PT-2025-18599 · Linux+2 · Linux Kernel+2

Published 2023-11-07 · Updated 2025-05-02 · CVE-2022-49882

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 resolved, related to the KVM (Kernel-based Virtual Machine) component. The issue arises when the gfn to pfn cache is inactive, and KVM fails to check the active flag during refresh, leading to potential use-after-free bugs. A race condition between KVM XEN ATTR TYPE SHARED INFO and KVM XEN HVM EVTCHN SEND can be exploited to trigger the bug. This can result in KVM ending up with a valid, inactive cache, causing errors such as consuming a NULL kernel pointer or missing an mmu notifier invalidation.

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

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2022-49882

RHSA-2023:6583

RHSA-2023_6583

Affected Products

Astra Linux

Linux Kernel

Red Hat

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49882.json · Exploit
• https://osv.dev/vulnerability/CVE-2022-49882 · Vendor Advisory
• https://git.kernel.org/stable/c/bfa9672f8fc9eb118124bab61899d2dd497f95ba · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-49882 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-49882 · Security Note
• https://git.kernel.org/stable/c/ecbcf030b45666ad11bc98565e71dfbcb7be4393 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-49882 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-49882 · Security Note
• https://ubuntu.com/security/CVE-2022-49882 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2022-49882 · Vendor Advisory
• https://git.kernel.org/linus/ecbcf030b45666ad11bc98565e71dfbcb7be4393 · Note
• https://lore.kernel.org/linux-cve-announce/2025050155-CVE-2022-49882-6046@gregkh/T · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/1917950838250881096 · Twitter Post