Answer in brief
CVE-2026-31696 records a Unknown severity vulnerability in rxrpc: Fix missing validation of ticket length in non-XDR key preparsing. 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.
A CVSS score is not reported in the current record. 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 | >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <44714dfda386884919ba366411880b6fb3c3efd3 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <41a117dd80371343babc52198d1114e83eb37627 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <9a397aa9b5e53ca63d4d6aefb542832eca389618 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <1fa36cf495b0023e8475d038535c05e4063211e1 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <4458757c020592a3094366e0fb20457383b42f92 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <ce383ba615339f8eaec646a166d2c2b015bb5ca0 || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <a1be1c9ece26cea69654f28b255ff9a7906b897b || >=8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 <ac33733b10b484d666f97688561670afd5861383 | 44714dfda386884919ba366411880b6fb3c3efd3, 41a117dd80371343babc52198d1114e83eb37627, 9a397aa9b5e53ca63d4d6aefb542832eca389618, 1fa36cf495b0023e8475d038535c05e4063211e1, 4458757c020592a3094366e0fb20457383b42f92, ce383ba615339f8eaec646a166d2c2b015bb5ca0, a1be1c9ece26cea69654f28b255ff9a7906b897b, ac33733b10b484d666f97688561670afd5861383 |
| Linux/Linuxgeneric | 3.17 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
May 1, 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: Fix missing validation of ticket length in non-XDR key preparsing In rxrpc_preparse(), there are two paths for parsing key payloads: the XDR path (for large payloads) and the non-XDR path (for payloads <= 28 bytes). While the XDR path (rxrpc_preparse_xdr_rxkad()) correctly validates the ticket length against AFSTOKEN_RK_TIX_MAX, the non-XDR path fails to do so. This allows an unprivileged user to provide a very large ticket length. When this key is later read via rxrpc_read(), the total token size (toksize) calculation results in a value that exceeds AFSTOKEN_LENGTH_MAX, triggering a WARN_ON(). [ 2001.302904] WARNING: CPU: 2 PID: 2108 at net/rxrpc/key.c:778 rxrpc_read+0x109/0x5c0 [rxrpc] Fix this by adding a check in the non-XDR parsing path of rxrpc_preparse() to ensure the ticket length does not exceed AFSTOKEN_RK_TIX_MAX, bringing it into parity with the XDR parsing logic.
Quoted source text, attributed separately from HOL analysis.