Vulnerability in Insyde Kernel
CVE-2022-33986
DMA attacks on the parameter buffer used by the VariableRuntimeDxe software SMI handler could lead to a TOCTOU attack. DMA attacks on the parameter buffer used by the software SMI handler used by the driver VariableRuntimeDxe could lead to a TOCTOU attack on the SMI handler and lead to corruption of SMRAM. This issue was discovered by Insyde engineering during a security review. This issue is fixed in Kernel 5.4: 05.44.23 and Kernel 5.5: 05.52.23. CWE-367 CWE-367 Report at: https://www.insyde.com/security-pledge/SA-2022056
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.001 (3.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Insyde Kernel
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Vendor Advisory)
- cve@mitre.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2022-33986?
- CVE-2022-33986 is a medium-severity vulnerability in Insyde Kernel, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.4/10. Published 2022-11-15.
- How severe is CVE-2022-33986?
- Medium severity. CVSS v3 base score is 6.4 out of 10.