CVE-2026-46033
published 2026-05-27CVE-2026-46033: In the Linux kernel, the following vulnerability has been resolved: crypto: authencesn - reject short ahash digests during instance creation authencesn…
high7
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.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < 77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9 | 77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < 2f31cd1e64a079c845bca31d2da7b3c90a311726 | 2f31cd1e64a079c845bca31d2da7b3c90a311726 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0 | d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < b69933e97efea238ebbfcf70c2b1be1cd03f13e3 | b69933e97efea238ebbfcf70c2b1be1cd03f13e3 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < 67f1f0933cc3d78dde222842bcad2778ec7a0b88 | 67f1f0933cc3d78dde222842bcad2778ec7a0b88 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < b42821c15445f93daea3e76ada682b2b7181c476 | b42821c15445f93daea3e76ada682b2b7181c476 |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < 9aff81e8217e9de2929084b03b3c7f81988c112b | 9aff81e8217e9de2929084b03b3c7f81988c112b |
| linux | linux | >= f15f05b0a5de667c821a9727c33bce9d1d9b26dd < 5db6ef9847717329f12c5ea8aba7e9f588a980c0 | 5db6ef9847717329f12c5ea8aba7e9f588a980c0 |
| linux | linux_kernel | — | — |