CVE-2026-46234

vsock: fix buffer size clamping order

State: Published
Severity: Not scored
Published: May 28, 2026
Updated: Oct 15, 2026
Reserved: May 13, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before f6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccaAffected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before caf11dfea5233a69298a1c448bbf8d1639c80536Affected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 01ef69785dc3162f588a361ab770b1e312800188Affected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before a998a7e250bf976539e05a00ec64a81292afecaaAffected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 310da27932dd0afe7ce7456dfe1f0814c3301f41Affected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160Affected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 0b68881501460c3761f196469e1e503218c5e536Affected b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before d114bfdc9b76bf93b881e195b7ec957c14227babAffected
LinuxLinux	5.5Affected before 5.5Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.90 through 6.12.Not affected 6.18.32 through 6.18.Not affected 7.0.9 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before f6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccaAffected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before caf11dfea5233a69298a1c448bbf8d1639c80536Affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 01ef69785dc3162f588a361ab770b1e312800188Affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before a998a7e250bf976539e05a00ec64a81292afecaaAffected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 310da27932dd0afe7ce7456dfe1f0814c3301f41Affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160Affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before 0b68881501460c3761f196469e1e503218c5e536Affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 to before d114bfdc9b76bf93b881e195b7ec957c14227babAffected

LinuxLinux

5.5Affected
before 5.5Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.90 through 6.12.*Not affected
6.18.32 through 6.18.*Not affected
7.0.9 through 7.0.*Not affected
7.1 and laterNot affected

References

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