PT-2026-37589 · Linux · Linux Kernel

CVE-2026-43249 · Published 2026-05-06 · Updated 2026-07-10

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:A/AC:L/PR:N/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 race condition exists where the xenwatch thread can conflict with other back-end change notifications. This may lead to the xen 9pfs front free() function being called twice, resulting in a double-free (a situation where memory is released twice, which can corrupt memory management) and causing a general protection fault that crashes the system.

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

Exploit

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

CVE-2026-43249

SUSE-SU-2026:22108-1

SUSE-SU-2026:22137-1

SUSE-SU-2026:22433-1

SUSE-SU-2026:22458-1

SUSE-SU-2026:2482-1

SUSE-SU-2026:2591-1

USN-8492-1

USN-8492-2

USN-8492-3

USN-8492-4

USN-8492-5

USN-8497-1

USN-8498-1

USN-8499-1

Affected Products

Linux Kernel

References · 930

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43249.json · Exploit
• https://ubuntu.com/security/CVE-2026-22990 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23124 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8499-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45879 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71189 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71194 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23392 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43242 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23233 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43249 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23256 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23235 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43318 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71224 · Vendor Advisory