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CVE-2021-46915

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_limit: avoid possible divide error in nft_limit_init div_u64() divides u64 by u32.

Published Feb 27, 2024CWE-369EPSS 0.24%

Overview

CVE-2021-46915 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

netfilter: nft_limit: avoid possible divide error in nft_limit_init

div_u64() divides u64 by u32.

nft_limit_init() wants to divide u64 by u64, use the appropriate

math function (div64_u64)

divide error: 0000 [#1] PREEMPT SMP KASAN

CPU: 1 PID: 8390 Comm: syz-executor188 Not tainted 5.12.0-rc4-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RIP: 0010:div_u64_rem include/linux/math64.h:28 [inline]

RIP: 0010:div_u64 include/linux/math64.h:127 [inline]

RIP: 0010:nft_limit_init+0x2a2/0x5e0 net/netfilter/nft_limit.c:85

Code: ef 4c 01 eb 41 0f 92 c7 48 89 de e8 38 a5 22 fa 4d 85 ff 0f 85 97 02 00 00 e8 ea 9e 22 fa 4c 0f af f3 45 89 ed 31 d2 4c 89 f0 <49> f7 f5 49 89 c6 e8 d3 9e 22 fa 48 8d 7d 48 48 b8 00 00 00 00 00

RSP: 0018:ffffc90009447198 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000200000000000 RCX: 0000000000000000

RDX: 0000000000000000 RSI: ffffffff875152e6 R

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/01fb1626b620cb37a65ad08e0f626489e8f042efRefgit.kernel.org/stable/c/1bb3ee4259936cc3b2d80a4a480bbb4868575071Refgit.kernel.org/stable/c/9065ccb9ec92c5120e7e97958397ebdb454f23d6Refgit.kernel.org/stable/c/b895bdf5d643b6feb7c60856326dd4feb6981560Refgit.kernel.org/stable/c/dc1732baa9da5b68621586bf8636ebbc27dc62d2Refgit.kernel.org/stable/c/fadd3c4afdf3d4c21f4d138502f8b76334987e26Refgit.kernel.org/stable/c/01fb1626b620cb37a65ad08e0f626489e8f042efRefgit.kernel.org/stable/c/1bb3ee4259936cc3b2d80a4a480bbb4868575071Refgit.kernel.org/stable/c/9065ccb9ec92c5120e7e97958397ebdb454f23d6Refgit.kernel.org/stable/c/b895bdf5d643b6feb7c60856326dd4feb6981560

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46915?

CVE-2021-46915 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46915?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46915?

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-2021-46915?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46915 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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