CVE-2023-54127 (GCVE-0-2023-54127)
Vulnerability from cvelistv5 – Published: 2025-12-24 13:06 – Updated: 2026-08-05 09:17
VLAI
EPSS
VEX
Title
fs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()
Summary
In the Linux kernel, the following vulnerability has been resolved:
fs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()
Syzkaller reported the following issue:
==================================================================
BUG: KASAN: double-free in slab_free mm/slub.c:3787 [inline]
BUG: KASAN: double-free in __kmem_cache_free+0x71/0x110 mm/slub.c:3800
Free of addr ffff888086408000 by task syz-executor.4/12750
[...]
Call Trace:
<TASK>
[...]
kasan_report_invalid_free+0xac/0xd0 mm/kasan/report.c:482
____kasan_slab_free+0xfb/0x120
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
__kmem_cache_free+0x71/0x110 mm/slub.c:3800
dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264
jfs_umount+0x248/0x3b0 fs/jfs/jfs_umount.c:87
jfs_put_super+0x86/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x130/0x310 fs/super.c:492
kill_block_super+0x79/0xd0 fs/super.c:1386
deactivate_locked_super+0xa7/0xf0 fs/super.c:332
cleanup_mnt+0x494/0x520 fs/namespace.c:1291
task_work_run+0x243/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
[...]
</TASK>
Allocated by task 13352:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:580 [inline]
dbMount+0x54/0x980 fs/jfs/jfs_dmap.c:164
jfs_mount+0x1dd/0x830 fs/jfs/jfs_mount.c:121
jfs_fill_super+0x590/0xc50 fs/jfs/super.c:556
mount_bdev+0x26c/0x3a0 fs/super.c:1359
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1489
do_new_mount+0x289/0xad0 fs/namespace.c:3145
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 13352:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518
____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
__kmem_cache_free+0x71/0x110 mm/slub.c:3800
dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264
jfs_mount_rw+0x545/0x740 fs/jfs/jfs_mount.c:247
jfs_remount+0x3db/0x710 fs/jfs/super.c:454
reconfigure_super+0x3bc/0x7b0 fs/super.c:935
vfs_fsconfig_locked fs/fsopen.c:254 [inline]
__do_sys_fsconfig fs/fsopen.c:439 [inline]
__se_sys_fsconfig+0xad5/0x1060 fs/fsopen.c:314
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
[...]
JFS_SBI(ipbmap->i_sb)->bmap wasn't set to NULL after kfree() in
dbUnmount().
Syzkaller uses faultinject to reproduce this KASAN double-free
warning. The issue is triggered if either diMount() or dbMount() fail
in jfs_remount(), since diUnmount() or dbUnmount() already happened in
such a case - they will do double-free on next execution: jfs_umount
or jfs_remount.
Tested on both upstream and jfs-next by syzkaller.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 798c5f6f98bc9045593d4b3a65c32f05d97bd0e6
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aef6507e85475e30831c30405d785c7ed976ea4a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b12ccbfdf6539ef0157868f69fcae0b7f7a072b3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2f7a36448f51d08d3a83f1514abcca4b680bcd3c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cade5397e5461295f3cb87880534b6a07cafa427 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 4.14.326 , ≤ 4.14.* (semver) Unaffected: 4.19.295 , ≤ 4.19.* (semver) Unaffected: 5.4.257 , ≤ 5.4.* (semver) Unaffected: 5.10.197 , ≤ 5.10.* (semver) Unaffected: 5.15.133 , ≤ 5.15.* (semver) Unaffected: 6.1.55 , ≤ 6.1.* (semver) Unaffected: 6.5.5 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/jfs/jfs_dmap.c"
],
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{
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"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
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"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "cade5397e5461295f3cb87880534b6a07cafa427",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"lessThan": "2.6.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.326",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.295",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.257",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.197",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.133",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.55",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.5.*",
"status": "unaffected",
