Local service hang via perf ring-buffer race
Published Feb 26, 2025 · Updated May 23, 2026
Race condition in Linux kernel perf in affected versions allows local users to hang perf_mmap through concurrent output reassignment and mapping closure. perf_event_set_output() and perf_mmap_close() lock different event mmap mutexes, letting a new event attach after teardown begins and remain bound to an unmapped ring buffer. The caller needs local low-privileged access and must win a timing race; the affected perf_mmap call then retries indefinitely without reported data access or modification.
Summary
What happened
Race condition in Linux kernel perf in affected versions allows local users to hang perf_mmap through concurrent output reassignment and mapping closure. perf_event_set_output() and perf_mmap_close() lock different event mmap mutexes, letting a new event attach after teardown begins and remain bound to an unmapped ring buffer. The caller needs local low-privileged access and must win a timing race; the affected perf_mmap call then retries indefinitely without reported data access or modification.
The record
- CVE
- CVE-2022-49607
- Published
- Feb 26, 2025
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-362, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 2025CVE publishedPublication date reported by the CVE source.
- May 23, 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=2487f0db30527032c4d56fc2d0b1a240fe89fef8
- Affected versionversion=3.10
- Affected versionversion=3.2.49 <3.3
- Affected versionversion=3.4.52 <3.5
- Affected versionversion=3.9.8 <3.10
- Affected versionversion=703197b61d05f5edae54bad3256901c5a5c8794c
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <17f5417194136517ee9bbd6511249e5310e5617c
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <3bbd868099287ff9027db59029b502fcfa2202a0
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <43128b3eee337824158f34da6648163d2f2fb937
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <68e3c69803dada336893640110cb87221bb01dcf
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <a9391ff7a7c5f113d6f2bf6621d49110950de49c
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <da3c256e2d0ebc87c7db0c605c9692b6f1722074
- Affected versionversion=9bb5d40cd93c9dd4be74834b1dcb1ba03629716b <f836f9ac95df15f1e0af4beb0ec20021e8c91998
- Affected versionversion=c52217e88ae0f3a4ae00562d86e338f8f85969b4
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
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Technologies
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