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CVE-2023-53600

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: tunnels: fix kasan splat when generating ipv4 pmtu error If we try to emit an icmp error in response to a nonliner skb, we get…

Published Oct 4, 2025CWE-125EPSS 0.29%

Overview

CVE-2023-53600 is a critical-severity vulnerability. It was published on October 4, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. 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:

tunnels: fix kasan splat when generating ipv4 pmtu error

If we try to emit an icmp error in response to a nonliner skb, we get

BUG: KASAN: slab-out-of-bounds in ip_compute_csum+0x134/0x220

Read of size 4 at addr ffff88811c50db00 by task iperf3/1691

CPU: 2 PID: 1691 Comm: iperf3 Not tainted 6.5.0-rc3+ #309

[..]

kasan_report+0x105/0x140

ip_compute_csum+0x134/0x220

iptunnel_pmtud_build_icmp+0x554/0x1020

skb_tunnel_check_pmtu+0x513/0xb80

vxlan_xmit_one+0x139e/0x2ef0

vxlan_xmit+0x1867/0x2760

dev_hard_start_xmit+0x1ee/0x4f0

br_dev_queue_push_xmit+0x4d1/0x660

[..]

ip_compute_csum() cannot deal with nonlinear skbs, so avoid it.

After this change, splat is gone and iperf3 is no longer stuck.

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/5850c391fd7e25662334cb3cbf29a62bcbff1084Refgit.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940Refgit.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5ccRefgit.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222cRefgit.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174d

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53600?

CVE-2023-53600 is a critical-severity vulnerability. It was published on October 4, 2025 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2023-53600?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-53600?

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-2023-53600?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53600 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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