CVE-2026-46234
In the Linux kernel, the following vulnerability has been resolved: vsock: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.
Affected versions
Linux kernel versions
5.5
and later are affected. Fixed in
5.10.258,
5.15.209,
6.1.175,
6.6.140,
6.12.90,
6.18.32,
7.0.9,
7.1-rc1
and their respective stable series.
References
The following references provide additional information about CVE-2026-46234 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188
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PatchKernel patch commithttps://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536
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PatchKernel patch commithttps://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160
Frequently asked questions
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What is CVE-2026-46234?
CVE-2026-46234 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.5 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-46234 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46234?
Yes — CVE-2026-46234 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46234 actively exploited?
No — CVE-2026-46234 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.