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CVE-2024-38538

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: bridge: xmit: make sure we have at least eth header len bytes syzbot triggered an uninit value[1] error in bridge device's…

Published Jun 19, 2024CWE-908EPSS 0.28%

Overview

CVE-2024-38538 is a high-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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: bridge: xmit: make sure we have at least eth header len bytes

syzbot triggered an uninit value[1] error in bridge device's xmit path

by sending a short (less than ETH_HLEN bytes) skb. To fix it check if

we can actually pull that amount instead of assuming.

Tested with dropwatch:

drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)

origin: software

timestamp: Mon May 13 11:31:53 2024 778214037 nsec

protocol: 0x88a8

length: 2

original length: 2

drop reason: PKT_TOO_SMALL

[1]

BUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65

br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65

__netdev_start_xmit include/linux/netdevice.h:4903 [inline]

netdev_start_xmit include/linux/netdevice.h:4917 [inline]

xmit_one net/core/dev.c:3531 [inline]

dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547

__dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341

dev_queue_xmit include/linux/ne

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/1abb371147905ba250b4cc0230c4be7e90bea4d5Refgit.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2Refgit.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741caRefgit.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547aRefgit.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17Refgit.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afcRefgit.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11Refgit.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821dRefgit.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2Refgit.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5

How CyberStrike helps

Frequently asked questions

What is CVE-2024-38538?

CVE-2024-38538 is a high-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-38538?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2024-38538?

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-2024-38538?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-38538 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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