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CVE-2024-26857

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: geneve: make sure to pull inner header in geneve_rx() syzbot triggered a bug in geneve_rx() [1] Issue is similar to the one I…

Published Apr 17, 2024CWE-908EPSS 0.61%

Overview

CVE-2024-26857 is a high-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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:

geneve: make sure to pull inner header in geneve_rx()

syzbot triggered a bug in geneve_rx() [1]

Issue is similar to the one I fixed in commit 8d975c15c0cd

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

We have to save skb->network_header in a temporary variable

in order to be able to recompute the network_header pointer

after a pskb_inet_may_pull() call.

pskb_inet_may_pull() makes sure the needed headers are in skb->head.

[1]

BUG: KMSAN: uninit-value in IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]

BUG: KMSAN: uninit-value in geneve_rx drivers/net/geneve.c:279 [inline]

BUG: KMSAN: uninit-value in geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391

IP_ECN_decapsulate include/net/inet_ecn.h:302 [inline]

geneve_rx drivers/net/geneve.c:279 [inline]

geneve_udp_encap_recv+0x36f9/0x3c10 drivers/net/geneve.c:391

udp_queue_rcv_one_skb+0x1d39/0x1f20 net/ipv4/udp.c:2108

udp_q

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/048e16dee1fc609c1c85072ccd70bfd4b5fef6caRefgit.kernel.org/stable/c/0ece581d2a66e8e488c0d3b3e7b5760dbbfdbdd5Refgit.kernel.org/stable/c/1ca1ba465e55b9460e4e75dec9fff31e708fec74Refgit.kernel.org/stable/c/59d2a4076983303f324557a114cfd5c32e1f6b29Refgit.kernel.org/stable/c/c0b22568a9d8384fd000cc49acb8f74bde40d1b5Refgit.kernel.org/stable/c/c7137900691f5692fe3de54566ea7b30bb35d66cRefgit.kernel.org/stable/c/e431c3227864b5646601c97f5f898d99472f2914Refgit.kernel.org/stable/c/e77e0b0f2a11735c64b105edaee54d6344faca8aRefgit.kernel.org/stable/c/048e16dee1fc609c1c85072ccd70bfd4b5fef6caRefgit.kernel.org/stable/c/0ece581d2a66e8e488c0d3b3e7b5760dbbfdbdd5

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26857?

CVE-2024-26857 is a high-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-26857?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2024-26857?

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-2024-26857?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26857 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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