SB2026072121 - Type Confusion in Linux kernel crypto nx driver
Published: July 21, 2026
Security Bulletin ID
SB2026072121
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) Type Confusion (CVE-ID: CVE-2026-63805)
CWE-ID: CWE-843 - Type confusion
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 a type confusion in nx_crypto_ctx_exit in the nx crypto driver when releasing AF_ALG-backed crypto contexts. A local user can trigger the vulnerable cleanup path to cause a denial of service.
The issue can be reached when AF_ALG is used opportunistically during local operations such as closing a socket.
Remediation
Install update from vendor's website.