CVE-2026-31555

Katalog CVE

CVSS 5.5 · Medium EPSS 0,17%

Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 April 2026

Terakhir diubah

14 Juli 2026

Status NVD

Modified

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

EPSS (30 hari)

0,17% peluang dieksploitasi; lebih tinggi dari 5,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/210d36d892de5195e6766c45519dfb1e65f3eb83 patch
• https://git.kernel.org/stable/c/33095ae3bdde5e5c264d7e88a2f3e7703a26c7aa patch
• https://git.kernel.org/stable/c/5e8e06bf8909e79b4acd950cf578cfc2f10bbefa patch
• https://git.kernel.org/stable/c/71112e62807d1925dc3ae6188b11f8cfc85aec23 patch
• https://git.kernel.org/stable/c/7475dfad10a05a5bfadebf5f2499bd61b19ed293 patch
• https://git.kernel.org/stable/c/92e47ad03e03dbb5515bdf06444bf6b1e147310d patch
• https://git.kernel.org/stable/c/de7c0c04ad868f2cee6671b11c0a6d20421af1da patch
• https://git.kernel.org/stable/c/e7824ec168d2ac883a213cd1f4d6cc0816002a85 patch
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html