"version": "6.5.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.326",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.295",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.257",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.197",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.133",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.55",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.5.5",
"versionStartIncluding": "2.6.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6",
"versionStartIncluding": "2.6.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()\n\nSyzkaller reported the following issue:\n==================================================================\nBUG: KASAN: double-free in slab_free mm/slub.c:3787 [inline]\nBUG: KASAN: double-free in __kmem_cache_free+0x71/0x110 mm/slub.c:3800\nFree of addr ffff888086408000 by task syz-executor.4/12750\n[...]\nCall Trace:\n \u003cTASK\u003e\n[...]\n kasan_report_invalid_free+0xac/0xd0 mm/kasan/report.c:482\n ____kasan_slab_free+0xfb/0x120\n kasan_slab_free include/linux/kasan.h:177 [inline]\n slab_free_hook mm/slub.c:1781 [inline]\n slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807\n slab_free mm/slub.c:3787 [inline]\n __kmem_cache_free+0x71/0x110 mm/slub.c:3800\n dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264\n jfs_umount+0x248/0x3b0 fs/jfs/jfs_umount.c:87\n jfs_put_super+0x86/0x190 fs/jfs/super.c:194\n generic_shutdown_super+0x130/0x310 fs/super.c:492\n kill_block_super+0x79/0xd0 fs/super.c:1386\n deactivate_locked_super+0xa7/0xf0 fs/super.c:332\n cleanup_mnt+0x494/0x520 fs/namespace.c:1291\n task_work_run+0x243/0x300 kernel/task_work.c:179\n resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]\n exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171\n exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296\n do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[...]\n \u003c/TASK\u003e\n\nAllocated by task 13352:\n kasan_save_stack mm/kasan/common.c:45 [inline]\n kasan_set_track+0x3d/0x60 mm/kasan/common.c:52\n ____kasan_kmalloc mm/kasan/common.c:371 [inline]\n __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380\n kmalloc include/linux/slab.h:580 [inline]\n dbMount+0x54/0x980 fs/jfs/jfs_dmap.c:164\n jfs_mount+0x1dd/0x830 fs/jfs/jfs_mount.c:121\n jfs_fill_super+0x590/0xc50 fs/jfs/super.c:556\n mount_bdev+0x26c/0x3a0 fs/super.c:1359\n legacy_get_tree+0xea/0x180 fs/fs_context.c:610\n vfs_get_tree+0x88/0x270 fs/super.c:1489\n do_new_mount+0x289/0xad0 fs/namespace.c:3145\n do_mount fs/namespace.c:3488 [inline]\n __do_sys_mount fs/namespace.c:3697 [inline]\n __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFreed by task 13352:\n kasan_save_stack mm/kasan/common.c:45 [inline]\n kasan_set_track+0x3d/0x60 mm/kasan/common.c:52\n kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518\n ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236\n kasan_slab_free include/linux/kasan.h:177 [inline]\n slab_free_hook mm/slub.c:1781 [inline]\n slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807\n slab_free mm/slub.c:3787 [inline]\n __kmem_cache_free+0x71/0x110 mm/slub.c:3800\n dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264\n jfs_mount_rw+0x545/0x740 fs/jfs/jfs_mount.c:247\n jfs_remount+0x3db/0x710 fs/jfs/super.c:454\n reconfigure_super+0x3bc/0x7b0 fs/super.c:935\n vfs_fsconfig_locked fs/fsopen.c:254 [inline]\n __do_sys_fsconfig fs/fsopen.c:439 [inline]\n __se_sys_fsconfig+0xad5/0x1060 fs/fsopen.c:314\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[...]\n\nJFS_SBI(ipbmap-\u003ei_sb)-\u003ebmap wasn\u0027t set to NULL after kfree() in\ndbUnmount().\n\nSyzkaller uses faultinject to reproduce this KASAN double-free\nwarning. The issue is triggered if either diMount() or dbMount() fail\nin jfs_remount(), since diUnmount() or dbUnmount() already happened in\nsuch a case - they will do double-free on next execution: jfs_umount\nor jfs_remount.\n\nTested on both upstream and jfs-next by syzkaller."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is reached only through local filesystem syscalls \u2014 mount(2)/fsconfig(2) remount of a JFS block device followed by umount \u2014 with an attacker-supplied or attacker-modifiable image on removable/loop media. No network or adjacent-network path exists into JFS mount handling.