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CVE-2026-98173: Linux

7.5

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, при специфични условия, без вход и след действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free of iface in cifs_try_adding_channels() cifs_try_adding_channels() iterates ses->iface_list with list_for_each_entry_safe_from(), which captures the next entry (niface) under iface_lock. The loop body then drops iface_lock for the whole duration of cifs_ses_add_channel(). A concurrent interface refresh (SMB3_request_interfaces() -> parse_server_interfaces()) marks all ifaces inactive and removes and frees any that are not re-advertised via list_del() + kref_put(), where release_iface() is a bare kfree(). Since niface typically has no channel holding a reference, the list reference is its last and it can be freed inside the unlocked window. On continue, the iterator advance step then dereferences niface->iface_head.next, and the loop body reads iface->rdma_capable/is_active, both on freed memory. Fix this by never keeping an unreferenced list pointer across the unlocked window. Each channel attempt now re-scans the list from the head under iface_lock, takes a kref on the selected candidate, and passes only that referenced candidate to cifs_ses_add_channel(). weight_fulfilled still tracks selection progress, so restarting the scan preserves the original weighted distribution and the weight_fulfilled-before-kref_put ordering on the failure path. Add a per-pass attempts cap so a flapping interface refresh cannot keep the inner loop spinning within a single tries increment.

    Засегнати продукти

    • Linux Linux: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди 93e8a49adb2a575202c5ee766435eff2f9f95f5b; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди ee0d8f83d68f6e6509f092c997ccab3c8c801538; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди c941f1ebfd26f683de81091473f3596a218abff0; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди e99040e5e9c60441e6b4725e1a7b88c3106ae903; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди ec36b38e65596950e6c29bed7dfc90b98707c19c; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec преди d034e836eefd7ce75e588f7031cffbeec594f5ac
    • Linux Linux: 5.19; преди 5.19; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.112 до 6.12.*; 6.18.54 до 6.18.*; 7.2.8 до 7.2.*; 7.3 до *

    История

    • 6 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98173: Linux | freedomonline.bg