CVE-2026-31637

rxkaddecryptticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether cryptoskcipherdecrypt() succeeded.

A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes.

Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31637.json",
    "cna_assigner": "Linux"
}

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

17926a79320afa9b95df6b977b40cca6d8713cea

Fixed

47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a

Fixed

a149dcae23309df9de1c3b6b5d468610ef5ab7de

Fixed

22f6258e7b31dba9bf88dce4e3ee7f0f20072e60

Fixed

58fcd1b156152613ba00a064a129fb69507ddd7d

Fixed

fe4447cd95623b1cfacc15f280aab73a6d7340b2

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31637.json"

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.6.22

Fixed

6.6.135

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.82

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.18.23

Type: ECOSYSTEM
Events: Introduced

6.19.0

Fixed

6.19.13

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31637.json"