Kernel code execution via duplicate recvmsg requeue
Published Feb 4, 2026 · Updated Feb 4, 2026
Use-after-free in Linux Kernel allows local users to execute code in kernel context through recvmsg() on a local AF_RXRPC socket. When MSG_DONTWAIT finds the front call's mutex locked, rxrpc_recvmsg() requeues a call already linked by MSG_PEEK or the I/O thread, corrupting the receive queue. An unprivileged user can create the socket and control the two-thread race; the resulting corruption can expose or overwrite kernel memory or panic the system.
Summary
What happened
Use-after-free in Linux Kernel allows local users to execute code in kernel context through recvmsg() on a local AF_RXRPC socket. When MSG_DONTWAIT finds the front call's mutex locked, rxrpc_recvmsg() requeues a call already linked by MSG_PEEK or the I/O thread, corrupting the receive queue. An unprivileged user can create the socket and control the two-thread race; the resulting corruption can expose or overwrite kernel memory or panic the system.
The record
- CVE
- CVE-2026-23066
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-674, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 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?
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- Affected versionversion=4.11
- Affected versionversion=540b1c48c37ac0ad66212004db21e1ff7e2d78be <2c28769a51deb6022d7fbd499987e237a01dd63a
- Affected versionversion=540b1c48c37ac0ad66212004db21e1ff7e2d78be <930114425065f7ace6e0c0630fab4af75e059ea8
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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