PT-2021-4229 · Linux · Linux Kernel

Marek Marczykowski-Górecki · Published 2021-03-03 · Updated 2024-03-25 · CVE-2021-28039

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions 5.9.x through 5.11.3

Description The issue relates to misuse of guest physical addresses when a configuration has CONFIG XEN UNPOPULATED ALLOC but not CONFIG XEN BALLOON MEMORY HOTPLUG, allowing an x86 PV guest OS user to crash a Dom0 or driver domain via a large amount of I/O activity in some less-common configurations. This can lead to a denial of service.

Recommendations For Linux kernel versions 5.9.x through 5.11.3, consider disabling the CONFIG XEN UNPOPULATED ALLOC configuration option or enabling the CONFIG XEN BALLOON MEMORY HOTPLUG option as a temporary workaround to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-131

Related Identifiers

BDU:2021-04834

CVE-2021-28039

MGASA-2021-0117

MGASA-2021-0152

Affected Products

Linux Kernel

References · 37

• https://osv.dev/vulnerability/UBUNTU-CVE-2021-28039 · Vendor Advisory
• http://xenbits.xen.org/xsa/advisory-369.html · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-28039 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28039 · Security Note
• https://osv.dev/vulnerability/MGASA-2021-0117 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2021-0117.html · Security Note
• https://bdu.fstec.ru/vul/2021-04834 · Security Note
• http://openwall.com/lists/oss-security/2021/03/05/2 · Patch
• https://osv.dev/vulnerability/MGASA-2021-0152 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-28039 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-28039 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-28039 · Security Note
• https://advisories.mageia.org/MGASA-2021-0152.html · Security Note
• https://osv.dev/vulnerability/CVE-2021-28039 · Vendor Advisory
• https://bugs.mageia.org/show_bug.cgi?id=28541 · Note