PT-2026-52259 · Linux · Linux
Publicado
2026-06-25
·
Atualizado
2026-06-25
·
CVE-2026-53163
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In the Linux kernel, the following vulnerability has been resolved:
locking/rtmutex: Skip remove waiter() when waiter is not enqueued
syzbot triggered the following splat in remove waiter() via
FUTEX CMP REQUEUE PI:
KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f]
class raw spinlock constructor
remove waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561
rt mutex start proxy lock+0x103/0x120
futex requeue+0x10e4/0x20d0
x64 sys futex+0x34f/0x4d0
task blocks on rt mutex() does not arm the waiter upon deadlock detection,
leaving waiter->task nil, where 3bfdc63936dd ("rtmutex: Use waiter::task instead
of current in remove waiter()") made this fatal.
Furthermore, rt mutex start proxy lock() should not be calling into remove waiter()
upon a successfully grabbing the rtmutex. 1a1fb985f2e2 ("futex: Handle early deadlock
return correctly"), moved the remove waiter() out of rt mutex start proxy lock()
(where 'ret' was only ever 0 or < 0) into the wrapper. Tighten this check to
account for try to take rt mutex().
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