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CVE-2026-31705: 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: ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment smb2_get_ea() applies 4-byte alignment padding via memset() after writing each EA entry. The bounds check on buf_free_len is performed before the value memcpy, but the alignment memset fires unconditionally afterward with no check on remaining space. When the EA value exactly fills the remaining buffer (buf_free_len == 0 after value subtraction), the alignment memset writes 1-3 NUL bytes past the buf_free_len boundary. In compound requests where the response buffer is shared across commands, the first command (e.g., READ) can consume most of the buffer, leaving a tight remainder for the QUERY_INFO EA response. The alignment memset then overwrites past the physical kvmalloc allocation into adjacent kernel heap memory. Add a bounds check before the alignment memset to ensure buf_free_len can accommodate the padding bytes. This is the same bug pattern fixed by commit beef2634f81f ("ksmbd: fix potencial OOB in get_file_all_info() for compound requests") and commit fda9522ed6af ("ksmbd: fix OOB write in QUERY_INFO for compound requests"), both of which added bounds checks before unconditional writes in QUERY_INFO response handlers.

    Засегнати продукти

    • Linux Linux: 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 преди ddbbc8b2a09dd2cfed90871313e3691ae1db08a2; e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d преди ffbce350c6fd1e99116ea57383b9031717e36d3b; e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d преди 98f3de6ef4efbd899348d333f0902dc4ff14380c; e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d преди 790304c02bf9bd7b8171feda4294d6e62d32ae8f; e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d преди 922d48fe8c19f388ffa2f709f33acaae4e408de2; e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d преди 30010c952077a1c89ecdd71fc4d574c75a8f5617; f2283680a80571ca82d710bc6ecd8f8beac67d63; 6.1.71 преди 6.1.175; 5.15.145 преди 5.16
    • Linux Linux: 6.6; преди 6.6; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.84 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31705: Linux | freedomonline.bg