CVE-2026-31637Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking w…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: reject undecryptable rxkad response tickets
rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() 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.
linux_kernel >= 2.6.22.1, < 6.6.135linux_kernel >= 6.7, < 6.12.82linux_kernel >= 6.13, < 6.18.23linux_kernel >= 6.19, < 6.19.13linux_kernel = 2.6.22linux_kernel = 7.0Upgrade past the affected range:
linux_kernel 6.19.13Connected by shared product, vendor, weakness, or advisory.
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