550bc2bbfe96d"}, {"url": "https://git.kernel.org/stable/c/0959aa00f9765bd8c654b1365012e41b51c733cc"}, {"url": "https://git.kernel.org/stable/c/e69e93120f6219b9cc4fba3b515b6ababd8548aa"}, {"url": "https://git.kernel.org/stable/c/27f672af28a8e9b783ff7f0eaf7ef2fbd5a2f4ba"}, {"url": "https://git.kernel.org/stable/c/cf9392282a2cf5a8d83dd1c5aa1a097e12f172bc"}, {"url": "https://git.kernel.org/stable/c/d8f1558e1daf54f53a90b4c5700ae3e3a4b13412"}, {"url": "https://git.kernel.org/stable/c/e68cb83a57a458b01c9739e2ad9cb70b04d1e6d2"}], "title": "md/bitmap: don't set sb values if can't pass sanity check", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/bitmap: don't set sb values if can't pass sanity check\n\nIf bitmap area contains invalid data, kernel will crash then mdadm\ntriggers \"Segmentation fault\".\nThis is cluster-md speical bug. In non-clustered env, mdadm will\nhandle broken metadata case. In clustered array, only kernel space\nhandles bitmap slot info. But even this bug only happened in clustered\nenv, current sanity check is wrong, the code should be changed.\n\nHow to trigger: (faulty injection)\n\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sda\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sdb\nmdadm -C /dev/md0 -b clustered -e 1.2 -n 2 -l mirror /dev/sda /dev/sdb\nmdadm -Ss\necho aaa > magic.txt\n == below modifying slot 2 bitmap data ==\ndd if=magic.txt of=/dev/sda seek=16384 bs=1 count=3 <== destroy magic\ndd if=/dev/zero of=/dev/sda seek=16436 bs=1 count=4 <== ZERO chunksize\nmdadm -A /dev/md0 /dev/sda /dev/sdb\n == kernel crashes. mdadm outputs \"Segmentation fault\" ==\n\nReason of kernel crash:\n\nIn md_bitmap_read_sb (called by md_bitmap_create), bad bitmap magic didn't\nblock chunksize assignment, and zero value made DIV_ROUND_UP_SECTOR_T()\ntrigger \"divide error\".\n\nCrash log:\n\nkernel: md: md0 stopped.\nkernel: md/raid1:md0: not clean -- starting background reconstruction\nkernel: md/raid1:md0: active with 2 out of 2 mirrors\nkernel: dlm: ... ...\nkernel: md-cluster: Joined cluster 44810aba-38bb-e6b8-daca-bc97a0b254aa slot 1\nkernel: md0: invalid bitmap file superblock: bad magic\nkernel: md_bitmap_copy_from_slot can't get bitmap from slot 2\nkernel: md-cluster: Could not gather bitmaps from slot 2\nkernel: divide error: 0000 [#1] SMP NOPTI\nkernel: CPU: 0 PID: 1603 Comm: mdadm Not tainted 5.14.6-1-default\nkernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]\nkernel: RSP: 0018:ffffc22ac0843ba0 EFLAGS: 00010246\nkernel: ... ...\nkernel: Call Trace:\nkernel: ? dlm_lock_sync+0xd0/0xd0 [md_cluster 77fe..7a0]\nkernel: md_bitmap_copy_from_slot+0x2c/0x290 [md_mod 24ea..d3a]\nkernel: load_bitmaps+0xec/0x210 [md_cluster 77fe..7a0]\nkernel: md_bitmap_load+0x81/0x1e0 [md_mod 24ea..d3a]\nkernel: do_md_run+0x30/0x100 [md_mod 24ea..d3a]\nkernel: md_ioctl+0x1290/0x15a0 [md_mod 24ea....d3a]\nkernel: ? mddev_unlock+0xaa/0x130 [md_mod 24ea..d3a]\nkernel: ? blkdev_ioctl+0xb1/0x2b0\nkernel: block_ioctl+0x3b/0x40\nkernel: __x64_sys_ioctl+0x7f/0xb0\nkernel: do_syscall_64+0x59/0x80\nkernel: ? exit_to_user_mode_prepare+0x1ab/0x230\nkernel: ? syscall_exit_to_user_mode+0x18/0x40\nkernel: ? do_syscall_64+0x69/0x80\nkernel: entry_SYSCALL_64_after_hwframe+0x44/0xae\nkernel: RIP: 0033:0x7f4a15fa722b\nkernel: ... ...