What is CVE-2026-63797?

CVE-2026-63797 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 5.18 onward and patched in 6.1.178, 6.6.144, 6.12.95 and others. CVE-2026-63797 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-63797?

CVE-2026-63797 has a CVSS score of 8.4 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-63797?

Yes, CVE-2026-63797 has been patched. Fixed versions include 6.1.178, 6.6.144, 6.12.95 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-63797 actively exploited?

CVE-2026-63797 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2026-63797

High

In the Linux kernel, the following vulnerability has been resolved: rpmsg: char: Fix use-after-free on probe error path rpmsg_chrdev_probe() stores the newly allocated eptdev in the default endpoint's priv pointer before calling rpmsg_chrdev_eptdev_add(). If rpmsg_chrdev_eptdev_add() then fails, its error path frees eptdev while the default endpoint may still dispatch callbacks with the stale priv pointer. Avoid publishing eptdev through the default endpoint until rpmsg_chrdev_eptdev_add() succeeds. Messages received before the priv pointer is published should be ignored by rpmsg_ept_cb(). Flow-control updates can hit rpmsg_ept_flow_cb() in the same window, so make both callbacks return success when priv is NULL.

Package Linux Kernel

Published 2026-07-19

Last modified 2026-08-17

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.4

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2026-63797 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.18 and later are affected. Fixed in 6.1.178, 6.6.144, 6.12.95, 6.18.38, 7.1.3, 7.2 and their respective stable series.

Affected from

≥ 5.18

Fixed in

✓ 6.1.178 6.1.x ✓ 6.6.144 6.6.x ✓ 6.12.95 6.12.x ✓ 6.18.38 6.18.x ✓ 7.1.3 7.1.x ✓ 7.2

References

6 total

Kernel Git
https://git.kernel.org/stable/c/104d100212396801f1d9d388282f746e23e2bfd6

Patch
Kernel Git
https://git.kernel.org/stable/c/1306fc4f76f765727a6d5aefbf08ef0c8f32996f

Patch
Kernel Git
https://git.kernel.org/stable/c/1ff3f528e67d20e2b1483dcaba899dc7832b2e6b

Patch
Kernel Git
https://git.kernel.org/stable/c/c5ebb06c7e24d531b68707168e04698859d642bc

Patch
Kernel Git
https://git.kernel.org/stable/c/ddf13f91ca82c94ef7ad9c41a434a03313f8eb1b

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-63797

Severity High

CVSS score 8.4 / 10

CVSS version 3.1

Published 2026-07-19

Modified 2026-08-17

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-63797?

CVE-2026-63797 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.178, 6.6.144, 6.12.95 and others. CVE-2026-63797 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-63797?

CVE-2026-63797 has a CVSS score of 8.4 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-63797?

Yes. CVE-2026-63797 has been patched. Fixed versions include 6.1.178, 6.6.144, 6.12.95 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-63797 actively exploited?

No. CVE-2026-63797 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.