CVE-2021-29657

Katalog CVE

CVSS 7.4 · High EPSS 0,42%

Kerentanan Time-of-check Time-of-use (TOCTOU) Race Condition pada linux kernel. Skor CVSS 3.1 7.4 (High) menurut NVD.

Deskripsi (NVD)

arch/x86/kvm/svm/nested.c in the Linux kernel before 5.11.12 has a use-after-free in which an AMD KVM guest can bypass access control on host OS MSRs when there are nested guests, aka CID-a58d9166a756. This occurs because of a TOCTOU race condition associated with a VMCB12 double fetch in nested_svm_vmrun.

Rincian

Terbit di NVD

22 Juli 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-416: Use After Free

EPSS (30 hari)

0,42% peluang dieksploitasi; lebih tinggi dari 34,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12 exploit · patch · advisory vendor
• https://bugs.chromium.org/p/project-zero/issues/detail?id=2177 exploit · mailing list · patch · advisory pihak ketiga
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f59323259... patch · advisory pihak ketiga
• http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html advisory pihak ketiga · vdb entry
• https://security.netapp.com/advisory/ntap-20210902-0008/ advisory pihak ketiga