PT-2024-11262 · Linux+2 · Linux Kernel+2

Syzbot · Published 2021-06-02 · Updated 2025-06-18 · CVE-2021-47255

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 (affected versions not specified)

Description The issue is related to the Linux kernel, where an access to bytes 4 through 15 of an APIC register may cause undefined behavior. This access in kvm lapic reg read can result in a leak of kernel stack contents. The problem occurred after a guard was removed in a commit. The SDM states that such access must not be executed.

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

Weakness Enumeration

CWE-402

Related Identifiers

BDU:2025-13745

CVE-2021-47255

OPENSUSE-SU-2024_2185-1

SUSE-SU-2024:2010-1

SUSE-SU-2024:2183-1

SUSE-SU-2024:2185-1

SUSE-SU-2025:01995-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 573

• https://ubuntu.com/security/CVE-2021-47255 · Vendor Advisory
• https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84 · Patch
• https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2185-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47255 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2183-1 · Vendor Advisory
• https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2010-1 · Vendor Advisory
• https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5 · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-47255 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:01995-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-13745 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47255 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47255 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47255 · Security Note