Linux Kernel vsock Buffer Size Clamping Order Flaw
CVE-2026-46234 Published on May 28, 2026
vsock: fix buffer size clamping order
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.
Products Associated with CVE-2026-46234
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Affected Versions
Linux:- Version b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and below a998a7e250bf976539e05a00ec64a81292afecaa is affected.
- Version b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and below 310da27932dd0afe7ce7456dfe1f0814c3301f41 is affected.
- Version b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and below 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160 is affected.
- Version b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and below 0b68881501460c3761f196469e1e503218c5e536 is affected.
- Version b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and below d114bfdc9b76bf93b881e195b7ec957c14227bab is affected.
- Version 5.5 is affected.
- Before 5.5 is unaffected.
- Version 6.6.140, <= 6.6.* is unaffected.
- Version 6.12.90, <= 6.12.* is unaffected.
- Version 6.18.32, <= 6.18.* is unaffected.
- Version 7.0.9, <= 7.0.* is unaffected.
- Version 7.1-rc1, <= * is unaffected.