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CVE-2026-52959: Linux

7.8

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 локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Do not use host-controlled page order in cleanup path When issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST), get_ext_report() allocates a buffer to retrieve a certificate blob from the host, keeping track of its size in report_req->certs_len. However, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating an invalid buffer size, as well as the expected length of such buffer. get_ext_report() subsequently updates report_req->certs_len with the host-controlled value, and cleans up the buffer by computing a page order from such value. This is incorrect, as the host-provided length may not match the page order of the original allocation, potentially resulting in corruption in the page allocator. Fix this by using alloc_pages_exact() instead, and reusing @npages to compute the size passed to free_pages_exact(). For consistency, also use @npages to compute the size when allocating the pages, even though this last change has no functional effect.

    Засегнати продукти

    • Linux Linux: 3e385c0d6ce88ac9916dcf84267bd5855d830748 преди 3f6fb0211b39aaa1b841260681dd02ca6b693ed5; 3e385c0d6ce88ac9916dcf84267bd5855d830748 преди 9e48b4f813d2c3db75d522aa82ab705ce04b7e2d; 3e385c0d6ce88ac9916dcf84267bd5855d830748 преди 23e6a1ca04ae44806439a5a446e62e4d42e80bb4; 0b16521f95c875e79d657cb8d6911c15080dbb80; 6.13.8 преди 6.14
    • Linux Linux: 6.14; преди 6.14; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; от 7.1 нататък

    История

    • 24 юни 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-52959: Linux | freedomonline.bg