CVE-2026-43499: stato di sfruttamento e disponibilità della patch
CVE-2026-43499 · CVSS 7.8 HIGH · EPSS 1%
In the Linux kernel, the following vulnerability has been resolved:
rtmutex: Use waiter::task instead of current in remove_waiter()
remove_waiter() is used by the slowlock paths, but it is also used for
proxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from
futex_requeue().
In the latter case waiter::task is not current, but remove_waiter()
operates on current for the dequeue operation. That results in several
problems:
1) the rbtree dequeue happens without waiter::task::pi_lock being held
2) the waiter task's pi_blocked_on state is not cleared, which leaves a
dangling pointer primed for UAF around.
3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter
task
Use waiter::task instead of current in all related operations in
remove_waiter() to cure those problems.
[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the
changelog ]
CVE-2026-43499 viene sfruttato?
Non è nel catalogo CISA KEV.
EPSS stima la probabilità di sfruttamento nei prossimi 30 giorni al 1%.
Codice di exploit pubblico: nessuno trovato nelle fonti monitorate.
Quali prodotti e versioni sono interessati?
Nessun elenco di pacchetti interessati registrato qui.