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CVE-2021-47014

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: fix wild memory access when clearing fragments while testing re-assembly/re-fragmentation using act_ct, it's…

Published Feb 28, 2024CWE-754EPSS 0.24%

Overview

CVE-2021-47014 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

net/sched: act_ct: fix wild memory access when clearing fragments

while testing re-assembly/re-fragmentation using act_ct, it's possible to

observe a crash like the following one:

KASAN: maybe wild-memory-access in range [0x0001000000000448-0x000100000000044f]

CPU: 50 PID: 0 Comm: swapper/50 Tainted: G S 5.12.0-rc7+ #424

Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.4.3 01/17/2017

RIP: 0010:inet_frag_rbtree_purge+0x50/0xc0

Code: 00 fc ff df 48 89 c3 31 ed 48 89 df e8 a9 7a 38 ff 4c 89 fe 48 89 df 49 89 c6 e8 5b 3a 38 ff 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 75 59 48 8d bb d0 00 00 00 4c 8b 6b 40 48 89 f8 48

RSP: 0018:ffff888c31449db8 EFLAGS: 00010203

RAX: 0000200000000089 RBX: 000100000000040e RCX: ffffffff989eb960

RDX: 0000000000000140 RSI: ffffffff97cfb977 RDI: 000100000000044e

RBP: 0000000000000900 R08: 0000000000000000 R09: ffffed1186289350

R10: 0000000000000003 R11:

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/0648941f4c8bbf8b4b6c0b270889ae7aa769b921Refgit.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806Refgit.kernel.org/stable/c/0648941f4c8bbf8b4b6c0b270889ae7aa769b921Refgit.kernel.org/stable/c/f77bd544a6bbe69aa50d9ed09f13494cf36ff806

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47014?

CVE-2021-47014 is a high-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47014?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47014?

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-2021-47014?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47014 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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