Local privilege escalation via interruptible RNG wait
Published Jul 25, 2026 · Updated Jul 25, 2026
Use-after-free in the Linux kernel loongson-rng driver allows local users to gain kernel privileges through AF_ALG RNG requests. The command path returns when wait_for_completion_interruptible() is interrupted by a signal, while the asynchronous engine operation retains released request state. An unprivileged account, a Loongson security engine with loongson-rng enabled, and access to AF_ALG sockets are required; exploitation permits kernel-memory disclosure or corruption and can crash the host.
Summary
What happened
Use-after-free in the Linux kernel loongson-rng driver allows local users to gain kernel privileges through AF_ALG RNG requests. The command path returns when wait_for_completion_interruptible() is interrupted by a signal, while the asynchronous engine operation retains released request state. An unprivileged account, a Loongson security engine with loongson-rng enabled, and access to AF_ALG sockets are required; exploitation permits kernel-memory disclosure or corruption and can crash the host.
The record
- CVE
- CVE-2026-64311
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 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=6.18
- Affected versionversion=766b2d724c8df071031412eea902b566a0049c31 <037ec8353711c79353b12d5634e0c9ff363a9efa
- Affected versionversion=766b2d724c8df071031412eea902b566a0049c31 <43de8b9f01b7dd2f6ca5360c6bf2f203c02288dc
- Affected versionversion=766b2d724c8df071031412eea902b566a0049c31 <af3d1bb9a09daf928fc3f173689fb7904d6a6d4f
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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