CVE-2026-52959

Katalog CVE

CVSS 7.8 · High EPSS 0,11%

Kerentanan pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut CNA.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Juni 2026

Terakhir diubah

14 Juli 2026

Status NVD

Analyzed

CVSS 3.1

7.8 (High), sumber CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

EPSS (30 hari)

0,11% peluang dieksploitasi; lebih tinggi dari 1,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/23e6a1ca04ae44806439a5a446e62e4d42e80bb4 patch
• https://git.kernel.org/stable/c/3f6fb0211b39aaa1b841260681dd02ca6b693ed5 patch
• https://git.kernel.org/stable/c/9e48b4f813d2c3db75d522aa82ab705ce04b7e2d patch