CVE-2025-40235 (GCVE-0-2025-40235)
Vulnerability from cvelistv5
Published
2025-12-04 15:31
Modified
2025-12-04 15:31
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()
If fs_info->super_copy or fs_info->super_for_commit allocated failed in
btrfs_get_tree_subvol(), then no need to call btrfs_free_fs_info().
Otherwise btrfs_check_leaked_roots() would access NULL pointer because
fs_info->allocated_roots had not been initialised.
syzkaller reported the following information:
------------[ cut here ]------------
BUG: unable to handle page fault for address: fffffffffffffbb0
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 64c9067 P4D 64c9067 PUD 64cb067 PMD 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 1402 Comm: syz.1.35 Not tainted 6.15.8 #4 PREEMPT(lazy)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), (...)
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:refcount_read include/linux/refcount.h:170 [inline]
RIP: 0010:btrfs_check_leaked_roots+0x18f/0x2c0 fs/btrfs/disk-io.c:1230
[...]
Call Trace:
<TASK>
btrfs_free_fs_info+0x310/0x410 fs/btrfs/disk-io.c:1280
btrfs_get_tree_subvol+0x592/0x6b0 fs/btrfs/super.c:2029
btrfs_get_tree+0x63/0x80 fs/btrfs/super.c:2097
vfs_get_tree+0x98/0x320 fs/super.c:1759
do_new_mount+0x357/0x660 fs/namespace.c:3899
path_mount+0x716/0x19c0 fs/namespace.c:4226
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount fs/namespace.c:4427 [inline]
__x64_sys_mount+0x28c/0x310 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x92/0x180 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f032eaffa8d
[...]
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/btrfs/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b1c2b4e6ffd307720ab6ce42f6749b0c02ba0a73",
"status": "affected",
"version": "3bb17a25bcb09abbd667c6ac86c7c9109ae82bcd",
"versionType": "git"
},
{
"lessThan": "0c2b2d4d053e9840e6da6ed581befa20309f281a",
"status": "affected",
"version": "3bb17a25bcb09abbd667c6ac86c7c9109ae82bcd",
"versionType": "git"
},
{
"lessThan": "17679ac6df6c4830ba711835aa8cf961be36cfa1",
"status": "affected",
"version": "3bb17a25bcb09abbd667c6ac86c7c9109ae82bcd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/btrfs/super.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"lessThan": "6.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.56",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.56",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.6",
"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "6.8",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()\n\nIf fs_info-\u003esuper_copy or fs_info-\u003esuper_for_commit allocated failed in\nbtrfs_get_tree_subvol(), then no need to call btrfs_free_fs_info().\nOtherwise btrfs_check_leaked_roots() would access NULL pointer because\nfs_info-\u003eallocated_roots had not been initialised.\n\nsyzkaller reported the following information:\n ------------[ cut here ]------------\n BUG: unable to handle page fault for address: fffffffffffffbb0\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 64c9067 P4D 64c9067 PUD 64cb067 PMD 0\n Oops: Oops: 0000 [#1] SMP KASAN PTI\n CPU: 0 UID: 0 PID: 1402 Comm: syz.1.35 Not tainted 6.15.8 #4 PREEMPT(lazy)\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), (...)\n RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]\n RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]\n RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]\n RIP: 0010:refcount_read include/linux/refcount.h:170 [inline]\n RIP: 0010:btrfs_check_leaked_roots+0x18f/0x2c0 fs/btrfs/disk-io.c:1230\n [...]\n Call Trace:\n \u003cTASK\u003e\n btrfs_free_fs_info+0x310/0x410 fs/btrfs/disk-io.c:1280\n btrfs_get_tree_subvol+0x592/0x6b0 fs/btrfs/super.c:2029\n btrfs_get_tree+0x63/0x80 fs/btrfs/super.c:2097\n vfs_get_tree+0x98/0x320 fs/super.c:1759\n do_new_mount+0x357/0x660 fs/namespace.c:3899\n path_mount+0x716/0x19c0 fs/namespace.c:4226\n do_mount fs/namespace.c:4239 [inline]\n __do_sys_mount fs/namespace.c:4450 [inline]\n __se_sys_mount fs/namespace.c:4427 [inline]\n __x64_sys_mount+0x28c/0x310 fs/namespace.c:4427\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x92/0x180 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f032eaffa8d\n [...]"
}
],
"providerMetadata": {
"dateUpdated": "2025-12-04T15:31:25.785Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b1c2b4e6ffd307720ab6ce42f6749b0c02ba0a73"
},
{
"url": "https://git.kernel.org/stable/c/0c2b2d4d053e9840e6da6ed581befa20309f281a"
},
{
"url": "https://git.kernel.org/stable/c/17679ac6df6c4830ba711835aa8cf961be36cfa1"
}
],
"title": "btrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40235",
"datePublished": "2025-12-04T15:31:25.785Z",
"dateReserved": "2025-04-16T07:20:57.180Z",
"dateUpdated": "2025-12-04T15:31:25.785Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-40235\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:16.407\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: directly free partially initialized fs_info in btrfs_check_leaked_roots()\\n\\nIf fs_info-\u003esuper_copy or fs_info-\u003esuper_for_commit allocated failed in\\nbtrfs_get_tree_subvol(), then no need to call btrfs_free_fs_info().\\nOtherwise btrfs_check_leaked_roots() would access NULL pointer because\\nfs_info-\u003eallocated_roots had not been initialised.\\n\\nsyzkaller reported the following information:\\n ------------[ cut here ]------------\\n BUG: unable to handle page fault for address: fffffffffffffbb0\\n #PF: supervisor read access in kernel mode\\n #PF: error_code(0x0000) - not-present page\\n PGD 64c9067 P4D 64c9067 PUD 64cb067 PMD 0\\n Oops: Oops: 0000 [#1] SMP KASAN PTI\\n CPU: 0 UID: 0 PID: 1402 Comm: syz.1.35 Not tainted 6.15.8 #4 PREEMPT(lazy)\\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), (...)\\n RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]\\n RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]\\n RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]\\n RIP: 0010:refcount_read include/linux/refcount.h:170 [inline]\\n RIP: 0010:btrfs_check_leaked_roots+0x18f/0x2c0 fs/btrfs/disk-io.c:1230\\n [...]\\n Call Trace:\\n \u003cTASK\u003e\\n btrfs_free_fs_info+0x310/0x410 fs/btrfs/disk-io.c:1280\\n btrfs_get_tree_subvol+0x592/0x6b0 fs/btrfs/super.c:2029\\n btrfs_get_tree+0x63/0x80 fs/btrfs/super.c:2097\\n vfs_get_tree+0x98/0x320 fs/super.c:1759\\n do_new_mount+0x357/0x660 fs/namespace.c:3899\\n path_mount+0x716/0x19c0 fs/namespace.c:4226\\n do_mount fs/namespace.c:4239 [inline]\\n __do_sys_mount fs/namespace.c:4450 [inline]\\n __se_sys_mount fs/namespace.c:4427 [inline]\\n __x64_sys_mount+0x28c/0x310 fs/namespace.c:4427\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0x92/0x180 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n RIP: 0033:0x7f032eaffa8d\\n [...]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c2b2d4d053e9840e6da6ed581befa20309f281a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/17679ac6df6c4830ba711835aa8cf961be36cfa1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1c2b4e6ffd307720ab6ce42f6749b0c02ba0a73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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