SB2026111103 - Double free in Linux kernel net xen-netback driver
Published: November 11, 2026
Security Bulletin ID
SB2026111103
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Double free (CVE-ID: CVE-2026-99287)
CWE-ID: CWE-415 - Double Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to potentially cause a denial of service.
The vulnerability exists due to a double-free condition in the Linux kernel xen-netback driver when cleaning up a failed frontend data-ring mapping operation. A local user can trigger a mapping failure after a ring is already mapped to potentially cause a kernel crash through repeated unmapping of the same ring memory.
Remediation
Install update from vendor's website.