CVE-2021-3656

Katalog CVE

CVSS 8.8 · High EPSS 0,66%

Kerentanan Missing Authorization pada linux kernel, fedoraproject fedora +21 lainnya. Skor CVSS 3.1 8.8 (High) menurut NVD.

Deskripsi (NVD)

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

Rincian

Terbit di NVD

4 Maret 2022

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-862: Missing Authorization

EPSS (30 hari)

0,66% peluang dieksploitasi; lebih tinggi dari 50,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD. Ditampilkan 60 dari 63 konfigurasi; daftar lengkap ada di NVD.

Referensi dan perbaikan

• https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc patch · advisory pihak ketiga
• https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc patch · advisory pihak ketiga
• https://bugzilla.redhat.com/show_bug.cgi?id=1983988 issue tracking · advisory pihak ketiga
• https://www.openwall.com/lists/oss-security/2021/08/16/1 mailing list · advisory pihak ketiga