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Vulnerability record · CVE-2026-46234 · published 28 May 2026

CVE-2026-46234: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188 Patch
https://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536 Patch
https://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160 Patch
https://git.kernel.org/stable/c/310da27932dd0afe7ce7456dfe1f0814c3301f41 Patch
https://git.kernel.org/stable/c/a998a7e250bf976539e05a00ec64a81292afecaa Patch
https://git.kernel.org/stable/c/caf11dfea5233a69298a1c448bbf8d1639c80536 Patch
https://git.kernel.org/stable/c/d114bfdc9b76bf93b881e195b7ec957c14227bab Patch
https://git.kernel.org/stable/c/f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46234), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.