What is CVE-2026-63865?

CVE-2026-63865 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10, affecting Linux kernel versions from 5.11 onward and patched in 5.15.209, 6.1.175, 6.6.141 and others. CVE-2026-63865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-63865?

CVE-2026-63865 has a CVSS score of 8.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Is there a patch available for CVE-2026-63865?

Yes, CVE-2026-63865 has been patched. Fixed versions include 5.15.209, 6.1.175, 6.6.141 and others. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-63865 actively exploited?

CVE-2026-63865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-63865

High

In the Linux kernel, the following vulnerability has been resolved: bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks bpf_lsm_task_to_inode() is called under rcu_read_lock() and bpf_lsm_inet_conn_established() is called from softirq context, so neither hook can be used by sleepable LSM programs.

Package Linux Kernel

Published 2026-07-19

Last modified 2026-07-27

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.11 and later are affected. Fixed in 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 5.11

Fixed in

✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.141 6.6.x ✓ 6.12.91 6.12.x ✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

7 total

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-63865

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2026-07-19

Modified 2026-07-27

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-63865?

CVE-2026-63865 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 . It affects Linux kernel versions from 5.11 onward and has been patched in 5.15.209, 6.1.175, 6.6.141 and others. CVE-2026-63865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-63865?

CVE-2026-63865 has a CVSS score of 8.8 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:C/C:H/I:H/A:H.
Is there a patch available for CVE-2026-63865?

Yes. CVE-2026-63865 has been patched. Fixed versions include 5.15.209, 6.1.175, 6.6.141 and others. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-63865 actively exploited?

No. CVE-2026-63865 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.