{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-35867", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.107Z", "datePublished": "2024-05-19T08:34:25.911Z", "dateUpdated": "2026-08-05T11:30:30.460Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:30.460Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF in cifs_stats_proc_show()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF." } ], "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 vulnerable code is reached only through a local `read()` on `/proc/fs/cifs/Stats`; no remote peer input drives the vulnerable traversal. The race partner (SMB session teardown) is local mount/umount or per-uid session teardown activity.\nAC:L - The attacker controls both sides — an unprivileged read loop on the world-readable proc file, plus session teardown they can force repeatedly on multiuser/autofs CIFS mounts — and `__cifs_put_smb_ses()` holds the SES_EXITING window open across a blocking SMB LOGOFF round-trip, making the window wide and reliably hit.\nPR:L - `/proc/fs/cifs/Stats` is created mode 0644 in the global, non-namespaced procfs, so any unprivileged local user — including one inside a container with `/proc` mounted — can trigger the vulnerable read path. No capability, and no CIFS mount ownership, is required.\nUI:N - No victim action is needed: the attacker's own access to a multiuser mount creates and tears down per-fsuid SMB sessions, and ordinary background CIFS mount/reconnect/prune activity supplies the teardown otherwise.\nS:U - The use-after-free occurs in kernel memory and its effects stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Contents of the freed `cifs_tcon` — including `tree_name` printed with `%s`, which reads until a NUL and can run past the freed object — are copied into the seq_file buffer returned to the unprivileged reader, yielding a kernel heap disclosure that can be aimed at reallocated sensitive data via heap grooming.\nI:H - A use-after-free of this class gives the attacker influence over the freed slab object's contents, letting dereferenced pointers (`server->ops->print_stats`, tcon list links) be steered by heap spraying into a control-flow/corruption primitive rather than a mere stale read.\nA:H - The confirmed sibling bug produced a general protection fault on slab poison in exactly this traversal, and the oops happens while the global `cifs_tcp_ses_lock` spinlock is held, hanging all subsequent CIFS operations system-wide on top of killing the faulting task." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/cifs_debug.c" ], "versions": [ { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "838ec01ea8d3deb5d123e8ed9022e8162dc3f503", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "bb6570085826291dc392005f9fec16ea5da3c8ad", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "16b7d785775eb03929766819415055e367398f49", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "c3cf8b74c57924c0985e49a1fdf02d3395111f39", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "1e12f0d5c66f07c934041621351973a116fa13c7", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "0865ffefea197b437ba78b5dd8d8e256253efd65", "status": "affected", "versionType": "git" }, { "version": "a67172a013953664b1dad03c648200c70b90506c", "status": "affected", "versionType": "git" }, { "version": "3.12.48", "lessThan": "3.13", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/cifs_debug.c" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.237", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.181", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "3.13", "versionEndExcluding": "5.10.237" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.48" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/838ec01ea8d3deb5d123e8ed9022e8162dc3f503" }, { "url": "https://git.kernel.org/stable/c/bb6570085826291dc392005f9fec16ea5da3c8ad" }, { "url": "https://git.kernel.org/stable/c/16b7d785775eb03929766819415055e367398f49" }, { "url": "https://git.kernel.org/stable/c/c3cf8b74c57924c0985e49a1fdf02d3395111f39" }, { "url": "https://git.kernel.org/stable/c/1e12f0d5c66f07c934041621351973a116fa13c7" }, { "url": "https://git.kernel.org/stable/c/0865ffefea197b437ba78b5dd8d8e256253efd65" } ], "title": "smb: client: fix potential UAF in cifs_stats_proc_show()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/16b7d785775eb03929766819415055e367398f49", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c3cf8b74c57924c0985e49a1fdf02d3395111f39", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1e12f0d5c66f07c934041621351973a116fa13c7", "tags": [ "x_transferred" ] }, { "url": 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