Process hangs via lost robust futex wakeup
Published Aug 22, 2026 · Updated Aug 22, 2026
A race in robust futex handling in affected Linux kernel releases allows local users to leave waiting processes indefinitely asleep. Robust exit processing ignores a futex owned by another thread after unlock erased FUTEX_WAITERS, so a later owner releases it without waking remaining waiters. Triggering the hang requires a precise local race in which one woken waiter is killed while another thread acquires and releases the futex.
Summary
What happened
A race in robust futex handling in affected Linux kernel releases allows local users to leave waiting processes indefinitely asleep. Robust exit processing ignores a futex owned by another thread after unlock erased FUTEX_WAITERS, so a later owner releases it without waking remaining waiters. Triggering the hang requires a precise local race in which one woken waiter is killed while another thread acquires and releases the futex.
The record
- CVE
- CVE-2026-74658
- Published
- Aug 22, 2026
- Updated
- Aug 22, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-367
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2819f4030f43057238992a4adcd950d7c95aff65
- Affected versionversion=2c60b44d8ba9d62c2693d2692f118177f212b1a8
- Affected versionversion=3.16.82 <3.17
- Affected versionversion=3e24098da750991f75819069c79e090dfd029219
- Affected versionversion=4.14.158 <4.15
- Affected versionversion=4.19.87 <4.20
- Affected versionversion=4.9.264 <4.10
- Affected versionversion=5.3.14 <5.4
- Affected versionversion=5.4.1 <5.5
- Affected versionversion=5.5
- Affected versionversion=82ca3ab31b9cf23b86436a85381e4c5757bc6b80
- Affected versionversion=8dd558881e0f4d6942c19bd8f7b1a7c19becb59e
- Affected versionversion=b90aa237f469c3575190a5e6a855b76ad1d2ce94
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <33bfa85458105d6169ebdb697f692b8bb8025bae
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <6d4514ca9cdf61fec4ec634cf50386f6f7e69748
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <7b8c53263f8878bdd12c87e147ac6feca5c05211
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <7cf710e70f9bb8ea75f759ebed09871801315992
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <83b0f71d5a313a765754acab51d2ecc5de76e0b9
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <925628656b73b70930972ccde421de4f758d8650
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <a1c2b7b86a946b6b172bce44d74553da2323a36c
- Affected versionversion=ca16d5bee59807bf04deaab0a8eccecd5061528c <aa5c571901c6b22b58373693a4bf889ecab11ff5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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