CVE-2026-43366io_uring/kbuf: check if target buffer list is still legacy on recycle
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% 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: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 5 months later
· 5 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 | 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)
- 0.13% · top 98% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < a7b33671e418fca507feebd1d56e7f4952a4b25c
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < 439a6728ec4641ffad1ca796622c19bc525e570f
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < 50ad880db3013c6fee0ef13781762a39e2e7ef83
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < 97b57f69fee1b61b41acbf37e7720cac9d389fa4
- affected c7fb19428d67dd0a2a78a4f237af01d39c78dc5a – < c2c185be5c85d37215397c8e8781abf0a69bec1f
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c (opens in a new tab)
- https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f (opens in a new tab)
- https://git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa (opens in a new tab)
- https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83 (opens in a new tab)
- https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4 (opens in a new tab)
- https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f (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-2026-28672 (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-2026-43366)Record last updated .