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CVE-2024-35973

5.5 · MEDIUM
Published May 20, 2024 linux CWE-908 EPSS 0.25% (16th pctl)

Overview

CVE-2024-35973 is a medium-severity vulnerability affecting linux linux_kernel. It was published on May 20, 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:

geneve: fix header validation in geneve[6]_xmit_skb

syzbot is able to trigger an uninit-value in geneve_xmit() [1]

Problem : While most ip tunnel helpers (like ip_tunnel_get_dsfield())

uses skb_protocol(skb, true), pskb_inet_may_pull() is only using

skb->protocol.

If anything else than ETH_P_IPV6 or ETH_P_IP is found in skb->protocol,

pskb_inet_may_pull() does nothing at all.

If a vlan tag was provided by the caller (af_packet in the syzbot case),

the network header might not point to the correct location, and skb

linear part could be smaller than expected.

Add skb_vlan_inet_prepare() to perform a complete mac validation.

Use this in geneve for the moment, I suspect we need to adopt this

more broadly.

v4 - Jakub reported v3 broke l2_tos_ttl_inherit.sh selftest

- Only call __vlan_get_protocol() for vlan types.

v2,v3 - Addressed Sabrina comments on v1 and v2

[1]

BUG: KMSAN: uninit-value in geneve_xmit_skb d

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 >= 4.19.191, < 4.19.313 Affected

References

Ref git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915 Ref git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e Ref git.kernel.org/stable/c/357163fff3a6e48fe74745425a32071ec9caf852 Ref git.kernel.org/stable/c/3c1ae6de74e3d2d6333d29a2d3e13e6094596c79 Ref git.kernel.org/stable/c/43be590456e1f3566054ce78ae2dbb68cbe1a536 Ref git.kernel.org/stable/c/4a1b65d1e55d53b397cb27014208be1e04172670 Ref git.kernel.org/stable/c/d3adf11d7993518a39bd02b383cfe657ccc0023c Ref git.kernel.org/stable/c/d8a6213d70accb403b82924a1c229e733433a5ef Ref git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915 Ref git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e

Frequently Asked Questions

What is CVE-2024-35973?

CVE-2024-35973 is a medium-severity vulnerability affecting linux linux_kernel. It was published on May 20, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-35973?

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-2024-35973?

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-2024-35973?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-35973 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

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