264 lines
15 KiB
JSON
264 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40306",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.185Z",
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"datePublished": "2025-12-08T00:46:31.514Z",
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"dateUpdated": "2026-08-05T12:09:24.767Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:09:24.767Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: fix xattr related buffer overflow...\n\nWilly Tarreau <w@1wt.eu> forwarded me a message from\nDisclosure <disclosure@aisle.com> 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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/orangefs/xattr.c"
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],
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"lessThan": "c2ca015ac109fd743fdde27933d59dc5ad46658e",
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"status": "affected",
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"status": "affected",
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/orangefs/xattr.c"
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],
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{
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"version": "4.6",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.6",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.302",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.247",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.197",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.1.159",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.117",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.58",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.8",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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}
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"cpeApplicability": [
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"url": "https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab"
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864"
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}
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],
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"title": "orangefs: fix xattr related buffer overflow...",
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