Out-of-bounds Write Affecting kernel-obs-build package, versions <6.4.0-150600.23.135.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.17% (7th percentile)

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  • Snyk IDSNYK-SLES156-KERNELOBSBUILD-20253391
  • published29 Sept 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

NewCVE-2026-64304  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 kernel-obs-build to version 6.4.0-150600.23.135.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-obs-build package and not the kernel-obs-build package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

crypto: qat - validate RSA CRT component lengths

The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with:

memcpy(dst + half_key_sz - len, src, len)

When a CRT component is larger than half_key_sz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption.

Add a len > half_key_sz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.

CVSS Base Scores

version 3.1