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CVE-2021-46955

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix stack OOB read while fragmenting IPv4 packets running openvswitch on kernels built with KASAN, it's possible t…

Published Feb 27, 2024CWE-125EPSS 0.75%

Overview

CVE-2021-46955 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

openvswitch: fix stack OOB read while fragmenting IPv4 packets

running openvswitch on kernels built with KASAN, it's possible to see the

following splat while testing fragmentation of IPv4 packets:

BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60

Read of size 1 at addr ffff888112fc713c by task handler2/1367

CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418

Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014

Call Trace:

dump_stack+0x92/0xc1

print_address_description.constprop.7+0x1a/0x150

kasan_report.cold.13+0x7f/0x111

ip_do_fragment+0x1b03/0x1f60

ovs_fragment+0x5bf/0x840 [openvswitch]

do_execute_actions+0x1bd5/0x2400 [openvswitch]

ovs_execute_actions+0xc8/0x3d0 [openvswitch]

ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]

genl_family_rcv_msg_doit.isra.15+0x227/0x2d0

genl_rcv_msg+0x287/0x490

netlink_rcv_skb+0x120/0x380

genl_rcv+0

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/23e17ec1a5eb53fe39cc34fa5592686d5acd0dacRefgit.kernel.org/stable/c/490ad0a2390442d0a7b8c00972a83dbb09cab142Refgit.kernel.org/stable/c/5a52fa8ad45b5a593ed416adf326538638454ff1Refgit.kernel.org/stable/c/7c0ea5930c1c211931819d83cfb157bff1539a4cRefgit.kernel.org/stable/c/a1478374b0bda89b4277a8afd39208271faad4beRefgit.kernel.org/stable/c/b1d7280f9ba1bfdbc3af5bdb82e51f014854f26fRefgit.kernel.org/stable/c/b3502b04e84ac5349be95fc033c17bd701d2787aRefgit.kernel.org/stable/c/d841d3cf5297fde4ce6a41ff35451d0e82917f3eRefgit.kernel.org/stable/c/df9e900de24637be41879e2c50afb713ec4e8b2eRefgit.kernel.org/stable/c/23e17ec1a5eb53fe39cc34fa5592686d5acd0dac

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46955?

CVE-2021-46955 is a high-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-46955?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-46955?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46955?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46955 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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