CVE-2022-21505

kernel: lockdown bypass using IMA

Published Dec 24, 2024 CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2022-26729 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).
Ubuntu USN Ubuntu USN USN-6031-1 Linux kernel (OEM) vulnerabilities
History
Type Values Removed Values Added
First Time appeared Oracle
Oracle linux
CPEs cpe:2.3:o:oracle:linux:7:-:*:*:*:*:*:*
cpe:2.3:o:oracle:linux:8:-:*:*:*:*:*:*
cpe:2.3:o:oracle:linux:9:-:*:*:*:*:*:*
Vendors & Products Oracle
Oracle linux
Type Values Removed Values Added
Weaknesses CWE-346
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An authentication bypass flaw was found in the Linux kernel’s IMA policy when a user performs lockdown. This flaw allows a local user to crash or potentially escalate their privileges on the system. 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).
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
oracle
Published
Updated
Oct 14, 2026, 3:02 PM
Reserved
Nov 15, 2021, 7:29 PM
Status
Modified
Published
Dec 24, 2024, 7:15 PM
Modified
Oct 14, 2026, 4:17 PM
Severity
Moderate
Public date
Jul 19, 2022, 12:00 AM