Kernel warning via SQPOLL task-state mismatch
Published Oct 29, 2024 · Updated May 11, 2026
Improper task-state handling in Linux allows local users to trigger a kernel scheduler warning through io_uring SQPOLL teardown. io_uring_cancel_generic() runs pending task work while the SQPOLL thread is waiting in TASK_INTERRUPTIBLE, so task work takes the ring mutex before the state is reset to TASK_RUNNING. Triggering requires a local SQPOLL thread to exit with pending task work; published evidence demonstrates a scheduler warning rather than a kernel crash.
Summary
What happened
Improper task-state handling in Linux allows local users to trigger a kernel scheduler warning through io_uring SQPOLL teardown. io_uring_cancel_generic() runs pending task work while the SQPOLL thread is waiting in TASK_INTERRUPTIBLE, so task work takes the ring mutex before the state is reset to TASK_RUNNING. Triggering requires a local SQPOLL thread to exit with pending task work; published evidence demonstrates a scheduler warning rather than a kernel crash.
The record
- CVE
- CVE-2024-50079
- Published
- Oct 29, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 29, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=6.9
- Affected versionversion=af5d68f8892f8ee8f137648b79ceb2abc153a19b <887ba598d9cfb537bdb3dfd95f087ff8a08cb74d
- Affected versionversion=af5d68f8892f8ee8f137648b79ceb2abc153a19b <8f7033aa4089fbaf7a33995f0f2ee6c9d7b9ca1b
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Attacks
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