medium
6.7
CWE
787 267
Advisory Published
CVE Published
CVE Published
Updated

CVE-2022-21499

First published: Wed May 11 2022(Updated: )

A flaw was found in kernel/debug/debug_core.c in the Linux kernel in the lockdown mode. In this flaw, an attacker with local access could trigger the debugger, bypass lockdown and write anonymously. In this flaw, KGDB and KDB allow read and write access to kernel memory, and thus should not be allowed during lockdown. An attacker with access to a serial port could trigger the debugger and use it to bypass lockdown. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eadb2f47a3ced5c64b23b90fd2a3463f63726066">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eadb2f47a3ced5c64b23b90fd2a3463f63726066</a>

Credit: secalert_us@oracle.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-425.3.1.rt7.213.el8
0:4.18.0-425.3.1.rt7.213.el8
redhat/kernel<0:4.18.0-425.3.1.el8
0:4.18.0-425.3.1.el8
redhat/kernel<0:5.14.0-162.6.1.el9_1
0:5.14.0-162.6.1.el9_1
redhat/kernel-rt<0:5.14.0-162.6.1.rt21.168.el9_1
0:5.14.0-162.6.1.rt21.168.el9_1
redhat/kernel<5.19
5.19
Oracle Linux=6
Oracle Linux=7
Oracle Linux=8
Debian Linux=11.0
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.135-1
6.12.25-1
6.12.27-1

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Remedy

https://git.kernel.org/linus/eadb2f47a3ced5c64b23b90fd2a3463f63726066

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2022-21499?

    CVE-2022-21499 is considered a high severity vulnerability due to its potential to allow local attackers to bypass lockdown mode and write to kernel memory.

  • How do I fix CVE-2022-21499?

    To fix CVE-2022-21499, update to the latest kernel versions provided, such as kernel-rt version 0:4.18.0-425.3.1.rt7.213.el8 or kernel version 0:5.14.0-162.6.1.el9_1.

  • What systems are affected by CVE-2022-21499?

    CVE-2022-21499 affects various Linux distributions, including Red Hat, Oracle Linux, and Debian, particularly versions under the kernel package.

  • Can CVE-2022-21499 be exploited remotely?

    No, CVE-2022-21499 requires local access to the system to exploit, meaning an attacker must have physical or SSH access to the affected machine.

  • What is the impact of CVE-2022-21499 on system security?

    The impact of CVE-2022-21499 on system security is significant as it allows an attacker to bypass kernel lockdown protections, potentially leading to unauthorized access and manipulation of kernel memory.

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