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cve recordhigh

CVE-2026-43499

linux · linux kernel

Published
CVSS7.8
Severityhigh
WeaknessCWE-416
ExploitedNot in CISA KEV

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

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 prio

References

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Our coverage of CVE-2026-43499

CVE-2026-43499critical

15-Year-Old GhostLock Flaw Enables Root and Container Escape on Most Linux Distros

Nebula Security has revealed GhostLock (CVE-2026-43499), a Linux kernel vulnerability present for 15 years. This flaw allows any logged-in user to achieve root privileges and container escape on unpatched systems, as it is included by default in most Linux distributions.