{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89497", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.714Z", "datePublished": "2026-09-11T19:43:47.439Z", "dateUpdated": "2026-10-19T08:47:48.916Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:47:48.916Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: skip leading spaces before parsing client debug masks\n\norangefs_prepare_cdm_array() sizes each client debug keyword buffer\nwith strcspn(cds_head, \" \"), but then parses the keyword with %s. The\n%s conversion skips leading whitespace, while strcspn() does not.\n\nIf a client debug entry starts with a space, the allocation can be sized\nfor an empty keyword while sscanf() copies the following non-empty token.\nThis can write past the end of the allocated keyword buffer.\n\nSkip leading spaces before computing the keyword length so the allocation\nmatches the string parsed by sscanf()." } ], "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 overflow is reached only via ioctl(ORANGEFS_DEV_CLIENT_STRING) on /dev/pvfs2-req after orangefs_devreq_open(); orangefs_debugfs_new_client_string() copy_from_user()s the client debug-mask table from that local fd into orangefs_prepare_cdm_array(). Unlike readdir trailers, this string is not supplied by an OrangeFS server over the network.\nAC:L - A single CLIENT_STRING ioctl whose first newline-delimited entry begins with spaces then a long non-whitespace token deterministically makes strcspn() return 0 while sscanf(\"%s\") copies that token; the attacker fully controls the 2048-byte buffer and needs no race, heap layout, or other state outside their control.\nPR:L - orangefs_devreq_open() checks only init_user_ns, O_NONBLOCK, and exclusive open—no capability. The kernel documents mknod /dev/pvfs2-req, which is typically world-readable, and ioctl works on O_RDONLY, so an unprivileged local user can open the node when client-core is not holding it; user namespaces cannot open it, but init-ns DAC is enough.\nUI:N - The attacker opens /dev/pvfs2-req and issues the crafted CLIENT_STRING ioctl themselves. No victim must mount OrangeFS, start pvfs2-client-core, or otherwise interact; an already-loaded module and device node are deployment state, not user interaction.\nS:U - The heap overflow and any resulting kernel memory corruption or oops occur in the same kernel that services the ioctl. This is a standard local kernel compromise, not a VM/IOMMU/sandbox boundary crossing.\nC:H - sscanf(\"%s\") with no field width copies an attacker-chosen token (up to the 2048-byte ioctl buffer) into a kzalloc(1) keyword, a large heap overflow that can overwrite adjacent slab objects and pointers, yielding an arbitrary read primitive per CNA memory-corruption guidance.\nI:H - The same unbounded out-of-bounds write smashes heap metadata and neighboring objects with attacker-controlled bytes, which is sufficient for arbitrary write and control-flow hijack; CNA guidance rates heap buffer overflows High for integrity.\nA:H - Overflowing a 1-byte slab allocation by up to ~2KB of attacker data reliably corrupts the heap and can oops/panic the kernel even without a full exploit, so availability impact is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/orangefs/orangefs-debugfs.c" ], "versions": [ { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "173bfd69696815bcf1c052f61cb69c26cca4e443", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "995f4d05589f87452a56672270af28918c8939c3", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "0ef38d53bca5ea1375fea0d3d11e9727df064b85", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "ce748ae1181d0daf5dd0d2d906d5c1cc328c153b", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "15d79c806231e62a7b746d3b42626810004e1b27", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "116d14f29a0524853c9316f32a2ac06cff5d4bf6", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "1774c5b3713add32fe15ab0d3db4b73355f94e35", "status": "affected", "versionType": "git" }, { "version": "f7be4ee07fb72a516563bc2870ef41fa589a964a", "lessThan": "d410cd5303ec59c7cf23dd61423752ce8e9ecb59", "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/orangefs/orangefs-debugfs.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.6", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/173bfd69696815bcf1c052f61cb69c26cca4e443" }, { "url": "https://git.kernel.org/stable/c/995f4d05589f87452a56672270af28918c8939c3" }, { "url": "https://git.kernel.org/stable/c/0ef38d53bca5ea1375fea0d3d11e9727df064b85" }, { "url": "https://git.kernel.org/stable/c/ce748ae1181d0daf5dd0d2d906d5c1cc328c153b" }, { "url": "https://git.kernel.org/stable/c/15d79c806231e62a7b746d3b42626810004e1b27" }, { "url": "https://git.kernel.org/stable/c/116d14f29a0524853c9316f32a2ac06cff5d4bf6" }, { "url": "https://git.kernel.org/stable/c/1774c5b3713add32fe15ab0d3db4b73355f94e35" }, { "url": "https://git.kernel.org/stable/c/d410cd5303ec59c7cf23dd61423752ce8e9ecb59" } ], "title": "orangefs: skip leading spaces before parsing client debug masks", "x_generator": { "engine": "bippy-1.2.0" } } } }