high
7.5
Advisory Published
CVE Published
Updated

CVE-2022-36946

First published: Tue Jul 26 2022(Updated: )

A Linux Kernel flaw found in the net/netfilter/nfnetlink_queue.c. If local user creates netfilter rule that truncates the packet below the header size, the skb_pull() will result in a malformed skb (skb-&gt;len &lt; 0). As result, denial of service could happen after incorrect check in nfqnl_mangle function. Fixes: 7af4cc3fa158 ("[NETFILTER]: Add "nfnetlink_queue" netfilter queue handler over nfnetlink") Reference: <a href="https://lore.kernel.org/all/20220726104206.2036-1-fw@strlen.de/t/">https://lore.kernel.org/all/20220726104206.2036-1-fw@strlen.de/t/</a>

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

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<5.18.16
5.18.16
Linux Kernel>=2.6.14<4.9.326
Linux Kernel>=4.10<4.14.291
Linux Kernel>=4.15<4.19.255
Linux Kernel>=4.20<5.4.209
Linux Kernel>=5.5<5.10.135
Linux Kernel>=5.11<5.15.59
Linux Kernel>=5.16<5.18.16
Debian GNU/Linux=10.0
Debian GNU/Linux=11.0
NetApp Active IQ Unified Manager for VMware vSphere
netapp solidfire \& hci management node
netapp solidfire \& hci storage node
NetApp SolidFire Enterprise SDS
netapp hci compute node
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1

Remedy

To mitigate this issue, prevent the module nfnetlink_queue from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blocklist a kernel module to prevent it from loading automatically.

Remedy

https://marc.info/?l=netfilter-devel&m=165883202007292&w=2

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2022-36946?

    CVE-2022-36946 has a high severity rating due to its potential to cause denial of service in the Linux Kernel.

  • How do I fix CVE-2022-36946?

    To fix CVE-2022-36946, update to one of the patched versions listed, such as kernel-rt 0:4.18.0-425.3.1.rt7.213.el8 or kernel 0:5.14.0-162.6.1.el9_1.

  • Who is affected by CVE-2022-36946?

    CVE-2022-36946 affects users of Linux Kernel versions prior to the patched versions listed in the advisory.

  • What is the impact of CVE-2022-36946?

    The impact of CVE-2022-36946 can lead to system instability and denial of service due to improper packet handling.

  • Is CVE-2022-36946 a local or remote vulnerability?

    CVE-2022-36946 is a local vulnerability that can be exploited by a local user to create a denial of service condition.

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