CVE-2022-21505: linux — Fix

Description

In the linux kernel, if IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine when Secure Boot is disabled or unavailable. IMA prevents setting "ima_appraise=log" from the boot param when Secure Boot is enabled, but this does not cover cases where lockdown is used without Secure Boot. CVSS 3.1 Base Score 6.7 (Confidentiality, Integrity, Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

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CVSS v3.1 Score

6.7

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-346 CWE-346

Affected Products

Vendor	Product	Versions
oracle	linux	All
oracle	linux	All
oracle	linux	All

References

Advisories & Patches

https://linux.oracle.com/cve/CVE-2022-21505.html

Other References

https://git.kernel.org/linus/543ce63b664e2c2f9533d089a4664b559c3e6b5b

Frequently Asked Questions

What is CVE-2022-21505? +

In the linux kernel, if IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine when Secure Boot is disabled or unavailable. IMA prevents setting "ima_appraise=log" from the boot param when Secure Boot is enabled, but this does not cover cases where lockdown is used without Secure Boot. CVSS 3.1 Base Score 6.7 (Confidentiality, Integrity, Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H). It has a CVSS v3.1 base score of 6.7 (MEDIUM).

How severe is CVE-2022-21505? +

CVE-2022-21505 has a CVSS v3.1 score of 6.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-21505? +

CVE-2022-21505 affects products from oracle, specifically: linux. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-21505? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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