SB20260828138 - Out-of-bounds read in Linux kernel btrfs
Published: August 28, 2026
Security Bulletin ID
SB20260828138
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) Out-of-bounds read (CVE-ID: CVE-2026-80631)
CWE-ID: CWE-125 - Out-of-bounds read
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 attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in lzo_decompress_bio() in the Btrfs LZO decompression logic when processing a crafted compressed extent. A local attacker can supply a crafted compressed segment length that extends beyond the compressed input to cause a denial of service.
Remediation
Install update from vendor's website.