SB2026090558 - Race condition in Linux kernel hv driver
Published: September 5, 2026
Security Bulletin ID
SB2026090558
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-80896)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause list corruption.
The vulnerability exists due to improper synchronization and improper list-node state handling in mshv_irqfd_deassign() and mshv_irqfd_deactivate() when concurrently deassigning irqfds and processing EPOLLHUP events. A local user can trigger repeated removal of the same irqfd list node to cause list corruption.
Remediation
Install update from vendor's website.