Answer in brief
CVE-2026-31637 records a Critical severity (CVSS 9.8) vulnerability in rxrpc: reject undecryptable rxkad response tickets. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=17926a79320afa9b95df6b977b40cca6d8713cea <252157d939d179b5d767cb860ff8fa7f8723b67a || >=17926a79320afa9b95df6b977b40cca6d8713cea <a75b3b361dd481d942c5f259a82d59718a41092c || >=17926a79320afa9b95df6b977b40cca6d8713cea <b3a808cd0790b5075aaa2bc3588edf02cd71d352 || >=17926a79320afa9b95df6b977b40cca6d8713cea <47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a || >=17926a79320afa9b95df6b977b40cca6d8713cea <a149dcae23309df9de1c3b6b5d468610ef5ab7de || >=17926a79320afa9b95df6b977b40cca6d8713cea <22f6258e7b31dba9bf88dce4e3ee7f0f20072e60 || >=17926a79320afa9b95df6b977b40cca6d8713cea <58fcd1b156152613ba00a064a129fb69507ddd7d || >=17926a79320afa9b95df6b977b40cca6d8713cea <fe4447cd95623b1cfacc15f280aab73a6d7340b2 | 252157d939d179b5d767cb860ff8fa7f8723b67a, a75b3b361dd481d942c5f259a82d59718a41092c, b3a808cd0790b5075aaa2bc3588edf02cd71d352, 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8a, a149dcae23309df9de1c3b6b5d468610ef5ab7de, 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60, 58fcd1b156152613ba00a064a129fb69507ddd7d, fe4447cd95623b1cfacc15f280aab73a6d7340b2 |
| Linux/Linuxgeneric | 2.6.22 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.