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CVE-2026-31555: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: futex: Clear stale exiting pointer in futex_lock_pi() retry path Fuzzying/stressing futexes triggered: WARNING: kernel/futex/core.c:825 at wait_for_owner_exiting+0x7a/0x80, CPU#11: futex_lock_pi_s/524 When futex_lock_pi_atomic() sees the owner is exiting, it returns -EBUSY and stores a refcounted task pointer in 'exiting'. After wait_for_owner_exiting() consumes that reference, the local pointer is never reset to nil. Upon a retry, if futex_lock_pi_atomic() returns a different error, the bogus pointer is passed to wait_for_owner_exiting(). CPU0 CPU1 CPU2 futex_lock_pi(uaddr) // acquires the PI futex exit() futex_cleanup_begin() futex_state = EXITING; futex_lock_pi(uaddr) futex_lock_pi_atomic() attach_to_pi_owner() // observes EXITING *exiting = owner; // takes ref return -EBUSY wait_for_owner_exiting(-EBUSY, owner) put_task_struct(); // drops ref // exiting still points to owner goto retry; futex_lock_pi_atomic() lock_pi_update_atomic() cmpxchg(uaddr) *uaddr ^= WAITERS // whatever // value changed return -EAGAIN; wait_for_owner_exiting(-EAGAIN, exiting) // stale WARN_ON_ONCE(exiting) Fix this by resetting upon retry, essentially aligning it with requeue_pi.

    Засегнати продукти

    • Linux Linux: 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди e7824ec168d2ac883a213cd1f4d6cc0816002a85; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 5e8e06bf8909e79b4acd950cf578cfc2f10bbefa; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди de7c0c04ad868f2cee6671b11c0a6d20421af1da; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 7475dfad10a05a5bfadebf5f2499bd61b19ed293; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 92e47ad03e03dbb5515bdf06444bf6b1e147310d; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 71112e62807d1925dc3ae6188b11f8cfc85aec23; 3ef240eaff36b8119ac9e2ea17cbf41179c930ba преди 210d36d892de5195e6766c45519dfb1e65f3eb83; f2a9957e5c08b1b1caacd18a3dc4c0a1bdb7b463; cf16e42709aa86aa3e37f3acc3d13d5715d90096; 61fa9f167caaa73d0a7c88f498eceeb12c6fa3db; 7874eee0130adf9bee28e8720bb5dd051089def3; fc3b55ef2c840bb2746b2d8121a0788de84f7fac; 4.4.255 преди 4.5; 4.9.255 преди 4.10; 4.14.158 преди 4.15; 4.19.172 преди 4.20; 5.4.1 преди 5.5
    • Linux Linux: 5.5; преди 5.5; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.131 до 6.6.*; 6.12.80 до 6.12.*; 6.18.21 до 6.18.*; 6.19.11 до 6.19.*; 7.0 до *
    • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP: V3.1.6 преди *
    • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP: V3.1.6 преди *

    История

    • 24 април 2026 Публикувано

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    Първоизточници

    CVE-2026-31555: Linux | freedomonline.bg