What is CVE-2026-64370?

CVE-2026-64370 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.12 onward and patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64370 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64370?

CVE-2026-64370 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-2026-64370?

Yes, CVE-2026-64370 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64370 actively exploited?

CVE-2026-64370 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64370

Medium

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: Fix pid refcount leak in do_cpu_nanosleep() error path In do_cpu_nanosleep(), posix_cpu_timer_create() takes a pid reference via get_pid() and stores it in timer.it.cpu.pid. If the subsequent posix_cpu_timer_set() call fails, the function returns immediately without calling posix_cpu_timer_del() to release the pid reference, causing a leak. Fix it by calling posix_cpu_timer_del() before the unlock-and-return on the error path, consistent with the other exit paths in the same function.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-09-08

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

Affected versions

Linux kernel versions 2.6.12 and later are affected. Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 and their respective stable series.

Affected from

≥ 2.6.12

Fixed in

✓ 5.10.261 5.10.x ✓ 5.15.212 5.15.x ✓ 6.1.178 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2

References

9 total

Kernel Git
https://git.kernel.org/stable/c/7776f9226e99eb49d97492b0b445027cfcb189da

Patch
Kernel Git
https://git.kernel.org/stable/c/87bd2ad568e15b90d5f7d4bcd70342d05dad649c

Patch
Kernel Git
https://git.kernel.org/stable/c/8a270b1258797f61b61da44f8bfd41a581b5c85b

Patch
Kernel Git
https://git.kernel.org/stable/c/8f06363446c5d043c9a7c008b250040e9de98cf9

Patch
Kernel Git
https://git.kernel.org/stable/c/afed3cdc1cca133f804fcf57ff228974f424b23a

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2026-64370

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-07-25

Modified 2026-09-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64370?

CVE-2026-64370 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.12 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64370 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64370?

CVE-2026-64370 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-2026-64370?

Yes. CVE-2026-64370 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64370 actively exploited?

No. CVE-2026-64370 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.