CVE-2023-52669: crypto: s390/aes - Fix buffer overread in CTR mode

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-17 · updated 2026-08-04
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: s390/aes - Fix buffer overread in CTR mode When processing the last block, the s390 ctr code will always read a whole block, even if there isn't a whole block of data left. Fix this by using the actual length left and copy it into a buffer first for processing.

Affected products

Debian Linux: 10.0
Linux kernel: from 3.0 before 5.10.210; from 5.11 before 5.15.149; from 5.16 before 6.1.76; from 6.2 before 6.6.15; from 6.7 before 6.7.3 — fixed in 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.210, 5.15.149, 6.1.76, 6.6.15. Check the vendor advisory for mitigations.

References

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