SB20260928203 - Signed to Unsigned Conversion Error in Linux kernel vdpa vdpa_sim driver
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928203
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) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-97990)
CWE-ID: CWE-195 - Signed to Unsigned Conversion Error
CVSSv4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information and cause a denial of service.
The vulnerability exists due to improper handling of signed return values in the vdpa_sim_net TX/RX processing path when handling a failed TX pull. A local user can trigger processing of a failed TX pull to disclose sensitive information and cause a denial of service.
Remediation
Install update from vendor's website.