PT-2025-7995 · Linux+2 · Linux Kernel+2

Kefeng Wang · Published 2022-04-07 · Updated 2025-10-14 · CVE-2022-49067

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 A vulnerability in the Linux kernel has been identified, specifically related to the virt addr valid() function on 64-bit Book3E and 32-bit systems. The issue arises because pa() returns 0 for vmalloc space addresses, causing virt to pfn() and subsequently virt addr valid() to return incorrect results. This can lead to bugs with hardened usercopy, as demonstrated by a BUG occurrence when running ethtool eth0 on 64-bit Book3E. The problem is caused by virt addr valid() returning true for vmalloc addresses that alias with a valid PFN. To fix this, extra checks have been added to virt addr valid() to ensure the virtual address is below high memory and above PAGE OFFSET for 64-bit systems, and similar checks are applied for 32-bit systems.

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

Exploit

Weakness Enumeration

CWE-388

Related Identifiers

BDU:2025-06039

CVE-2022-49067

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 22

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49067.json · Exploit
• https://git.kernel.org/stable/c/fddb88bd266f4513abab7c36bca98935c9148a98 · Patch
• https://git.kernel.org/stable/c/a3727c25eacd7e437c4f560957fa3a376fe93e6b · Patch
• https://security-tracker.debian.org/tracker/CVE-2022-49067 · Vendor Advisory
• https://git.kernel.org/stable/c/deab81144d5a043f42804207fb76cfbd8a806978 · Patch
• https://osv.dev/vulnerability/CVE-2022-49067 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-49067 · Vendor Advisory
• https://git.kernel.org/stable/c/ffa0b64e3be58519ae472ea29a1a1ad681e32f48 · Patch
• https://cve.org/CVERecord?id=CVE-2022-49067 · Security Note
• https://git.kernel.org/stable/c/cbc065efcba000ad8f615f506ebe61b6d3c5145b · Patch
• https://git.kernel.org/stable/c/d36febbcd537fcc50284e8b89609632d0146529f · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2022-49067 · Security Note
• https://bdu.fstec.ru/vul/2025-06039 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-49067 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-49067 · Vendor Advisory