Out-of-bounds write in Xen - CVE-2026-62434
Published: July 29, 2026
Vulnerability identifier: #VU140014
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-62434
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to memory corruption in Xen memory management state when reclaiming special pages in populate-on-demand guests. A local user can attempt to reclaim pages that are not regular guest ram to cause a denial of service.
Only x86 HVM and PVH guests started in populate-on-demand mode are believed to be able to leverage the vulnerability.
How to mitigate CVE-2026-62434
Install security update from vendor's website.