PT-2025-25881 · Linux+1 · Linux Kernel+1

Published 2022-08-26 · Updated 2026-04-20 · CVE-2022-49955

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 versions prior to 6.0.0-rc2-00433-gede0a8d3307a

Description A vulnerability in the Linux kernel has been resolved, related to the handling of MSR[HV] when entering RTAS (firmware) on IBM Cell machines. This issue caused crashes due to incorrect MSR handling. The problem occurred because the semi-recent changes to MSR handling when entering RTAS caused the kernel to attempt to execute user pages, leading to crashes. The fix involves copying the MSR[HV] bit from the MSR value read using mfmsr into the value used for RTAS.

Recommendations For Linux kernel versions prior to 6.0.0-rc2-00433-gede0a8d3307a, apply the fix by updating the kernel to a version that includes the corrected RTAS MSR[HV] handling for Cell. As a temporary workaround, consider disabling the use of RTAS on IBM Cell machines until a patched kernel version is available.

Exploit

Fix

NULL Pointer Dereference

Improper Resource Release

Weakness Enumeration

CWE-476

CWE-404

Related Identifiers

BDU:2026-02036

CVE-2022-49955

Affected Products

Astra Linux

Linux Kernel

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49955.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-49955 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-49955 · Security Note
• https://git.kernel.org/stable/c/91926d8b7e71aaf5f84f0cf208fc5a8b7a761050 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2022-49955 · Security Note
• https://osv.dev/vulnerability/CVE-2022-49955 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-02036 · Security Note
• https://git.kernel.org/stable/c/8b08d4f97233d8e58fff2fd9d5f86397a49733c5 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-49955 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2022-49955 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2022-49955 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-49955 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.8 · Note
• https://access.redhat.com/security/cve/cve-2022-49955 · Note