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CVE-2024-26635

5.5 · MEDIUM
Published Mar 18, 2024 linux CWE-909 EPSS 0.24% (15th pctl)

Overview

CVE-2024-26635 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: Drop support for ETH_P_TR_802_2.

syzbot reported an uninit-value bug below. [0]

llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2

(0x0011), and syzbot abused the latter to trigger the bug.

write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16)

llc_conn_handler() initialises local variables {saddr,daddr}.mac

based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes

them to __llc_lookup().

However, the initialisation is done only when skb->protocol is

htons(ETH_P_802_2), otherwise, __llc_lookup_established() and

__llc_lookup_listener() will read garbage.

The missing initialisation existed prior to commit 211ed865108e

("net: delete all instances of special processing for token ring").

It removed the part to kick out the token ring stuff but forgot to

close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv(

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 >= 3.5, < 4.19.307 Affected

References

Ref git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62 Ref git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6 Ref git.kernel.org/stable/c/9ccdef19cf9497c2803b005369668feb91cacdfd Ref git.kernel.org/stable/c/b8e8838f82f332ae80c643dbb1ca4418d0628097 Ref git.kernel.org/stable/c/c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828 Ref git.kernel.org/stable/c/df57fc2f2abf548aa889a36ab0bdcc94a75399dc Ref git.kernel.org/stable/c/e3f9bed9bee261e3347131764e42aeedf1ffea61 Ref git.kernel.org/stable/c/f1f34a515fb1e25e85dee94f781e7869ae351fb8 Ref git.kernel.org/stable/c/165ad1e22779685c3ed3dd349c6c4c632309cc62 Ref git.kernel.org/stable/c/660c3053d992b68fee893a0e9ec9159228cffdc6

Frequently Asked Questions

What is CVE-2024-26635?

CVE-2024-26635 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-2024-26635?

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-2024-26635?

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-2024-26635?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-26635 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

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