CVE-2026-43033: crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-01 · updated 2026-10-19
Weakness: CWE-682

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption When decrypting data that is not in-place (src != dst), there is no need to save the high-order sequence bits in dst as it could simply be re-copied from the source. However, the data to be hashed need to be rearranged accordingly. Thanks,

Affected products

Linux kernel: from 4.3 before 5.10.254; from 5.11 before 5.15.204; from 5.16 before 6.1.170; from 6.2 before 6.6.137; from 6.7 before 6.12.85; from 6.13 before 6.18.22 — fixed in 5.10.254, 5.15.204, 6.1.170, 6.12.85, 6.18.22, 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.254, 5.15.204, 6.1.170, 6.12.85. Check the vendor advisory for mitigations.

References

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