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CVE-2024-26641

8.6 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv() syzbot found __ip6_tnl_rcv() could access unitiliazed data [1].

Published Mar 18, 2024CWE-908EPSS 0.58%

Overview

CVE-2024-26641 is a high-severity vulnerability. It was published on March 18, 2024 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()

syzbot found __ip6_tnl_rcv() could access unitiliazed data [1].

Call pskb_inet_may_pull() to fix this, and initialize ipv6h

variable after this call as it can change skb->head.

[1]

BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]

BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]

BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321

__INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]

INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]

IP6_ECN_decapsulate+0x7df/0x1e50 include/net/inet_ecn.h:321

ip6ip6_dscp_ecn_decapsulate+0x178/0x1b0 net/ipv6/ip6_tunnel.c:727

__ip6_tnl_rcv+0xd4e/0x1590 net/ipv6/ip6_tunnel.c:845

ip6_tnl_rcv+0xce/0x100 net/ipv6/ip6_tunnel.c:888

gre_rcv+0x143f/0x1870

ip6_protocol_deliver_rcu+0xda6/0x2a60 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/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6Refgit.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0Refgit.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080Refgit.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0Refgit.kernel.org/stable/c/c835df3bcc14858ae9b27315dd7de76370b94f3aRefgit.kernel.org/stable/c/d54e4da98bbfa8c257bdca94c49652d81d18a4d8Refgit.kernel.org/stable/c/350a6640fac4b53564ec20aa3f4a0922cb0ba5e6Refgit.kernel.org/stable/c/8d975c15c0cd744000ca386247432d57b21f9df0Refgit.kernel.org/stable/c/a9bc32879a08f23cdb80a48c738017e39aea1080Refgit.kernel.org/stable/c/af6b5c50d47ab43e5272ad61935d0ed2e264d3f0

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26641?

CVE-2024-26641 is a high-severity vulnerability. It was published on March 18, 2024 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2024-26641?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-26641?

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-2024-26641?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26641 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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