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CVE-2026-89682: 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: nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net nfsd_file_dispose_list_delayed() defers fput() to nfsd service threads via a per-net freeme queue, preventing the shrinker and GC worker from bearing the cost of closing files (see ffb402596147). However, the queue lives in a separately-allocated struct nfsd_fcache_disposal that is freed by nfsd_free_fcache_disposal_net() during per-net teardown. The global shrinker, laundrette, and fsnotify callbacks can still be inside nfsd_file_dispose_list_delayed() dereferencing that pointer, causing a use-after-free. Inline the spinlock and freeme list directly into struct nfsd_net (as fcache_dispose_lock and fcache_dispose_list), eliminating the separately allocated struct nfsd_fcache_disposal entirely. These fields now have the same lifetime as the net namespace itself, so there is no dangling pointer to chase. nfsd_file_cache_start_net() now just initializes the inline fields and cannot fail due to allocation. nfsd_file_cache_shutdown_net() drains the inline list directly instead of freeing a separate struct. The alloc/free helpers are removed.

    Засегнати продукти

    • Linux Linux: 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди 41fe0e804bbf1110c0aba2ebdfc729efb240d8a6; 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди e6c3a43d0a41f03abae3764fc82a59369360c7e0; 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди 9c8ac7c2b9b150e13b7ad0d0fae54f17747dce67; 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди ba0ee9e04b7a0356c28d5a2fe445db675d24e572; 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди cadc9036d5a8209f89e7026ddba7cfb1c716b03c; 1463b38e7cf34d4cc60f41daff459ad807b2e408 преди bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4; e8f923e1e9fcc0832a12c8a2461792e5a9544c03; 3bc94fb44f10ef852723e1aeaac6794c5ab16aec; 5.10.220 преди 5.11; 5.15.154 преди 5.16
    • Linux Linux: 5.17; преди 5.17; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.51 до 6.18.*; 7.2.4 до 7.2.*; 7.3 до *

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89682: Linux | freedomonline.bg