CVE WatchOct 15, 2026

CVE-2026-46033

In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject short ahash digests during instance creatio

CVSS

7.1

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: May 27, 2026 · Last modified: Oct 15, 2026 · CWE-125 · CWE-1284

EPSS · 30d

0.1%EPSS · 30 days0.2%

2026-09-282026-10-26

Technical description

In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject short ahash digests during instance creation authencesn requires either a zero authsize or an authsize of at least 4 bytes because the ESN encrypt/decrypt paths always move 4 bytes of high-order sequence number data at the end of the authenticated data. While crypto_authenc_esn_setauthsize() already rejects explicit non-zero authsizes in the range 1..3, crypto_authenc_esn_create() still copied auth->digestsize into inst->alg.maxauthsize without validating it. The AEAD core then initialized the tfm's default authsize from that value. As a result, selecting an ahash with digest size 1..3, such as cbcmac(cipher_null), exposed authencesn instances whose default authsize was invalid even though setauthsize() would have rejected the same value. AF_ALG could then trigger the ESN tail handling with a too-short tag and hit an out-of-bounds access. Reject authencesn instances whose ahash digest size is in the invalid non-zero range 1..3 so that no tfm can inherit an unsupported default authsize.

Official references

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