\nkernel: ---[ end trace 8afa7612f559c868 ]---\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]"}], "id": "CVE-2022-49526", "lastModified": "2025-02-26T07:01:28.593", "metrics": {}, "published": "2025-02-26T07:01:28.593", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0959aa00f9765bd8c654b1365012e41b51c733cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27f672af28a8e9b783ff7f0eaf7ef2fbd5a2f4ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/422e8f7ba1e08c8e0e88d375bcb550bc2bbfe96d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf9392282a2cf5a8d83dd1c5aa1a097e12f172bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d8f1558e1daf54f53a90b4c5700ae3e3a4b13412"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e68cb83a57a458b01c9739e2ad9cb70b04d1e6d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e69e93120f6219b9cc4fba3b515b6ababd8548aa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: md/bitmap: don't set sb values if can't pass sanity check", "id": "2347998", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347998"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmd/bitmap: don't set sb values if can't pass sanity check\nIf bitmap area contains invalid data, kernel will crash then mdadm\ntriggers \"Segmentation fault\".\nThis is cluster-md speical bug. In non-clustered env, mdadm will\nhandle broken metadata case. In clustered array, only kernel space\nhandles bitmap slot info. But even this bug only happened in clustered\nenv, current sanity check is wrong, the code should be changed.\nHow to trigger: (faulty injection)\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sda\ndd if=/dev/zero bs=1M count=1 oflag=direct of=/dev/sdb\nmdadm -C /dev/md0 -b clustered -e 1.2 -n 2 -l mirror /dev/sda /dev/sdb\nmdadm -Ss\necho aaa > magic.txt\n== below modifying slot 2 bitmap data ==\ndd if=magic.txt of=/dev/sda seek=16384 bs=1 count=3 <== destroy magic\ndd if=/dev/zero of=/dev/sda seek=16436 bs=1 count=4 <== ZERO chunksize\nmdadm -A /dev/md0 /dev/sda /dev/sdb\n== kernel crashes. mdadm outputs \"Segmentation fault\" ==\nReason of kernel crash:\nIn md_bitmap_read_sb (called by md_bitmap_create), bad bitmap magic didn't\nblock chunksize assignment, and zero value made DIV_ROUND_UP_SECTOR_T()\ntrigger \"divide error\".\nCrash log:\nkernel: md: md0 stopped.\nkernel: md/raid1:md0: not clean -- starting background reconstruction\nkernel: md/raid1:md0: active with 2 out of 2 mirrors\nkernel: dlm: ... ...\nkernel: md-cluster: Joined cluster 44810aba-38bb-e6b8-daca-bc97a0b254aa slot 1\nkernel: md0: invalid bitmap file superblock: bad magic\nkernel: md_bitmap_copy_from_slot can't get bitmap from slot 2\nkernel: md-cluster: Could not gather bitmaps from slot 2\nkernel: divide error: 0000 [#1] SMP NOPTI\nkernel: CPU: 0 PID: 1603 Comm: mdadm Not tainted 5.14.6-1-default\nkernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]\nkernel: RSP: 0018:ffffc22ac0843ba0 EFLAGS: 00010246\nkernel: ... ...\nkernel: Call Trace:\nkernel: ? dlm_lock_sync+0xd0/0xd0 [md_cluster 77fe..7a0]\nkernel: md_bitmap_copy_from_slot+0x2c/0x290 [md_mod 24ea..d3a]\nkernel: load_bitmaps+0xec/0x210 [md_cluster 77fe..7a0]\nkernel: md_bitmap_load+0x81/0x1e0 [md_mod 24ea..d3a]\nkernel: do_md_run+0x30/0x100 [md_mod 24ea..d3a]\nkernel: md_ioctl+0x1290/0x15a0 [md_mod 24ea....d3a]\nkernel: ? mddev_unlock+0xaa/0x130 [md_mod 24ea..d3a]\nkernel: ? blkdev_ioctl+0xb1/0x2b0\nkernel: block_ioctl+0x3b/0x40\nkernel: __x64_sys_ioctl+0x7f/0xb0\nkernel: do_syscall_64+0x59/0x80\nkernel: ? exit_to_user_mode_prepare+0x1ab/0x230\nkernel: ? syscall_exit_to_user_mode+0x18/0x40\nkernel: ? do_syscall_64+0x69/0x80\nkernel: entry_SYSCALL_64_after_hwframe+0x44/0xae\nkernel: RIP: 0033:0x7f4a15fa722b\nkernel: ... ...\nkernel: ---[ end trace 8afa7612f559c868 ]---\nkernel: RIP: 0010:md_bitmap_create+0x1d1/0x850 [md_mod]"], "name": "CVE-2022-49526", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49526\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49526\nhttps://lore.kernel.org/linux-cve-announce/2025022612-CVE-2022-49526-5b0b@gregkh/T"], "threat_severity": "Moderate"}