{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74658",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-74658"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "futex: Prevent robust futex exit race some more",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Prevent robust futex exit race some more\n\nA robust futex unlock stores 0 over the whole futex value - wiping\nFUTEX_WAITERS - and wakes a single waiter. That wakeup is a one-shot\nnotification: the protocol relies on its recipient to either acquire the\nfutex (and eventually unlock while aware of the remaining contention) or\nre-arm FUTEX_WAITERS before sleeping again.  If the woken waiter is killed\nbefore it can do either, the kernel must jump in and wake the next task\ndown the line.\n\nThis is a known complication of the futex protocol with a previous\npartial fix in commit ca16d5bee598 (\"futex: Prevent robust futex exit\nrace\"). Unfortunately, that fix is insufficient.\n\nIf a third task re-acquired the futex through the uncontended fast\npath in the meantime, the notification is lost: robust exit processing\nsees that it is owned by another task and does nothing, while the new\nowner sees no FUTEX_WAITERS when it unlocks and wakes nobody.\nThe remaining waiters sleep forever behind a free futex:\n\n  A owns the futex, B and C sleep in FUTEX_WAIT\n                                        uval == A | FUTEX_WAITERS\n  A robust unlock: store 0, FUTEX_WAKE(1) wakes B\n                                        uval == 0\n  D fast path acquire: cmpxchg(0 -> D)\n                                        uval == D, no FUTEX_WAITERS\n  B killed before acting on the wakeup\n  B exit walk, pending op: owner D != B -> no action\n  D unlock: no FUTEX_WAITERS -> no wake\n                                        C sleeps forever\n\nThis is clearly a shortcoming in the implementation, which fails to keep\nthe FUTEX_WAITERS bit consistent.\n\nWork around this by augmenting the robust list exit processing to also\nperform the extra wakeup if the futex word is owned by another thread but\nFUTEX_WAITERS is not set.\n\nThis does not fix the problem of a non-contended take over/release and free\nsequence, which has been discussed for years and has been addressed by\ncommit 3ca9595d9fb6 (\"futex: Add support for unlocking robust futexes\") and\nsubsequent changes, but failed to take the problem described above into\naccount.\n\nA more complete solution which is based on the in kernel unlock of\ncontended robust futexes has been discussed in the context of this change\nand should show up in mainline sooner than later.\n\n[ tglx: Amend change log slightly and fixup coding style ]",
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}