CVE-2026-80778futex/pi: Reject cross-mm private futex owners
- —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/pi: Reject cross-mm private futex owners A private futex key borrows the waiter's mm without taking an mm_users reference. Nevertheless, attach_to_pi_owner() currently accepts an owner from a different address space and copies the private key into the owner's PI state. When that owner exits, exit_pi_state_list() uses the saved key to find the hash bucket and acquires a reference to the waiter's private hash. If the last user of the waiter's mm exits concurrently, futex_hash_free() frees the hash while the owner still uses its bucket and reference. Prevent this by validating in attach_to_pi_owner() that, for private futexes, the owner mm and waiter mm are the same. Perform the check with the owner's pi_lock held and after validating owner::futex::state to serialize against a concurrent PI-state exit cleanup. [ tglx: Amended comment ]
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 (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 80367ad01d93ac781b0e1df246edaf006928002f – < 2b92e5562653b5293529f63b0300837d9dcedbd7
- affected 80367ad01d93ac781b0e1df246edaf006928002f – < f7fb3e07752688842cbe0b85cf0d98c2fbf76b68
- affected 80367ad01d93ac781b0e1df246edaf006928002f – < 43b148d796aa338858792d0167cebdc12b8cb4b9
- affected 80367ad01d93ac781b0e1df246edaf006928002f – < 59b3732f95dda1fbd2234514d35f4fb6b5bb6d85
- 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/2b92e5562653b5293529f63b0300837d9dcedbd7 (opens in a new tab)
- https://git.kernel.org/stable/c/f7fb3e07752688842cbe0b85cf0d98c2fbf76b68 (opens in a new tab)
- https://git.kernel.org/stable/c/43b148d796aa338858792d0167cebdc12b8cb4b9 (opens in a new tab)
- https://git.kernel.org/stable/c/59b3732f95dda1fbd2234514d35f4fb6b5bb6d85 (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-2026-71421 (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-2026-80778)Record last updated .