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CVE-2022-48631

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0 When walking through an inode extents, the ext4_ext_bins…

Published Apr 28, 2024EPSS 0.24%

Overview

CVE-2022-48631 is a medium-severity vulnerability. It was published on April 28, 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:

ext4: fix bug in extents parsing when eh_entries == 0 and eh_depth > 0

When walking through an inode extents, the ext4_ext_binsearch_idx() function

assumes that the extent header has been previously validated. However, there

are no checks that verify that the number of entries (eh->eh_entries) is

non-zero when depth is > 0. And this will lead to problems because the

EXT_FIRST_INDEX() and EXT_LAST_INDEX() will return garbage and result in this:

[ 135.245946] ------------[ cut here ]------------

[ 135.247579] kernel BUG at fs/ext4/extents.c:2258!

[ 135.249045] invalid opcode: 0000 [#1] PREEMPT SMP

[ 135.250320] CPU: 2 PID: 238 Comm: tmp118 Not tainted 5.19.0-rc8+ #4

[ 135.252067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014

[ 135.255065] RIP: 0010:ext4_ext_map_blocks+0xc20/0xcb0

[ 135.256475] Code:

[ 135.261433] RSP: 0018:ffffc900005939f8 E

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/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0Refgit.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462dRefgit.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bcRefgit.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0Refgit.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefcRefgit.kernel.org/stable/c/29a5b8a137ac8eb410cc823653a29ac0e7b7e1b0Refgit.kernel.org/stable/c/2f5e9de15e4f55fbf56f22d4a2ce406246cc462dRefgit.kernel.org/stable/c/958b0ee23f5ac106e7cc11472b71aa2ea9a033bcRefgit.kernel.org/stable/c/bb7eb3ca4b3b0d2c7872cf1a41c30f5e5bd65df0Refgit.kernel.org/stable/c/be4df018c0be5ebecf1ca510feacc23be415cefc

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48631?

CVE-2022-48631 is a medium-severity vulnerability. It was published on April 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48631?

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-2022-48631?

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-2022-48631?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48631 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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