SB2026091743 - Numeric Truncation Error in Linux kernel s390 kvm
Published: September 17, 2026
Security Bulletin ID
SB2026091743
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Numeric Truncation Error (CVE-ID: CVE-2026-89926)
CWE-ID: CWE-197 - Numeric Truncation Error
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a kernel warning.
The vulnerability exists due to numeric truncation in the KVM s390 __import_wp_info() function when importing user-supplied hardware breakpoint information. A local user can supply an oversized breakpoint length value to trigger a kernel warning.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a
- https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed
- https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454
- https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a
- https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900
- https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a
- https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722