CVE-2026-80758futex: Avoid private hash use-after-free on final put
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% 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: futex: Avoid private hash use-after-free on final put futex_private_hash_put() drops the reference to fph before evaluating fph->mm for wake_up_var(). futex_ref_put() enables preemption again before returning. If that put drops the final reference and the task is preempted, another task can pivot to the replacement hash and free the old hash after an RCU grace period. The first task then reads fph->mm from the freed allocation when it resumes. KASAN reports a slab-use-after-free in futex_private_hash_put(), with the read at offset 24 in a freed kmalloc-512 allocation. The allocation and free stacks point to futex_hash_allocate() and the RCU free path, respectively. Load the mm pointer while the fph reference is still held and pass the saved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue key and does not dereference the mm through it.
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 45 days later
· 45 days 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected bd54df5ea7cadac520e346d5f0fe5d58e635b6ba – < dba60d26e9dda3e157ad6b0934d4232f6c6904ee
- affected bd54df5ea7cadac520e346d5f0fe5d58e635b6ba – < 12cd315a7b6a7d7db3f69d98bfe3909275e9451d
- affected bd54df5ea7cadac520e346d5f0fe5d58e635b6ba – < 25408c62ed4ebcd491d0e9e4b4a5b512547512e4
- affected bd54df5ea7cadac520e346d5f0fe5d58e635b6ba – < 1c7efabfbaf796f11000a46094a69955a01ec6cc
- affected 6.16
- unaffected < 6.16
- unaffected 6.18.47 – ≤ 6.18.*
- unaffected 7.1.11 – ≤ 7.1.*
- unaffected 7.2.1 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/dba60d26e9dda3e157ad6b0934d4232f6c6904ee (opens in a new tab)
- https://git.kernel.org/stable/c/12cd315a7b6a7d7db3f69d98bfe3909275e9451d (opens in a new tab)
- https://git.kernel.org/stable/c/25408c62ed4ebcd491d0e9e4b4a5b512547512e4 (opens in a new tab)
- https://git.kernel.org/stable/c/1c7efabfbaf796f11000a46094a69955a01ec6cc (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-2026-71401 (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-2026-80758)Record last updated .