What is CVE-2026-46323?

CVE-2026-46323 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 6.0 onward and patched in 6.1.176, 6.6.142, 6.12.92 and others. CVE-2026-46323 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46323?

CVE-2026-46323 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-2026-46323?

Yes, CVE-2026-46323 has been patched. Fixed versions include 6.1.176, 6.6.142, 6.12.92 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46323 actively exploited?

CVE-2026-46323 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-2026-46323

High

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

Package Linux Kernel

Published 2026-06-09

Last modified 2026-07-23

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-416

CVE-2026-46323 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 6.0 and later are affected. Fixed in 6.1.176, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 6.0

Fixed in

✓ 6.1.176 6.1.x ✓ 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

14 total

Kernel Git
https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06

Patch
Kernel Git
https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d

Patch
Kernel Git
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1

Patch
Kernel Git
https://git.kernel.org/stable/c/479084ae0e1d9cb7929cb4298d35623de189f80a

Patch
Kernel Git
https://git.kernel.org/stable/c/4db79a322db8c97f7b73b8a347395ef4d685eb40

Patch

Showing 5 of 14 references View all on NVD

Details

CVE ID CVE-2026-46323

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-06-09

Modified 2026-07-23

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46323?

CVE-2026-46323 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 6.0 onward and has been patched in 6.1.176, 6.6.142, 6.12.92 and others. CVE-2026-46323 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46323?

CVE-2026-46323 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-2026-46323?

Yes. CVE-2026-46323 has been patched. Fixed versions include 6.1.176, 6.6.142, 6.12.92 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46323 actively exploited?

No. CVE-2026-46323 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.