What is CVE-2026-64253?

CVE-2026-64253 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 6.9 onward and patched in 6.12.95, 6.18.38, 7.1.3 and others. CVE-2026-64253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64253?

CVE-2026-64253 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-64253?

Yes, CVE-2026-64253 has been patched. Fixed versions include 6.12.95, 6.18.38, 7.1.3 and others. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64253 actively exploited?

CVE-2026-64253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2026-64253

Medium

In the Linux kernel, the following vulnerability has been resolved: kernel/fork: clear PF_BLOCK_TS in copy_process() PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is non-NULL, and blk_finish_plug() clears it via __blk_flush_plug() before NULLing the plug pointer. copy_process() breaks the invariant by inheriting PF_BLOCK_TS from the parent while resetting the child's plug to NULL. Clear PF_BLOCK_TS alongside that assignment so callers can rely on "PF_BLOCK_TS set implies current->plug != NULL" and dereference current->plug unguarded.

Package Linux Kernel

Published 2026-07-24

Last modified 2026-08-17

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2026-64253 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.9 and later are affected. Fixed in 6.12.95, 6.18.38, 7.1.3, 7.2 and their respective stable series.

Affected from

≥ 6.9

Fixed in

✓ 6.12.95 6.12.x ✓ 6.18.38 6.18.x ✓ 7.1.3 7.1.x ✓ 7.2

References

4 total

Kernel Git
https://git.kernel.org/stable/c/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619

Patch
Kernel Git
https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd

Patch
Kernel Git
https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f

Patch
Kernel Git
https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81

Patch

Details

CVE ID CVE-2026-64253

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-07-24

Modified 2026-08-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64253?

CVE-2026-64253 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 6.9 onward and has been patched in 6.12.95, 6.18.38, 7.1.3 and others. CVE-2026-64253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64253?

CVE-2026-64253 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-64253?

Yes. CVE-2026-64253 has been patched. Fixed versions include 6.12.95, 6.18.38, 7.1.3 and others. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64253 actively exploited?

No. CVE-2026-64253 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.