medium
5.5
CWE
252
Advisory Published
CVE Published
Updated

CVE-2021-43056

First published: Mon Oct 25 2021(Updated: )

A denial of service problem was found in KVM specific to powerpc. In this flaw, a user with local access can confuse the host offline code, causing the guest to crash. References: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337</a>

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:4.18.0-372.9.1.el8
0:4.18.0-372.9.1.el8
redhat/kernel<5.15
5.15
Linux kernel>=5.2<5.4.15
Fedora=33
Fedora=34
Fedora=35
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.17-1

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

http://www.openwall.com/lists/oss-security/2021/10/28/1

Remedy

https://git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337

Remedy

https://lore.kernel.org/linuxppc-dev/87pmrtbbdt.fsf@mpe.ellerman.id.au/T/#u

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-43056?

    CVE-2021-43056 has been classified as a denial of service vulnerability which may have a critical impact in certain environments.

  • How do I fix CVE-2021-43056?

    To mitigate CVE-2021-43056, update to the recommended kernel versions provided by your Linux distribution.

  • Who is affected by CVE-2021-43056?

    CVE-2021-43056 affects users of KVM on powerpc architecture, particularly those with local access.

  • What impact does CVE-2021-43056 have on systems?

    CVE-2021-43056 can cause guest virtual machines to crash, impacting availability.

  • What versions of kernel are vulnerable to CVE-2021-43056?

    Kernel versions prior to 0:4.18.0-372.9.1.el8 and various versions of Linux kernel up to 5.4.15 are vulnerable to CVE-2021-43056.

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