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CVE-2026-99225: Linux

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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: keys: Check the authorization payload in process keyring searches An authorization payload and its saved credentials must remain valid while search_process_keyrings_rcu() searches the requestor's keyrings. The function validates the authorization key, then separately loads payload.data[0] and unconditionally reads rka->cred. Validation does not prevent request_key_auth_revoke() from clearing the payload. A request-key helper can assume authority and fork a descendant that inherits the authorization key. If the descendant misses in its own keyrings, it falls back to the saved requestor credentials. Successful target instantiation invalidates the authorization key without clearing the payload. After the helper exits, UMH_WAIT_PROC returns to the requester, which calls complete_request_key() and revokes that key. With the descendant paused after validation, the paths can interleave as follows: 1. The descendant enters search_process_keyrings_rcu() under RCU and key_validate() succeeds. 2. The helper instantiates the target, invalidates the authorization key, and exits. 3. The requester resumes from UMH_WAIT_PROC, calls complete_request_key(), and revokes the authorization key. request_key_auth_revoke() sets its payload pointer to NULL. 4. The descendant loads NULL and dereferences rka->cred. This NULL dereference can oops the kernel. RCU delays payload disposal but does not prevent the pointer from being cleared. Load the payload with dereference_key_rcu() and require a non-NULL result before validating the authorization key and searching its saved credentials. A non-NULL payload and its credentials remain alive for the caller's RCU read-side section; a cleared payload skips the fallback search and follows the existing error selection. KASAN report as below: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASA

    Засегнати продукти

    • Linux Linux: e59428f721ee096d8a020504ea908a6f0d952735 преди 14fb6fad526b35a7ebd121f1dd313abe652e0aa6; e59428f721ee096d8a020504ea908a6f0d952735 преди 458cf9715af6aff3ac8d2ec60bd59e9d6236fd0f; e59428f721ee096d8a020504ea908a6f0d952735 преди 7d3d2fffe933e538472ccafe5bbc7109488b9ce3; e59428f721ee096d8a020504ea908a6f0d952735 преди 26949c2e4c461e9e620e935bc22717f36a40b615; e59428f721ee096d8a020504ea908a6f0d952735 преди 984a178d54515779a1bee100b92a6cee8777c830; e59428f721ee096d8a020504ea908a6f0d952735 преди b86db7993051d05810601654e886a1e78e1fa495; e59428f721ee096d8a020504ea908a6f0d952735 преди b4dfda438fee3c6faa15d9b421c373de6a0e476f; e59428f721ee096d8a020504ea908a6f0d952735 преди 49f4e768540d25d8852ef750313afda6a4774871; e59428f721ee096d8a020504ea908a6f0d952735 преди 0a0ec45bf577a9b4d4960567f20d3877ef480de9
    • Linux Linux: 5.3; преди 5.3; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.161 до 6.6.*; 6.12.115 до 6.12.*; 6.18.60 до 6.18.*; 7.2.14 до 7.2.*; 7.3.1 до 7.3.*; от 7.4-rc1 нататък

    История

    • 2 ноември 2026 Публикувано

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    CVE-2026-99225: Linux | freedomonline.bg