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.

Score

CVSS 3.1 7.8 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-05-28

Last modified

2026-10-15

Weaknesses

CWE-787

Affected products

• Linux Kernel (Linux)
• Simatic S7-1500 Tm Mfp - Gnulinux Subsystem (Siemens)

References

• https://git.kernel.org/stable/c/f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca
• https://git.kernel.org/stable/c/caf11dfea5233a69298a1c448bbf8d1639c80536
• https://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188
• https://git.kernel.org/stable/c/a998a7e250bf976539e05a00ec64a81292afecaa
• https://git.kernel.org/stable/c/310da27932dd0afe7ce7456dfe1f0814c3301f41
• https://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160
• https://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536
• https://git.kernel.org/stable/c/d114bfdc9b76bf93b881e195b7ec957c14227bab
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html