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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-43499

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

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Status
Published
Published
Updated
Assigning organization
Linux

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 ]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < f3fa3424bceb128d2be4b3745506b22844b87db7affected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 838ce5cb5d93c3ab8b27e75bc6ad905a94b752fdaffected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < d8cce4773c2b23d819baf5abedc62f7b430e8745affected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 8a1fc8d698ac5e5916e3082a0f74450d71f9611faffected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 6d52dfcb2a5db86e346cf51f8fcf2071b8085166affected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 3fb7394a837740770f0d6b4b30567e60786a63f2affected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 88614876370aac8ad1050ad785a4c095ba17ac11affected
  • 8161239a8bcce9ad6b537c04a1fa3b5c68bae693 to < 3bfdc63936dd4773109b7b8c280c0f3b5ae7d349affected

Linux Linux

Default version status: affected

  • 2.6.39affected
  • 0 to < 2.6.39unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.140 to ≤ 6.6.*unaffected
  • 6.12.86 to ≤ 6.12.*unaffected
  • 6.18.27 to ≤ 6.18.*unaffected
  • 7.0.4 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References