\nAC:L - The attacker deterministically forces dbMount() to fail on the remount re-read, because jfs_mount_rw() calls truncate_inode_pages() on ipbmap first: mutating the backing store so the bmap descriptor fails the sanity checks yields -EINVAL, and truncating it yields -EIO from read_metapage(). No race and no condition outside the attacker\u0027s control is involved.\nPR:L - Untrusted JFS media is routinely mounted and remounted on behalf of unprivileged users on kiosks, embedded/automotive and Android-class devices via udisks/autofs and mount-ro-then-remount-rw boot flows, and semi-privileged container/service contexts can drive the same path; consistent with sibling JFS crafted-image CVEs, a low-privileged local actor is assumed rather than full init-namespace root.\nUI:N - The attacker drives the whole sequence \u2014 mount read-only, remount read-write with a poisoned/erroring backing store, then unmount \u2014 with no victim action required at any step.\nS:U - The freed struct bmap, the slab it lives in, and all corrupted state belong to the kernel\u0027s own memory-management authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Before the second kfree(), dbSync() reads the already-freed bmap and writes over a kilobyte of its contents \u2014 including all 128 db_agfree[] entries \u2014 into the on-disk bmap descriptor, which the attacker reads back from the device, leaking freed kernel heap memory; the double-free itself further yields arbitrary read via overlapping allocations.\nI:H - A double-free of a ~1.6 KiB object in the sprayable kmalloc-2k cache lets the attacker reclaim it and hand two owners the same allocation, a classic type-confusion path to arbitrary kernel write; additionally, since jfs_remount() clears SB_RDONLY even on failure, dbAlloc()/dbFree() subsequently write through the dangling bmap pointer.\nA:H - The bug was reported by syzbot as a KASAN double-free that corrupts SLUB freelist state; with freelist hardening or slub_debug this is an immediate kernel panic, and unchecked it produces allocator corruption and crashes."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:17:27.521Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/798c5f6f98bc9045593d4b3a65c32f05d97bd0e6"
},
{
"url": "https://git.kernel.org/stable/c/aef6507e85475e30831c30405d785c7ed976ea4a"
},
{
"url": "https://git.kernel.org/stable/c/b12ccbfdf6539ef0157868f69fcae0b7f7a072b3"
},
{
"url": "https://git.kernel.org/stable/c/6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27"
},
{
"url": "https://git.kernel.org/stable/c/aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b"
},
{
"url": "https://git.kernel.org/stable/c/2f7a36448f51d08d3a83f1514abcca4b680bcd3c"
},
{
"url": "https://git.kernel.org/stable/c/f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f"
},
{
"url": "https://git.kernel.org/stable/c/cade5397e5461295f3cb87880534b6a07cafa427"
}
],
"title": "fs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-54127",
"datePublished": "2025-12-24T13:06:45.380Z",
"dateReserved": "2025-12-24T13:02:52.521Z",
"dateUpdated": "2026-08-05T09:17:27.521Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2023-54127",
"date": "2026-09-15",
"epss": "0.00158",
"percentile": "0.0531"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2023-54127\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:14.680\",\"lastModified\":\"2026-08-04T10:19:30.343\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()\\n\\nSyzkaller reported the following issue:\\n==================================================================\\nBUG: KASAN: double-free in slab_free mm/slub.c:3787 [inline]\\nBUG: KASAN: double-free in __kmem_cache_free+0x71/0x110 mm/slub.c:3800\\nFree of addr ffff888086408000 by task syz-executor.4/12750\\n[...]\\nCall Trace:\\n \u003cTASK\u003e\\n[...]\\n kasan_report_invalid_free+0xac/0xd0 mm/kasan/report.c:482\\n ____kasan_slab_free+0xfb/0x120\\n kasan_slab_free include/linux/kasan.h:177 [inline]\\n slab_free_hook mm/slub.c:1781 [inline]\\n slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807\\n slab_free mm/slub.c:3787 [inline]\\n __kmem_cache_free+0x71/0x110 mm/slub.c:3800\\n dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264\\n jfs_umount+0x248/0x3b0 fs/jfs/jfs_umount.c:87\\n jfs_put_super+0x86/0x190 fs/jfs/super.c:194\\n generic_shutdown_super+0x130/0x310 fs/super.c:492\\n kill_block_super+0x79/0xd0 fs/super.c:1386\\n deactivate_locked_super+0xa7/0xf0 fs/super.c:332\\n cleanup_mnt+0x494/0x520 fs/namespace.c:1291\\n task_work_run+0x243/0x300 kernel/task_work.c:179\\n resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]\\n exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171\\n exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203\\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\\n syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296\\n do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n[...]