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CVE-2026-31696: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди 44714dfda386884919ba366411880b6fb3c3efd3; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди 41a117dd80371343babc52198d1114e83eb37627; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди 9a397aa9b5e53ca63d4d6aefb542832eca389618; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди 1fa36cf495b0023e8475d038535c05e4063211e1; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди 4458757c020592a3094366e0fb20457383b42f92; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди ce383ba615339f8eaec646a166d2c2b015bb5ca0; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди a1be1c9ece26cea69654f28b255ff9a7906b897b; 8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247 преди ac33733b10b484d666f97688561670afd5861383
    • Linux Linux: 3.17; преди 3.17; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.84 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31696: Linux | freedomonline.bg