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Vulnerability record · CVE-2026-43330 · published 8 May 2026

CVE-2026-43330: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: crypto: caam - fix overflow on long hmac keys When a key longer than block size is supplied, it is copied and then hashed into the real key. The memory allocated for the copy needs to be rounded to DMA cache alignment, as otherwise the hashed key may corrupt neighbouring memory. The copying is performed using kmemdup, however this leads to an overflow: reading more bytes (aligned_len - keylen) from the keylen source buffer. Fix this by replacing kmemdup with kmalloc, followed by memcpy.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.7% 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
5References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: caam - fix overflow on long hmac keys When a key longer than block size is supplied, it is copied and then hashed into the real key. The memory allocated for the copy needs to be rounded to DMA cache alignment, as otherwise the hashed key may corrupt neighbouring memory. The copying is performed using kmemdup, however this leads to an overflow: reading more bytes (aligned_len - keylen) from the keylen source buffer. Fix this by replacing kmemdup with kmalloc, followed by memcpy.

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/31022cfde5235c45fa765f0aabeff5f0652852f2 Patch
https://git.kernel.org/stable/c/80688afb9c35b3934ce2d6be9973758915e2e0ef Patch
https://git.kernel.org/stable/c/aa545df011338df13f0833fc1fabcb15c0521959 Patch
https://git.kernel.org/stable/c/c2fb4984fe09fc176fe4c12d5e3edf626df6511d Patch
https://git.kernel.org/stable/c/cebc5ebd958346195b77f42d0cd5141b4e448fae Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43330), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.