Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before 77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before 2f31cd1e64a079c845bca31d2da7b3c90a311726; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before b69933e97efea238ebbfcf70c2b1be1cd03f13e3; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before 67f1f0933cc3d78dde222842bcad2778ec7a0b88; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before b42821c15445f93daea3e76ada682b2b7181c476; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before 9aff81e8217e9de2929084b03b3c7f81988c112b; affected f15f05b0a5de667c821a9727c33bce9d1d9b26dd before 5db6ef9847717329f12c5ea8aba7e9f588a980c0 |
| Linux / Linux | affected 4.11; unaffected 0 before 4.11; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/77f59fb2d3aa33e90ec6cbbf45dcfb20ab82b1a9
- https://git.kernel.org/stable/c/2f31cd1e64a079c845bca31d2da7b3c90a311726
- https://git.kernel.org/stable/c/d4c6a6d08e70bb1083c7c405fc7faacbf19aebc0
- https://git.kernel.org/stable/c/b69933e97efea238ebbfcf70c2b1be1cd03f13e3
- https://git.kernel.org/stable/c/67f1f0933cc3d78dde222842bcad2778ec7a0b88
- https://git.kernel.org/stable/c/b42821c15445f93daea3e76ada682b2b7181c476
- https://git.kernel.org/stable/c/9aff81e8217e9de2929084b03b3c7f81988c112b
- https://git.kernel.org/stable/c/5db6ef9847717329f12c5ea8aba7e9f588a980c0
ADP enrichment
A flaw was found in the Linux kernel's `authencesn` cryptographic module. This vulnerability arises from insufficient validation of cryptographic digest sizes during the creation of new instances. A local attacker could exploit this by providing a malformed input, leading to an out-of-bounds memory access. This could cause system instability, a denial of service (DoS), or potentially enable unauthorized access to sensitive information or system control.
No English description supplied.