CVE-2026-46234

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < f6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccaaffected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < caf11dfea5233a69298a1c448bbf8d1639c80536affected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < 01ef69785dc3162f588a361ab770b1e312800188affected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < a998a7e250bf976539e05a00ec64a81292afecaaaffected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < 310da27932dd0afe7ce7456dfe1f0814c3301f41affected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160affected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < 0b68881501460c3761f196469e1e503218c5e536affected
LinuxLinuxb9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 < d114bfdc9b76bf93b881e195b7ec957c14227babaffected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.90 <= 6.12.*unaffected
LinuxLinux6.18.32 <= 6.18.*unaffected
LinuxLinux7.0.9 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References