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CVE-2024-26633

5.5 · MEDIUM

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…

Published Mar 18, 2024EPSS 0.33%

Overview

CVE-2024-26633 is a medium-severity vulnerability. 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, 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/135414f300c5db995e2a2f3bf0f455de9d014aeeRefgit.kernel.org/stable/c/3f15ba3dc14e6ee002ea01b4faddc3d49200377cRefgit.kernel.org/stable/c/4329426cf6b8e22b798db2331c7ef1dd2a9c748dRefgit.kernel.org/stable/c/62a1fedeb14c7ac0947ef33fadbabd35ed2400a2Refgit.kernel.org/stable/c/687c5d52fe53e602e76826dbd4d7af412747e183Refgit.kernel.org/stable/c/ba8d904c274268b18ef3dc11d3ca7b24a96cb087Refgit.kernel.org/stable/c/d375b98e0248980681e5e56b712026174d617198Refgit.kernel.org/stable/c/da23bd709b46168f7dfc36055801011222b076cdRefgit.kernel.org/stable/c/135414f300c5db995e2a2f3bf0f455de9d014aeeRefgit.kernel.org/stable/c/3f15ba3dc14e6ee002ea01b4faddc3d49200377c

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26633?

CVE-2024-26633 is a medium-severity vulnerability. 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, 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-2024-26633?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26633 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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