CVE-2026-74330 (GCVE-0-2026-74330)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-08-17 05:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
configfs: fix lockless traversals of ->s_children
Having the parent directory locked protects entries from removal
by another thread, but it does *not* protect cursors from being
moved around by lseek() - or freed, for that matter.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 Version: 6f61076406251626be39651d114fac412b1e0c39 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "6f61076406251626be39651d114fac412b1e0c39",
"versionType": "git"
},
{
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"status": "affected",
"version": "6f61076406251626be39651d114fac412b1e0c39",
"versionType": "git"
},
{
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"status": "affected",
"version": "6f61076406251626be39651d114fac412b1e0c39",
"versionType": "git"
},
{
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"version": "6f61076406251626be39651d114fac412b1e0c39",
"versionType": "git"
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{
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},
{
"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": "2.6.27"
},
{
"lessThan": "2.6.27",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "2.6.27",
"vulnerable": true
},
{
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"versionEndExcluding": "5.15.212",
"versionStartIncluding": "2.6.27",
"vulnerable": true
},
{
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"vulnerable": true
},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
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},
{
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{
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix lockless traversals of -\u003es_children\n\nHaving the parent directory locked protects entries from removal\nby another thread, but it does *not* protect cursors from being\nmoved around by lseek() - or freed, for that matter."
}
],
"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 bug is reached only through local VFS syscalls (openat, getdents, lseek, close, mkdir, rmdir) against configfs, typically mounted at /sys/kernel/config; it is not reachable via network-facing kernel services such as ksmbd, nfsd, or packet-receive paths.\nAC:L - The attacker controls both sides of the race: opening a configfs directory inserts a readdir cursor into s_children, and concurrent lseek() or close() moves or frees that cursor while detach_attrs, detach_groups, or configfs_find_subsys_dentry traverse the list without configfs_dirent_lock; the window is attacker-driven and retryable.\nPR:L - Default configfs trees are root-owned, but 0755 directories let any local user open and lseek while teardown races proceed; USB gadget, target/LIO, gpio-aggregator, and embedded deployments commonly grant configfs mkdir/rmdir/write to service accounts or expose world-writable (S_IWUGO) gadget attributes.\nUI:N - Exploitation requires only the attacker issuing syscalls and spawning concurrent threads against configfs paths mounted at boot; no victim must mount filesystems, click prompts, or open files on the attacker\u0027s behalf.\nS:U - Slab use-after-free and list corruption impact kernel memory within the same security domain; this enables local privilege escalation, not VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Lockless s_children traversal can follow a freed readdir cursor (the fix commit notes cursors can be \"freed\"), dereferencing kmem_cache_freed configfs_dirent objects and yielding standard slab UAF read primitives over adjacent kernel heap contents.\nI:H - The dangling cursor and list corruption enable heap grooming to reclaim freed configfs_dirent slabs and convert the race into arbitrary kernel writes or control-flow hijack, not merely incorrect metadata updates.\nA:H - Concurrent cursor free or move during unlocked list iteration causes kernel oops or panic via invalid list pointers or UAF dereferences; the race is repeatable for sustained denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:45:56.848Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/77fd6f50f633a52c2db061e7d71d8cb486b0265e"
},
{
"url": "https://git.kernel.org/stable/c/91f289728ec706b7ff1ca0ee845dd73ff2253488"
},
{
"url": "https://git.kernel.org/stable/c/b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb"
},
{
"url": "https://git.kernel.org/stable/c/9e57e2863872e82e7c7237bc32299f67ebebc543"
},
{
"url": "https://git.kernel.org/stable/c/459860529c109c5ce08b81c0776ca1200eaaeb4a"
},
{
"url": "https://git.kernel.org/stable/c/637ef4961470e04455102b34ac484a34d8eca0a4"
},
{
"url": "https://git.kernel.org/stable/c/e6d93108e0a27d7e6f95c7e45017d14ba2900d32"
},
{
"url": "https://git.kernel.org/stable/c/9b9e8bb81c41fd27e7b57a1c936fde140548535f"
}
],
"title": "configfs: fix lockless traversals of -\u003es_children",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74330",
"datePublished": "2026-08-15T05:58:23.722Z",
"dateReserved": "2026-08-15T05:44:03.885Z",
"dateUpdated": "2026-08-17T05:45:56.848Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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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