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CVE-2026-89547: Linux

8.1

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 без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Check svc pool percpu counter allocation __svc_create() initializes three per-pool percpu_counter stats and ignores every return value. On SMP, percpu_counter_init() fails when __alloc_percpu_gfp() cannot satisfy the allocation, leaving the failed counter with fbc->counters == NULL and its embedded raw_spinlock_t, list_head, and count never initialized. __svc_create() returns the half-constructed svc_serv to nfsd, lockd, or the NFS callback service anyway. Once that service is live, the hot-path increments in svc_xprt_enqueue(), svc_handle_xprt(), and svc_pool_wake_idle_thread() reach a counter whose backing pointer is NULL. The pointer is a per-cpu offset, so the access does not fault: it resolves to offset zero of the current CPU's per-cpu area and silently corrupts whatever variable lives there. A /proc/fs/nfsd/pool_stats read walks the same NULL per-cpu storage and returns garbage, and on CONFIG_DEBUG_SPINLOCK or lockdep it splats on the never-initialized lock. Creating the broken service requires a percpu allocation failure during RPC server startup, so it is reachable only by a local administrator under memory pressure or fault injection; a remote peer cannot induce the bad state on its own. Check each percpu_counter_init() return value in __svc_create() and fail when an allocation fails, unwinding the counters already set up in the current pool and in every pool initialized before it. A discrete percpu_counter_destroy() per counter at teardown frees each per-cpu allocation exactly once.

    Засегнати продукти

    • Linux Linux: ccf08bed6e7a80519569456edd2ea21b7b1701c6 преди 57ac7d899409b0a9b768cf417e3bb86bcca3d4c6; ccf08bed6e7a80519569456edd2ea21b7b1701c6 преди 3a2b7649de76376a69f1d3ed2a539fb15907cd4d; ccf08bed6e7a80519569456edd2ea21b7b1701c6 преди bd1ef2cfb44d72b7aa6943e87b206eb0e30fbd0c; ccf08bed6e7a80519569456edd2ea21b7b1701c6 преди b541a15046976e481618726cc23db0fb22d576db; ccf08bed6e7a80519569456edd2ea21b7b1701c6 преди 43e11e164704dde975c9edb370de1a06bec67270
    • Linux Linux: 6.3; преди 6.3; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

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