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CVE-2026-99040: 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: KEYS: Fix add_key() race with keyring restriction __key_create_or_update() snapshots keyring->restrict_link before taking the destination keyring's semaphore. keyring_restrict() installs a restriction while holding that semaphore. This allows a writer to observe no restriction, wait for the keyring owner to install a reject-all restriction and return successfully, and then link a key using the stale NULL snapshot. The writer only needs write permission on the destination keyring. Move the restrict_link read after __key_link_lock() and __key_link_begin(). The read and the subsequent restriction check are then serialized with restriction installation by keyring->sem. The race was reproduced on v7.2.8 in 19 executions where restriction installation returned before the link completed. All 19 linked the key despite the reject-all restriction. With this change, 312 executions reached the same ordering and every add_key() call failed with -EPERM. The issue was found by manual concurrency analysis assisted by AI-based analysis and independently verified with a QEMU reproducer and kernel instrumentation.

    Засегнати продукти

    • Linux Linux: 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди 24806fc9bca28fa1433bf938d1424dcb45d80e50; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди 9a5c2700336878465a630804a2d21864f22eca9c; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди b3e404550dc2b7f3d4bb64b1da8005a1fa9a798d; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди 305f1828b871dd46bf41addeb6f11d2c162dcb25; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди f99399b48e3edd6851fac34cd329bab9f1f33baf; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди 11516a0c402a6c1fa52254aa70d8d65fb921e59e; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди da0b595d8e6e2dd798f6e34e09dc51a13b888514; 5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c преди dd3ea3fcba7c75493760cdbccd35f029597e8d5e
    • Linux Linux: 4.7; преди 4.7; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.57 до 6.18.*; 7.2.11 до 7.2.*; от 7.3 нататък

    История

    • 23 октомври 2026 Публикувано

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    Първоизточници

    CVE-2026-99040: Linux | freedomonline.bg