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CVE-2026-46033crypto: authencesn - reject short ahash digests during instance creation

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.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 6 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-46033, by who scored it
Scored byCVSSScoreVector
redhat-SADPADP (enrichment)3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVDNVD · Modified3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS (exploitation in 30 days)
0.14% · top 97% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

  • Linux · Linux

    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < 77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < 2f31cd1e64a079c845bca31d2da7b3c90a311726
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < b69933e97efea238ebbfcf70c2b1be1cd03f13e3
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < 67f1f0933cc3d78dde222842bcad2778ec7a0b88
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < b42821c15445f93daea3e76ada682b2b7181c476
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < 9aff81e8217e9de2929084b03b3c7f81988c112b
    • affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd – < 5db6ef9847717329f12c5ea8aba7e9f588a980c0

  • Linux · Linux

    • affected 4.11
    • unaffected < 4.11
    • unaffected 5.10.258 – ≤ 5.10.*
    • unaffected 5.15.209 – ≤ 5.15.*
    • unaffected 6.1.175 – ≤ 6.1.*
    • unaffected 6.6.140 – ≤ 6.6.*
    • unaffected 6.12.86 – ≤ 6.12.*
    • unaffected 6.18.27 – ≤ 6.18.*
    • unaffected 7.0.4 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References14

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .