CVE-2025-40306orangefs: fix xattr related buffer overflow...
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: orangefs: fix xattr related buffer overflow... Willy Tarreau <[email protected]> forwarded me a message from Disclosure <[email protected]> with the following warning: > The helper `xattr_key()` uses the pointer variable in the loop condition > rather than dereferencing it. As `key` is incremented, it remains non-NULL > (until it runs into unmapped memory), so the loop does not terminate on > valid C strings and will walk memory indefinitely, consuming CPU or hanging > the thread. I easily reproduced this with setfattr and getfattr, causing a kernel oops, hung user processes and corrupted orangefs files. Disclosure sent along a diff (not a patch) with a suggested fix, which I based this patch on. After xattr_key started working right, xfstest generic/069 exposed an xattr related memory leak that lead to OOM. xattr_key returns a hashed key. When adding xattrs to the orangefs xattr cache, orangefs used hash_add, a kernel hashing macro. hash_add also hashes the key using hash_log which resulted in additions to the xattr cache going to the wrong hash bucket. generic/069 tortures a single file and orangefs does a getattr for the xattr "security.capability" every time. Orangefs negative caches on xattrs which includes a kmalloc. Since adds to the xattr cache were going to the wrong bucket, every getattr for "security.capability" resulted in another kmalloc, none of which were ever freed. I changed the two uses of hash_add to hlist_add_head instead and the memory leak ceased and generic/069 quit throwing furniture.
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < c6564ff6b53c9a8dc786b6f1c51ae7688273f931
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < ef892d2bf4f3fa2c8de1677dd307e678bdd3d865
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < 15afebb9597449c444801d1ff0b8d8b311f950ab
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < bc812574de633cf9a9ad6974490e45f6a4bb5126
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < e09a096104fc65859422817fb2211f35855983fe
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < 9127d1e90c90e5960c8bc72a4ce2c209691a7021
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < c2ca015ac109fd743fdde27933d59dc5ad46658e
- affected f7ab093f74bf638ed98fd1115f3efa17e308bb7f – < 025e880759c279ec64d0f754fe65bf45961da864
- affected 4.6
- unaffected < 4.6
- unaffected 5.4.302 – ≤ 5.4.*
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.117 – ≤ 6.6.*
- unaffected 6.12.58 – ≤ 6.12.*
- unaffected 6.17.8 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References8
- https://git.kernel.org/stable/c/c6564ff6b53c9a8dc786b6f1c51ae7688273f931 (opens in a new tab)
- https://git.kernel.org/stable/c/ef892d2bf4f3fa2c8de1677dd307e678bdd3d865 (opens in a new tab)
- https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab (opens in a new tab)
- https://git.kernel.org/stable/c/bc812574de633cf9a9ad6974490e45f6a4bb5126 (opens in a new tab)
- https://git.kernel.org/stable/c/e09a096104fc65859422817fb2211f35855983fe (opens in a new tab)
- https://git.kernel.org/stable/c/9127d1e90c90e5960c8bc72a4ce2c209691a7021 (opens in a new tab)
- https://git.kernel.org/stable/c/c2ca015ac109fd743fdde27933d59dc5ad46658e (opens in a new tab)
- https://git.kernel.org/stable/c/025e880759c279ec64d0f754fe65bf45961da864 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201639 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40306)Record last updated .