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CVE-2024-26633

5.5 · MEDIUM
Published Mar 18, 2024 linux EPSS 0.33% (26th pctl)

Overview

CVE-2024-26633 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:

ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()

syzbot pointed out [1] that NEXTHDR_FRAGMENT handling is broken.

Reading frag_off can only be done if we pulled enough bytes

to skb->head. Currently we might access garbage.

[1]

BUG: KMSAN: uninit-value in ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0

ip6_tnl_parse_tlv_enc_lim+0x94f/0xbb0

ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1326 [inline]

ip6_tnl_start_xmit+0xab2/0x1a70 net/ipv6/ip6_tunnel.c:1432

__netdev_start_xmit include/linux/netdevice.h:4940 [inline]

netdev_start_xmit include/linux/netdevice.h:4954 [inline]

xmit_one net/core/dev.c:3548 [inline]

dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3564

__dev_queue_xmit+0x33b8/0x5130 net/core/dev.c:4349

dev_queue_xmit include/linux/netdevice.h:3134 [inline]

neigh_connected_output+0x569/0x660 net/core/neighbour.c:1592

neigh_output include/net/neighbour.h:542 [inline]

ip6_finish_output2+0x23a9/0x2b30 net/

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 >= 4.10, < 4.19.306 Affected

References

Ref git.kernel.org/stable/c/135414f300c5db995e2a2f3bf0f455de9d014aee Ref git.kernel.org/stable/c/3f15ba3dc14e6ee002ea01b4faddc3d49200377c Ref git.kernel.org/stable/c/4329426cf6b8e22b798db2331c7ef1dd2a9c748d Ref git.kernel.org/stable/c/62a1fedeb14c7ac0947ef33fadbabd35ed2400a2 Ref git.kernel.org/stable/c/687c5d52fe53e602e76826dbd4d7af412747e183 Ref git.kernel.org/stable/c/ba8d904c274268b18ef3dc11d3ca7b24a96cb087 Ref git.kernel.org/stable/c/d375b98e0248980681e5e56b712026174d617198 Ref git.kernel.org/stable/c/da23bd709b46168f7dfc36055801011222b076cd Ref git.kernel.org/stable/c/135414f300c5db995e2a2f3bf0f455de9d014aee Ref git.kernel.org/stable/c/3f15ba3dc14e6ee002ea01b4faddc3d49200377c

Frequently Asked Questions

What is CVE-2024-26633?

CVE-2024-26633 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-2024-26633?

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-2024-26633?

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-2024-26633?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-26633 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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Code Review

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HackBrowser

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

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