CVE-2026-46033
7.1 HIGHIn the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject short ahash digests during instance crea...
Published: 2026-05-27 · Last updated: 2026-06-16
Severity and scoring
- CVSS
- 7.1 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CWE
- CWE-125
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-46033
- [Patch]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
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