PT-2021-8013 · Linux · Linux Kernel

Xiao Ni · Published 2021-04-26 · Updated 2025-01-09 · CVE-2021-47066

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the async xor function in the Linux kernel, which can cause data corruption problems due to incorrect calculation of xor values when sharing one page if PAGE SIZE is not equal to stripe size. In RMW mode, the parity page is used as a source page, and the ASYNC TX XOR DROP DST flag is set before calculating the xor value in ops run prexor5. However, it only needs src list, resulting in incorrect xor values. This problem can be reproduced on a POWER8 machine using specific steps, including creating a RAID device, formatting it with XFS, and mounting it.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-119

CWE-222

Related Identifiers

BDU:2024-01830

CVE-2021-47066

Affected Products

Linux Kernel

References · 22

• https://nvd.nist.gov/vuln/detail/CVE-2021-47066 · Security Note
• https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-47066 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47066 · Vendor Advisory
• https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 · Patch
• https://bdu.fstec.ru/vul/2024-01830 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47066 · Security Note
• https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 · Patch
• https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af · Patch
• https://ubuntu.com/security/CVE-2021-47066 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47066 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47066 · Vendor Advisory
• https://git.kernel.org/linus/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 · Note
• https://lore.kernel.org/linux-cve-announce/2024022954-CVE-2021-47066-02e0@gregkh/T/#u · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47066 · Note