CVE-2020-29569

Katalog CVE

CVSS 8.8 · High EPSS 0,40%

Kerentanan Use After Free pada xen, linux kernel +4 lainnya. Skor CVSS 3.1 8.8 (High) menurut NVD.

Deskripsi (NVD)

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

Rincian

Terbit di NVD

15 Desember 2020

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-416: Use After Free

EPSS (30 hari)

0,40% peluang dieksploitasi; lebih tinggi dari 31,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://xenbits.xenproject.org/xsa/advisory-350.html patch · advisory vendor
• https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html mailing list · advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html mailing list · advisory pihak ketiga
• https://security.gentoo.org/glsa/202107-30 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210205-0001/ advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4843 advisory pihak ketiga