Local kernel panic via TIPC length truncation
Published Aug 10, 2026 · Updated Aug 10, 2026
Integer overflow in the Linux TIPC receive path allows local users to crash affected kernels through oversized io_uring-provided buffers. In tipc_recvmsg() and tipc_recvstream(), min_t(int, ...) truncates a size_t length above INT_MAX to a negative int that is later promoted to SIZE_MAX. A local low-privileged user must reach the TIPC receive path; the resulting WARN_ON causes a system-wide panic when panic_on_warn is enabled.
Summary
What happened
Integer overflow in the Linux TIPC receive path allows local users to crash affected kernels through oversized io_uring-provided buffers. In tipc_recvmsg() and tipc_recvstream(), min_t(int, ...) truncates a size_t length above INT_MAX to a negative int that is later promoted to SIZE_MAX. A local low-privileged user must reach the TIPC receive path; the resulting WARN_ON causes a system-wide panic when panic_on_warn is enabled.
The record
- CVE
- CVE-2026-68289
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-131, T1529
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=4.12
- Affected versionversion=e9f8b10101c6da3ab000a2fb17162374c9bd2c69 <47f42ff521b4eeb46e82f9a46a4783a99f7570d7
- Affected versionversion=e9f8b10101c6da3ab000a2fb17162374c9bd2c69 <fe9bf32bb18f2d35789d4960fb007d1059bbaa38
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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