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CVE-2026-74628: Linux

9.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free of the socket by its timers The x25 timers are armed with mod_timer() and cancelled with timer_delete(), so a pending timer holds no reference on the socket and a cancel does not wait for a callback already running on another CPU. x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall sk->sk_timer after __x25_destroy_socket() has passed its cancel point. The following __sock_put() frees the socket while the timer is still queued, and the next expiry uses freed memory. KASAN reports a slab-use-after-free on the kmalloc-2k object freed by close(). timer_delete_sync() cannot be used here: x25_heartbeat_expiry() and x25_timer_expiry() both reach the cancels from inside the timer they would wait on, through __x25_destroy_socket() and x25_disconnect(). Arm the timers with sk_reset_timer() and cancel them with sk_stop_timer() so that an armed timer owns a reference, and release it in both expiry handlers. Rearm the heartbeat only while sk_hashed(sk) is still true, since __x25_destroy_socket() unlinks the socket before dropping it. Arm the deferred destroy timer the same way and drop its reference in x25_destroy_timer(). Reproduced on net with KASAN, with the heartbeat period shortened so the window recurs. With this patch the reproducer no longer triggers a report and /proc/net/x25 drains. Discovered by XBOW, triaged by Baul Lee <[email protected]>

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди ba925a2e98ce967a0e71c5bcbcf5dbd3facaf0c8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 6b79659590f0f82a9b8efd2ffd55ec6399ebfc33; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди fdd9ac50b9b61ef2b2d52c5156aff788be91454d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 1fc9f6d2c7c9fdb341bfe8ca449c990632299ea6; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 3c4919be5d910db4beebca420953858606fba7d8; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 4bc522b33438fefc3272840ae5988771863a4f1f; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди e92c7e2b41d1528a830bc64c5e4e46dfa8133dda; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 2195424c3da2ef1829a63b807e3a900a90e57d85
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.267 до 5.10.*; 5.15.217 до 5.15.*; 6.1.184 до 6.1.*; 6.6.153 до 6.6.*; 6.12.105 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; 7.2 до *

    История

    • 22 август 2026 Публикувано

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    Първоизточници

    CVE-2026-74628: Linux | freedomonline.bg