What is CVE-2026-53268?

CVE-2026-53268 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 2.6.20 onward and patched in 5.10.259, 5.15.210, 6.1.176 and others. CVE-2026-53268 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53268?

CVE-2026-53268 has a CVSS score of 8.2 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

Is there a patch available for CVE-2026-53268?

Yes, CVE-2026-53268 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.176 and others. If you are running Linux kernel 2.6.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53268 actively exploited?

CVE-2026-53268 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2026-53268

High

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.

Package Linux Kernel

Published 2026-06-25

Last modified 2026-07-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.2

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Weakness type

CWE-125

CVE-2026-53268 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.20 and later are affected. Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13, 7.1 and their respective stable series.

Affected from

≥ 2.6.20

Fixed in

✓ 5.10.259 5.10.x ✓ 5.15.210 5.15.x ✓ 6.1.176 6.1.x ✓ 6.6.143 6.6.x ✓ 6.12.94 6.12.x ✓ 6.18.36 6.18.x ✓ 7.0.13 7.0.x ✓ 7.1

References

8 total

Kernel Git
https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f

Patch
Kernel Git
https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8

Patch
Kernel Git
https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176

Patch
Kernel Git
https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56

Patch
Kernel Git
https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-53268

Severity High

CVSS score 8.2 / 10

CVSS version 3.1

Published 2026-06-25

Modified 2026-07-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53268?

CVE-2026-53268 is a High severity Linux kernel vulnerability with a CVSS score of 8.2 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 2.6.20 onward and has been patched in 5.10.259, 5.15.210, 6.1.176 and others. CVE-2026-53268 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53268?

CVE-2026-53268 has a CVSS score of 8.2 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
Is there a patch available for CVE-2026-53268?

Yes. CVE-2026-53268 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.1.176 and others. If you are running Linux kernel 2.6.20 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53268 actively exploited?

No. CVE-2026-53268 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.