{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40306", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.185Z", "datePublished": "2025-12-08T00:46:31.514Z", "dateUpdated": "2026-08-05T12:09:24.767Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:24.767Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau forwarded me a message from\nDisclosure with the following\nwarning:\n\n> The helper `xattr_key()` uses the pointer variable in the loop condition\n> rather than dereferencing it. As `key` is incremented, it remains non-NULL\n> (until it runs into unmapped memory), so the loop does not terminate on\n> valid C strings and will walk memory indefinitely, consuming CPU or hanging\n> the thread.\n\nI easily reproduced this with setfattr and getfattr, causing a kernel\noops, hung user processes and corrupted orangefs files. Disclosure\nsent along a diff (not a patch) with a suggested fix, which I based\nthis patch on.\n\nAfter xattr_key started working right, xfstest generic/069 exposed an\nxattr related memory leak that lead to OOM. xattr_key returns\na hashed key. When adding xattrs to the orangefs xattr cache, orangefs\nused hash_add, a kernel hashing macro. hash_add also hashes the key using\nhash_log which resulted in additions to the xattr cache going to the wrong\nhash bucket. generic/069 tortures a single file and orangefs does a\ngetattr for the xattr \"security.capability\" every time. Orangefs\nnegative caches on xattrs which includes a kmalloc. Since adds to the\nxattr cache were going to the wrong bucket, every getattr for\n\"security.capability\" resulted in another kmalloc, none of which were\never freed.\n\nI changed the two uses of hash_add to hlist_add_head instead\nand the memory leak ceased and generic/069 quit throwing furniture." } ], "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 `xattr_key()` is reached only through local syscalls (getxattr/setxattr/removexattr, or implicit ACL and `security.capability` lookups) on a mounted OrangeFS filesystem. The xattr keys originate from local userspace or kernel .rodata, never from the OrangeFS server's network responses.\nAC:L - A single `getfattr`/`setfattr` on any file of an OrangeFS mount deterministically triggers the runaway loop; the maintainer reported reproducing it \"easily\". No race, no memory-layout precondition, and the guard-page fault on the kernel stack makes the oops essentially guaranteed.\nPR:L - Any unprivileged local user with read access to a file on the mount can trigger it; `xattr_permission()` only requires MAY_READ for the user.* namespace, and the `.prefix = \"\"` handler matches every name. The ACL/`security.capability` paths fire during ordinary permission checks and execve, needing no explicit privilege at all.\nUI:N - The attacker triggers the bug entirely through their own syscalls with no victim action required. An existing OrangeFS mount is a property of the deployment, not an action the attacker must induce a user to perform.\nS:U - The out-of-bounds read, hang, and oops all occur within the kernel of the same host, with no crossing into another security authority such as a hypervisor or IOMMU boundary.\nC:H - This is an unbounded out-of-bounds read that walks arbitrary kernel memory — live kernel stack contents, .rodata/.data, or the slab and direct map — far beyond a few bounded bytes. The resulting hash bucket (`sum % 16`) is observable to the attacker as a cache-hit/miss timing oracle over that adjacent kernel memory.\nI:H - The maintainer directly observed \"corrupted orangefs files\" when reproducing the bug, a confirmed loss of integrity of user data on a shared parallel filesystem. The broken xattr cache additionally governs POSIX ACL and `security.capability` retrieval, so mis-bucketed and stale entries can corrupt access-control and file-capability decisions.\nA:H - Confirmed kernel oops, hung user processes, and OOM from the associated unbounded kmalloc leak. The loop has no `cond_resched()` and runs with `xattr_sem` write-held in the set/remove paths, so it burns a CPU until it faults while blocking every other thread on that inode — soft lockups, RCU stalls, and hung tasks." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/orangefs/xattr.c" ], "versions": [ { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "c6564ff6b53c9a8dc786b6f1c51ae7688273f931", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "ef892d2bf4f3fa2c8de1677dd307e678bdd3d865", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "15afebb9597449c444801d1ff0b8d8b311f950ab", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "bc812574de633cf9a9ad6974490e45f6a4bb5126", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "e09a096104fc65859422817fb2211f35855983fe", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "9127d1e90c90e5960c8bc72a4ce2c209691a7021", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "c2ca015ac109fd743fdde27933d59dc5ad46658e", "status": "affected", "versionType": "git" }, { "version": "f7ab093f74bf638ed98fd1115f3efa17e308bb7f", "lessThan": "025e880759c279ec64d0f754fe65bf45961da864", "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/xattr.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.302", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "5.4.302" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.10.247" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.197" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.58" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c6564ff6b53c9a8dc786b6f1c51ae7688273f931" }, { "url": "https://git.kernel.org/stable/c/ef892d2bf4f3fa2c8de1677dd307e678bdd3d865" }, { "url": "https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab" }, { "url": "https://git.kernel.org/stable/c/bc812574de633cf9a9ad6974490e45f6a4bb5126" }, { "url": "https://git.kernel.org/stable/c/e09a096104fc65859422817fb2211f35855983fe" }, { "url": "https://git.kernel.org/stable/c/9127d1e90c90e5960c8bc72a4ce2c209691a7021" }, { "url": "https://git.kernel.org/stable/c/c2ca015ac109fd743fdde27933d59dc5ad46658e" }, { "url": "https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864" } ], "title": "orangefs: fix xattr related buffer overflow...", 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