What’s Vulnerable › Vulnerabilities

CVE-2026-53268: netfilter: conntrack_irc: fix possible out-of-bounds read

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-10-19
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack_irc: fix possible out-of-bounds read When parsing fails after we've matched the command string we should bail out instead of trying to match a different command. This helper should be deprecated, given prevalence of TLS I doubt it has any relevance in 2026.

Affected products

• Linux kernel: from 2.6.20 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.12.94, 6.18.36, 6.6.143

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.12.94. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f
• https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8
• https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176
• https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56
• https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea
• https://git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6
• https://git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc
• https://git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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