rtmutex: Use waiter::task instead of current in remove_waiter()

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Summary

CVECVE-2026-43499
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-21 13:16:19 UTC
Updated2026-06-26 17:28:54 UTC
DescriptionIn 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 ]

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000130000 probability, percentile 0.024910000 (date 2026-06-04)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 d8cce4773c2b23d819baf5abedc62f7b430e8745 git Not specified
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 8a1fc8d698ac5e5916e3082a0f74450d71f9611f git Not specified
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 6d52dfcb2a5db86e346cf51f8fcf2071b8085166 git Not specified
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 3fb7394a837740770f0d6b4b30567e60786a63f2 git Not specified
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 88614876370aac8ad1050ad785a4c095ba17ac11 git Not specified
CNA Linux Linux affected 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 git Not specified
CNA Linux Linux affected 2.6.39 Not specified
CNA Linux Linux unaffected 2.6.39 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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