What is CVE-2026-64217?

CVE-2026-64217 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 6.3 onward and patched in 6.6.142, 6.12.92, 6.18.34 and others. CVE-2026-64217 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64217?

CVE-2026-64217 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-64217?

Yes, CVE-2026-64217 has been patched. Fixed versions include 6.6.142, 6.12.92, 6.18.34 and others. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64217 actively exploited?

CVE-2026-64217 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2026-64217

High

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix overrun check in netfs_extract_user_iter() Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills pages[], then those pages don't get included in the iterator constructed at the end of the function. If there was an overfill, memory corruption has already happened.

Package Linux Kernel

Published 2026-07-24

Last modified 2026-08-11

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-787

CVE-2026-64217 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

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

Affected versions

Linux kernel versions 6.3 and later are affected. Fixed in 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 6.3

Fixed in

✓ 6.6.142 6.6.x ✓ 6.12.92 6.12.x ✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

5 total

Kernel Git
https://git.kernel.org/stable/c/00efe58bbdcc93272d579ca24bfc912563f4a204

Patch
Kernel Git
https://git.kernel.org/stable/c/0ef37eef83fad3542ee06db2940433ae1a92b39d

Patch
Kernel Git
https://git.kernel.org/stable/c/96cc3beb2390ba9f9c128c5733c0ccfe450dd4f9

Patch
Kernel Git
https://git.kernel.org/stable/c/afeb32d9bf9aaeea51d0f723a19f14afb73bd94d

Patch
Kernel Git
https://git.kernel.org/stable/c/f48b9157f0f611fa436c360648603d5ded719b12

Patch

Details

CVE ID CVE-2026-64217

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-07-24

Modified 2026-08-11

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64217?

CVE-2026-64217 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 6.3 onward and has been patched in 6.6.142, 6.12.92, 6.18.34 and others. CVE-2026-64217 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64217?

CVE-2026-64217 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-64217?

Yes. CVE-2026-64217 has been patched. Fixed versions include 6.6.142, 6.12.92, 6.18.34 and others. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64217 actively exploited?

No. CVE-2026-64217 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.