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CVE-2026-89712: 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: NFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock nfsd4_ssc_expire_umount() walks nn->nfsd_ssc_mount_list with list_for_each_entry_safe(ni, tmp, ...). For each expired entry it sets nsui_busy = true, drops nfsd_ssc_lock to run mntput() on the source vfsmount, then reacquires the lock to list_del + kfree the entry and continue iterating via the macro's saved tmp pointer. The nsui_busy flag protects the current ni from concurrent nfsd4_ssc_setup_dul() finders during the lock-drop window, but it does not pin tmp. Another nfsd RPC thread that fails its source- server mount and reaches nfsd4_ssc_cancel_dul() will, during that same window, take nfsd_ssc_lock, list_del + kfree its own ssc_umount item, and release the lock. If that item is the saved tmp of the expire walk, the next iteration dereferences a freed nfsd4_ssc_umount_item. Restart the walk from the head after the mntput() unlock window so no saved next pointer survives the lock-drop. The list is bounded by the number of active inter-server source mounts (typically small) and the expire delayed-work runs periodically rather than per-IO, so the restart is cheap.

    Засегнати продукти

    • Linux Linux: a4bc287943f5695209ff36bdc89f17b48d68fae7 преди 2b59029b8f24a99b5d844af2da3950d39d36eeea; f4e44b393389c77958f7c58bf4415032b4cda15b преди d9e151fea5ed706c1284adacabd869b0be745db2; f4e44b393389c77958f7c58bf4415032b4cda15b преди 659ee3da073164e1e6e40dfcbc26eeed85845f93; f4e44b393389c77958f7c58bf4415032b4cda15b преди 60680ae7243b22de3d09be990d8e23bcfc4af837; f4e44b393389c77958f7c58bf4415032b4cda15b преди 77de363d9a1c8cd35f20482782c612cda085791a; f4e44b393389c77958f7c58bf4415032b4cda15b преди 4ed8d2317aef21cc2a9e5a55d6b59860b4b151a8; f4e44b393389c77958f7c58bf4415032b4cda15b преди 7377fa964b8aaf47cb04e5efcc4c82d15e8c2ce9; f4e44b393389c77958f7c58bf4415032b4cda15b преди 036c1b182f4da65363e79ec0ac276edc6b7296e5; 5.10.220 преди 5.10.270
    • Linux Linux: 5.14; преди 5.14; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 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

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89712: Linux | freedomonline.bg