\\n \u003c/TASK\u003e\\n\\nAllocated by task 13352:\\n kasan_save_stack mm/kasan/common.c:45 [inline]\\n kasan_set_track+0x3d/0x60 mm/kasan/common.c:52\\n ____kasan_kmalloc mm/kasan/common.c:371 [inline]\\n __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380\\n kmalloc include/linux/slab.h:580 [inline]\\n dbMount+0x54/0x980 fs/jfs/jfs_dmap.c:164\\n jfs_mount+0x1dd/0x830 fs/jfs/jfs_mount.c:121\\n jfs_fill_super+0x590/0xc50 fs/jfs/super.c:556\\n mount_bdev+0x26c/0x3a0 fs/super.c:1359\\n legacy_get_tree+0xea/0x180 fs/fs_context.c:610\\n vfs_get_tree+0x88/0x270 fs/super.c:1489\\n do_new_mount+0x289/0xad0 fs/namespace.c:3145\\n do_mount fs/namespace.c:3488 [inline]\\n __do_sys_mount fs/namespace.c:3697 [inline]\\n __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nFreed by task 13352:\\n kasan_save_stack mm/kasan/common.c:45 [inline]\\n kasan_set_track+0x3d/0x60 mm/kasan/common.c:52\\n kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518\\n ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236\\n kasan_slab_free include/linux/kasan.h:177 [inline]\\n slab_free_hook mm/slub.c:1781 [inline]\\n slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807\\n slab_free mm/slub.c:3787 [inline]\\n __kmem_cache_free+0x71/0x110 mm/slub.c:3800\\n dbUnmount+0xf4/0x110 fs/jfs/jfs_dmap.c:264\\n jfs_mount_rw+0x545/0x740 fs/jfs/jfs_mount.c:247\\n jfs_remount+0x3db/0x710 fs/jfs/super.c:454\\n reconfigure_super+0x3bc/0x7b0 fs/super.c:935\\n vfs_fsconfig_locked fs/fsopen.c:254 [inline]\\n __do_sys_fsconfig fs/fsopen.c:439 [inline]\\n __se_sys_fsconfig+0xad5/0x1060 fs/fsopen.c:314\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n[...]\\n\\nJFS_SBI(ipbmap-\u003ei_sb)-\u003ebmap wasn\u0027t set to NULL after kfree() in\\ndbUnmount().\\n\\nSyzkaller uses faultinject to reproduce this KASAN double-free\\nwarning. The issue is triggered if either diMount() or dbMount() fail\\nin jfs_remount(), since diUnmount() or dbUnmount() already happened in\\nsuch a case - they will do double-free on next execution: jfs_umount\\nor jfs_remount.\\n\\nTested on both upstream and jfs-next by syzkaller.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/jfs/jfs_dmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"798c5f6f98bc9045593d4b3a65c32f05d97bd0e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"aef6507e85475e30831c30405d785c7ed976ea4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b12ccbfdf6539ef0157868f69fcae0b7f7a072b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2f7a36448f51d08d3a83f1514abcca4b680bcd3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"cade5397e5461295f3cb87880534b6a07cafa427\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/jfs/jfs_dmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.326\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.295\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.257\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.197\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.133\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.55\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5.5\",\"lessThanOrEqual\":\"6.5.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2f7a36448f51d08d3a83f1514abcca4b680bcd3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/798c5f6f98bc9045593d4b3a65c32f05d97bd0e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aef6507e85475e30831c30405d785c7ed976ea4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b12ccbfdf6539ef0157868f69fcae0b7f7a072b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cade5397e5461295f3cb87880534b6a07cafa427\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-04T22:53:23+00:00",
"cve": "CVE-2023-54127",
"id": "CVE-2023-54127",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: fs/jfs: prevent double-free in dbUnmount() after failed jfs_remount()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54127.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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