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Vulnerability record · CVE-2026-46033 · published 27 May 2026

CVE-2026-46033: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 93.9% CWE-125 · Out-of-bounds readCWE-1284 · CWE-1284
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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/2f31cd1e64a079c845bca31d2da7b3c90a311726 Patch
https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0 Patch
https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88 Patch
https://git.kernel.org/stable/c/77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9 Patch
https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b Patch
https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476 Patch
https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3 Patch
https://git.kernel.org/stable/c/d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0 Patch
https://access.redhat.com/security/cve/CVE-2026-46033
https://bugzilla.redhat.com/show_bug.cgi?id=2482000
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46033.json

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Source: NIST National Vulnerability Database (record CVE-2026-46033), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.