SB2026081559 - Resource exhaustion in Linux kernel md driver
Published: August 15, 2026
Security Bulletin ID
SB2026081559
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) Resource exhaustion (CVE-ID: CVE-2026-74392)
CWE-ID: CWE-400 - Resource exhaustion
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 cause a denial of service.
The vulnerability exists due to improper resource management in dm_poll_bio() in the device mapper subsystem when polling target bios through a stacked dm device with io_uring IOPOLL. A local user can trigger repeated polling on a dm-stripe target to cause a denial of service.
The issue can keep a task inside the polling path long enough to trigger an RCU CPU stall.
Remediation
Install update from vendor's website.