CVE-2026-80778: Linux

Описание

Оригинално описание

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 ]

Засегнати продукти

• Linux Linux: 80367ad01d93ac781b0e1df246edaf006928002f преди 2b92e5562653b5293529f63b0300837d9dcedbd7; 80367ad01d93ac781b0e1df246edaf006928002f преди f7fb3e07752688842cbe0b85cf0d98c2fbf76b68; 80367ad01d93ac781b0e1df246edaf006928002f преди 43b148d796aa338858792d0167cebdc12b8cb4b9; 80367ad01d93ac781b0e1df246edaf006928002f преди 59b3732f95dda1fbd2234514d35f4fb6b5bb6d85
• Linux Linux: 6.16; преди 6.16; 6.18.47 до 6.18.*; 7.1.11 до 7.1.*; 7.2.1 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-80778
• https://nvd.nist.gov/vuln/detail/CVE-2026-80778
• https://git.kernel.org/stable/c/2b92e5562653b5293529f63b0300837d9dcedbd7
• https://git.kernel.org/stable/c/f7fb3e07752688842cbe0b85cf0d98c2fbf76b68
• https://git.kernel.org/stable/c/43b148d796aa338858792d0167cebdc12b8cb4b9
• https://git.kernel.org/stable/c/59b3732f95dda1fbd2234514d35f4fb6b5bb6d85