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CVE-2026-89674: 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: fix XDR length calculation in nfsd4_ff_encode_layoutget The XDR buffer size calculation in nfsd4_ff_encode_layoutget() has multiple errors that can result in either an out-of-bounds write or leaking uninitialized kernel memory to the client: - fh_len doesn't account for XDR padding on the file handle data - uid and gid lengths use "8 + len" but xdr_encode_opaque() actually writes "4 + xdr_align_size(len)" bytes - ds_len omits the flags and stats_collect_hint fields (8 bytes), while len's header constant overestimates by 8 bytes -- these partially cancel but leave a net mismatch The worst case occurs with short strings (e.g. uid=0, gid=0 with an odd-sized file handle), where the function writes up to 5 bytes past the reserved XDR buffer. Conversely, when string lengths happen to be 4-byte aligned, the reservation is too large and stale buffer content is sent to the client. Fix this by breaking out every encoded field explicitly in the ds_len calculation, using xdr_align_size() for all variable-length opaque fields, and correcting the header constants.

    Засегнати продукти

    • Linux Linux: 9b9960a0ca4773e21c4b153ed355583946346b25 преди 3a7fd224df0fbb42167eb1b77be45d72fe0b1098; 9b9960a0ca4773e21c4b153ed355583946346b25 преди 29e4478e2ed5a227e8f0c33cacb91bf227cedd47; 9b9960a0ca4773e21c4b153ed355583946346b25 преди 65a72b721943618eeb3a41c8b36e915591f3f83f; 9b9960a0ca4773e21c4b153ed355583946346b25 преди bee826c00ac900473f91306f1f3e5a5a81fd4a74; 9b9960a0ca4773e21c4b153ed355583946346b25 преди e7d9d23ecd9172f05b09bb678ff22db8e361c428; 9b9960a0ca4773e21c4b153ed355583946346b25 преди 0380129b1373c437eb35401a174671c8888f4b80; 9b9960a0ca4773e21c4b153ed355583946346b25 преди c81cef6a805dec266c10fc4f83c93d6fcf1a2b43; 9b9960a0ca4773e21c4b153ed355583946346b25 преди f9868174af49d207fbaf0c5e055d088a983684af
    • Linux Linux: 4.8; преди 4.8; 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-2026-89674: Linux | freedomonline.bg