CVE-2026-80778
CVE CVE-2026-80778EUVD EUVD-2026-71421Published 2026-09-04T15:12:50.000Z
What the advisory describes
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 ]
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux 80367ad01d93ac781b0e1df246edaf006928002f <43b148d796aa338858792d0167cebdc12b8cb4b9; 80367ad01d93ac781b0e1df246edaf006928002f <f7fb3e07752688842cbe0b85cf0d98c2fbf76b68; patch: 7.1.11; 6.16; 80367ad01d93ac781b0e1df246edaf006928002f <2b92e5562653b5293529f63b0300837d9dcedbd7; patch: 7.3-rc1; patch: 0; 80367ad01d93ac781b0e1df246edaf006928002f <59b3732f95dda1fbd2234514d35f4fb6b5bb6d85; patch: 7.2.1; patch: 6.18.47
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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