SB20261022434 - Deadlock in Linux kernel mm
Published: October 22, 2026
Security Bulletin ID
SB20261022434
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) Deadlock (CVE-ID: CVE-2026-98818)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service through a kernel deadlock.
The vulnerability exists due to improper lock ordering in the Linux kernel SLUB allocator when kfree_rcu() allocates memory with __GFP_KSWAPD_RECLAIM while holding the scheduler's pi_lock. A local user can trigger an affected allocation path that attempts to wake kswapd, which also requires pi_lock, to potentially cause a deadlock and render the system unresponsive.
Remediation
Install update from vendor's website.