SB2026050989 - Use-after-free in Linux kernel mm
Published: May 9, 2026
Security Bulletin ID
SB2026050989
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) Use-after-free (CVE-ID: CVE-2026-43303)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the swap subsystem when handling stale page->private values on reallocated and split pages. A local user can trigger swapoff operations after causing affected page state reuse to cause a denial of service.
The issue occurs because tail pages can retain stale page->private values after split_page(), leading swap_count_continued() to follow an invalid continuation list and access poisoned list entries.
Remediation
Install update from vendor's website.