{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74330", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.885Z", "datePublished": "2026-08-15T05:58:23.722Z", "dateUpdated": "2026-08-17T05:45:56.848Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:56.848Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: fix lockless traversals of ->s_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": { "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" }, "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's 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/configfs/dir.c" ], "versions": [ { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "77fd6f50f633a52c2db061e7d71d8cb486b0265e", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "91f289728ec706b7ff1ca0ee845dd73ff2253488", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "9e57e2863872e82e7c7237bc32299f67ebebc543", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "459860529c109c5ce08b81c0776ca1200eaaeb4a", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "637ef4961470e04455102b34ac484a34d8eca0a4", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "e6d93108e0a27d7e6f95c7e45017d14ba2900d32", "status": "affected", "versionType": "git" }, { "version": "6f61076406251626be39651d114fac412b1e0c39", "lessThan": "9b9e8bb81c41fd27e7b57a1c936fde140548535f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/configfs/dir.c" ], "versions": [ { "version": "2.6.27", "status": "affected" }, { "version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.2" } ] } ] } ], "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 ->s_children", "x_generator": { "engine": "bippy-1.2.0" } } } }