- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynamic ones) and when it hits zero, dynamic files get removed. Unfortunately, that removal can happen while another thread is in ffs_epfile_open(), but has not incremented the count yet. In that case open will succeed, leaving us with UAF on any subsequent read() or write(). The root cause is that ffs->opened is misused; atomic_dec_and_test() vs. atomic_add_return() is not a good idea, when object remains visible all along. To untangle that * serialize openers on ffs->mutex (both for ep0 and for dynamic files) * have dynamic ones use atomic_inc_not_zero() and fail if we had zero ->opened; in that case the file we are opening is doomed. * have the inodes of dynamic files marked on removal (from the callback of simple_recursive_removal()) - clear ->i_private there. * have open of dynamic ones verify they hadn't been already removed, along with checking that state is FFS_ACTIVE.
Timeline
ID reserved
By Linux
Published
- 10 months later
· 10 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 · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (9 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 ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < e002b3c1e6a0faa53329ef0d21e6351bcece6edb
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < 585a656283c954337036422afcd9cb70dd4135e7
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < 75240e5e51c6e6d67a3039384125fa54259a3926
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < e5bf5ee266633cb18fff6f98f0b7d59a62819eee
- affected 2.6.35
- unaffected < 2.6.35
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 6.19 – ≤ *
References
4
- https://git.kernel.org/stable/c/e002b3c1e6a0faa53329ef0d21e6351bcece6edb (opens in a new tab)
- https://git.kernel.org/stable/c/585a656283c954337036422afcd9cb70dd4135e7 (opens in a new tab)
- https://git.kernel.org/stable/c/75240e5e51c6e6d67a3039384125fa54259a3926 (opens in a new tab)
- https://git.kernel.org/stable/c/e5bf5ee266633cb18fff6f98f0b7d59a62819eee (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-2026-2275 (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-2025-71074)Record last updated .