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CVE-2024-26636

5.5 · MEDIUM
Published Mar 18, 2024 linux EPSS 0.24% (15th pctl)

Overview

CVE-2024-26636 is a medium-severity vulnerability affecting linux linux_kernel. It was published on March 18, 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:

llc: make llc_ui_sendmsg() more robust against bonding changes

syzbot was able to trick llc_ui_sendmsg(), allocating an skb with no

headroom, but subsequently trying to push 14 bytes of Ethernet header [1]

Like some others, llc_ui_sendmsg() releases the socket lock before

calling sock_alloc_send_skb().

Then it acquires it again, but does not redo all the sanity checks

that were performed.

This fix:

- Uses LL_RESERVED_SPACE() to reserve space.

- Check all conditions again after socket lock is held again.

- Do not account Ethernet header for mtu limitation.

[1]

skbuff: skb_under_panic: text:ffff800088baa334 len:1514 put:14 head:ffff0000c9c37000 data:ffff0000c9c36ff2 tail:0x5dc end:0x6c0 dev:bond0

kernel BUG at net/core/skbuff.c:193 !

Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP

Modules linked in:

CPU: 0 PID: 6875 Comm: syz-executor.0 Not tainted 6.7.0-rc8-syzkaller-00101-g0802e17d9aca-dirty #0

H

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

Vendor Product Versions Status
linux linux_kernel >= 2.6.12, < 4.19.307 Affected

References

Ref git.kernel.org/stable/c/04f2a74b562f3a7498be0399309669f342793d8c Ref git.kernel.org/stable/c/6d53b813ff8b177f86f149c2f744442681f720e4 Ref git.kernel.org/stable/c/84e9d10419f6f4f3f3cd8f9aaf44a48719aa4b1b Ref git.kernel.org/stable/c/b643d0defcbacd7fe548bc65c3e4e6f17dc5eb2d Ref git.kernel.org/stable/c/c22044270da68881074fda81a7d34812726cb249 Ref git.kernel.org/stable/c/c451c008f563d56d5e676c9dcafae565fcad84bb Ref git.kernel.org/stable/c/cafd3ad3fe03ef4d6632747be9ee15dc0029db4b Ref git.kernel.org/stable/c/dad555c816a50c6a6a8a86be1f9177673918c647 Ref git.kernel.org/stable/c/04f2a74b562f3a7498be0399309669f342793d8c Ref git.kernel.org/stable/c/6d53b813ff8b177f86f149c2f744442681f720e4

Frequently Asked Questions

What is CVE-2024-26636?

CVE-2024-26636 is a medium-severity vulnerability affecting linux linux_kernel. It was published on March 18, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26636?

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-2024-26636?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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-2024-26636?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-26636 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.

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