Service interruption via concurrent receive-counter access
Published Apr 17, 2024 · Updated May 23, 2026
Race condition in the Linux kernel WireGuard receive path allows local users to interrupt service through concurrent counter access. The decrypt worker reads keypair->receiving_counter.counter while the receive poll path writes it without READ_ONCE() and WRITE_ONCE() annotations, so KCSAN reports a cross-CPU data race. Low-privileged local access and an active WireGuard receive path are required; published evidence limits the reported consequence to availability.
Summary
What happened
Race condition in the Linux kernel WireGuard receive path allows local users to interrupt service through concurrent counter access. The decrypt worker reads keypair->receiving_counter.counter while the receive poll path writes it without READ_ONCE() and WRITE_ONCE() annotations, so KCSAN reports a cross-CPU data race. Low-privileged local access and an active WireGuard receive path are required; published evidence limits the reported consequence to availability.
The record
- CVE
- CVE-2024-26861
- Published
- Apr 17, 2024
- Updated
- May 23, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-362, CWE-20, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 17, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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