Kernel memory corruption via MPTCP socket race
Published Feb 26, 2025 · Updated Aug 5, 2026
Use-after-free in Linux kernel MPTCP 5.17 through 5.18.9 allows local users to corrupt memory by closing a prepared listener. Closing an MPTCP listener frees unaccepted subflows while its worker can still dereference the uncleared msk->first pointer between paired-socket deletions. Low-privileged local access is required to create the listener and drive the race; the published record establishes invalid kernel memory access but no specific crash or code-execution result.
Summary
What happened
Use-after-free in Linux kernel MPTCP 5.17 through 5.18.9 allows local users to corrupt memory by closing a prepared listener. Closing an MPTCP listener frees unaccepted subflows while its worker can still dereference the uncleared msk->first pointer between paired-socket deletions. Low-privileged local access is required to create the listener and drive the race; the published record establishes invalid kernel memory access but no specific crash or code-execution result.
The record
- CVE
- CVE-2022-49669
- Published
- Feb 26, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 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=5.17
- Affected versionversion=86e39e04482b0aadf3ee3ed5fcf2d63816559d36 <6aeed9045071f2252ff4e98fc13d1e304f33e5b0
- Affected versionversion=86e39e04482b0aadf3ee3ed5fcf2d63816559d36 <a8a3e95c74e48c2c9b07b81fafda9122993f2e12
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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Public exploit references
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Technologies
Your stack
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Your stack
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