CVE-2026-43499

Advisory lineage Upstream: 0 Downstream: 11
Awaiting Analysis
Published: 21 May 2026, 12:17
Last modified:14 Jun 2026, 17:45

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.13% LOW
0% probability +0.11%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 May 2026, 12:17
Published
Vulnerability first disclosed
14 Jun 2026, 17:45
Last Modified
Vulnerability information updated

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 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 ]

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.13%• Percentile: 3%

Affected Systems

  • linux•linux

    ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < d8cce4773c2b23d819baf5abedc62f7b430e8745 | ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < 8a1fc8d698ac5e5916e3082a0f74450d71f9611f | ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 | ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < 3fb7394a837740770f0d6b4b30567e60786a63f2 | ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < 88614876370aac8ad1050ad785a4c095ba17ac11 | ≥ 8161239a8bcce9ad6b537c04a1fa3b5c68bae693, < 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 | 2.6.39

References (6)