SB20260816135 - Improper input validation in Linux kernel keys
Published: August 16, 2026
Security Bulletin ID
SB20260816135
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) Improper input validation (CVE-ID: CVE-2026-74566)
CWE-ID: CWE-20 - Improper input validation
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 user to cause a denial of service.
The vulnerability exists due to improper input validation in the keyring subsystem when processing crafted key descriptions. A local user can add keys with specially crafted descriptions to cause a denial of service.
The issue affects in-memory ordering used to place keys within a keyring, allowing crafted descriptions to collide into one node.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3d9f16c0b643ceac305526b2e2fe25c2c6166926
- https://git.kernel.org/stable/c/58565eef0f8d861aae92abfb7658458d661cee17
- https://git.kernel.org/stable/c/7269df3e7fcfa308e6a456305162f7788747bdbd
- https://git.kernel.org/stable/c/7e5397a3fed0dee7779bd084bec3c0584db3c930
- https://git.kernel.org/stable/c/bd0f976ef89dce6db458bf75bc2cf51127becc41