SB20260912177 - Integer underflow in Linux kernel ecryptfs
Published: September 12, 2026
Security Bulletin ID
SB20260912177
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) Integer underflow (CVE-ID: CVE-2026-89606)
CWE-ID: CWE-191 - Integer underflow
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 an integer underflow.
The vulnerability exists due to an integer underflow in ecryptfs_parse_tag_70_packet() when parsing malformed tag 70 packets. A local user can provide a tag 70 packet with a body smaller than the required fixed metadata fields to trigger an integer underflow.
Remediation
Install update from vendor's website.