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CVE-2026-89706: 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, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: nfsd: Reset write verifier when async COPY writeback fails Async COPY captures nn->writeverf at request time and reports it to the client via CB_OFFLOAD after the worker kthread completes. When the post-copy vfs_fsync_range() or filemap_check_wb_err() in _nfsd_copy_file_range() reports an error, the worker correctly leaves NFSD4_COPY_F_COMMITTED clear so that CB_OFFLOAD encodes wr_stable_how as NFS_UNSTABLE, but the server's write verifier is not rotated. A client that receives NFS_UNSTABLE in CB_OFFLOAD follows up with COMMIT to make the copied data durable. With the verifier unchanged, COMMIT returns the same value the client just received via CB_OFFLOAD, and the client concludes the copy is durable -- silently dropping the data whose writeback in fact failed. This violates the UNSTABLE+COMMIT durability contract (RFC 7862 section 15.1, RFC 8881 section 18.32) and matches the bug just fixed in nfsd_vfs_write() and nfsd_commit(). Rotate nn->writeverf at the writeback-failure site. The async COPY worker has no svc_rqst, so commit_reset_write_verifier() is not available here; calling nfsd_reset_write_verifier() directly mirrors the trace-less reset already used by nfsd_file_check_write_error() for the same purpose. Filter out -EAGAIN and -ESTALE, matching commit_reset_write_verifier(), since neither indicates a durable-storage failure.

    Засегнати продукти

    • Linux Linux: 817c6eb975798647c4bbbfc9eb288aa413ec7f65 преди cc5f7cef0659a27c13dd33edd8e2f79257b095c6; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди c6d2f6372c7e0f76b9c148ff7696aec64da0b5b7; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди 8a08ffe73eb2aa6bc6f88763da7e2b55bab6493a; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди 6b13d26cc21b6320a3c61d5e4cee2ce9a589b181; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди 31d4d0a62ec4bafbcdbad142f11ab1f90794b1d0; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди 591134e059e3456180244a826d6917cdc183140b; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди bf0cd31a9abcb728c17d79b4c2cc533612a8b6af; eac0b17a77fbd763d305a5eaa4fd1119e5a0fe0d преди f5cb2276954cb80987a93ef9f9dfbfdbfc0f10b9; 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-2026-89706: Linux | freedomonline.bg