PT-2024-11268 · Linux+1 · Linux Kernel+1

Published 2021-06-08 · Updated 2024-11-04 · CVE-2021-47262

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.13.0

Description The issue is related to the KVM: x86 component of the Linux kernel, where a bug existed since the tracepoint was added, but was recently exposed by a new check in tracing to detect exactly this type of bug. The bug is caused by the fact that the tracepoint itself is defined by kvm, and if kvm-intel and/or kvm-amd are built as modules, the memory holding the string literals defined by the vendor modules will be freed when the module is unloaded, whereas the tracepoint and its data in the ring buffer will live until kvm is unloaded. This can lead to the tracepoint outliving the data/memory it consumes and deferencing stale memory.

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

Weakness Enumeration

CWE-99

Related Identifiers

BDU:2025-07337

CVE-2021-47262

Affected Products

Astra Linux

Linux Kernel

References · 20

• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47262 · Vendor Advisory
• https://git.kernel.org/stable/c/f31500b0d437a2464ca5972d8f5439e156b74960 · Patch
• https://git.kernel.org/stable/c/796d3bd4ac9316e70c181189318cd2bd98af34bc · Patch
• https://ubuntu.com/security/CVE-2021-47262 · Vendor Advisory
• https://git.kernel.org/stable/c/d046f724bbd725a24007b7e52b2d675249870888 · Patch
• https://git.kernel.org/stable/c/9fb088ce13bc3c59a51260207b487db3e556f275 · Patch
• https://bdu.fstec.ru/vul/2025-07337 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47262 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47262 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47262 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47262 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47262 · Vendor Advisory
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.44 · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.126 · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11 · Note