SB2026091888 - Incorrect Conversion between Numeric Types in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB2026091888
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) Incorrect Conversion between Numeric Types (CVE-ID: CVE-2026-93127)
CWE-ID: CWE-681 - Incorrect Conversion between Numeric Types
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 cause an out-of-bounds access.
The vulnerability exists due to improper scalar identifier handling in the BPF verifier when processing sign-extending narrowing fills from spilled scalar stack slots. A local user can load a BPF program that combines sign-extending and zero-extending fills of the same stack slot to cause an out-of-bounds access.
Remediation
Install update from vendor's website.