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CVE-2021-46992

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: avoid overflows in nft_hash_buckets() Number of buckets being stored in 32bit variables, we have to ensure…

Published Feb 28, 2024CWE-125EPSS 0.26%

Overview

CVE-2021-46992 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:

netfilter: nftables: avoid overflows in nft_hash_buckets()

Number of buckets being stored in 32bit variables, we have to

ensure that no overflows occur in nft_hash_buckets()

syzbot injected a size == 0x40000000 and reported:

UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13

shift exponent 64 is too large for 64-bit type 'long unsigned int'

CPU: 1 PID: 29539 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0

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

Call Trace:

__dump_stack lib/dump_stack.c:79 [inline]

dump_stack+0x141/0x1d7 lib/dump_stack.c:120

ubsan_epilogue+0xb/0x5a lib/ubsan.c:148

__ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327

__roundup_pow_of_two include/linux/log2.h:57 [inline]

nft_hash_buckets net/netfilter/nft_set_hash.c:411 [inline]

nft_hash_estimate.cold+0x19/0x1e net/netfilter/nft_set_hash.c:652

nft_select_set_ops n

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/1e8ab479cfbe5751efccedb95afb9b112a5ba475Refgit.kernel.org/stable/c/2824cafc6a93792d9ad85939c499161214d84c4bRefgit.kernel.org/stable/c/72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7Refgit.kernel.org/stable/c/a388d10961ff8578b1a6691945d406c0f33aa71bRefgit.kernel.org/stable/c/a54754ec9891830ba548e2010c889e3c8146e449Refgit.kernel.org/stable/c/c77e2ef18167ad334e27610ced9a7f6af5ec1787Refgit.kernel.org/stable/c/efcd730ddd6f25578bd31bfe703e593e2421d708Refgit.kernel.org/stable/c/1e8ab479cfbe5751efccedb95afb9b112a5ba475Refgit.kernel.org/stable/c/2824cafc6a93792d9ad85939c499161214d84c4bRefgit.kernel.org/stable/c/72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46992?

CVE-2021-46992 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-2021-46992?

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-2021-46992?

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-2021-46992?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46992 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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