CVE-2026-53268

netfilter: conntrack_irc: fix possible out-of-bounds read

HIGH
8.2
CVSS Score
Published: June 25, 2026 at 08:39 AM UTC
Updated: October 19, 2026 at 08:19 PM UTC
4 products affected across 2 vendorsLinux KernelSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSiplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity
HIGH8.2
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2.6.20 ≤ v < 5.10.2595.11 ≤ v < 5.15.2105.16 ≤ v < 6.1.1766.13 ≤ v < 6.18.366.19 ≤ v < 7.0.136.2 ≤ v < 6.6.1436.7 ≤ v < 6.12.947.17.1 rc17.1 rc27.1 rc37.1 rc47.1 rc57.1 rc6869f37d8e48f3911eb70f38a994feaa8f8380008
Vendor states this is fixed in 0afc802160af0df61ed374fdb97fb34cfe5cdf2f (fixed)
Vendor states this is fixed in 4cdda7f868f48e2f81579371584fdbdce37df2c8 (fixed)
Vendor states this is fixed in 573810f61bcd6b6815e2ff53bbdd2b9c9d747176 (fixed)
Vendor states this is fixed in 66eba0ffce3b7e11449946b4cbbef8ea36112f56 (fixed)
Vendor states this is fixed in 7c34f91305292083253df6a9f6c8ede02d4ccaea (fixed)
Vendor states this is fixed in 8a1d6e40dedfe1068aee094d851bd69e289c9fd6 (fixed)
Vendor states this is fixed in 9e5da2379f968a3ea5a6e38921ab6201576466dc (fixed)
Vendor states this is fixed in ddddd8271359961e403d11c90c9ba9fc38914f7e (fixed)
Vendor states this is fixed in 2.6.20 (unaffected)
Vendor states this is fixed in 5.10.259 (unaffected)
Vendor states this is fixed in 5.15.210 (unaffected)
Vendor states this is fixed in 6.1.176 (unaffected)
Vendor states this is fixed in 6.12.94 (unaffected)
Vendor states this is fixed in 6.18.36 (unaffected)
Vendor states this is fixed in 6.6.143 (unaffected)
Vendor states this is fixed in 7.0.13 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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