What is CVE-2026-46090?

CVE-2026-46090 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 2.6.37 onward and patched in 5.10.259, 5.15.210, 6.12.88 and others. CVE-2026-46090 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46090?

CVE-2026-46090 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-2026-46090?

Yes, CVE-2026-46090 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.12.88 and others. If you are running Linux kernel 2.6.37 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46090 actively exploited?

CVE-2026-46090 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-2026-46090

High

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix peer runtime UAF during format-change stop loopback_check_format() may stop the capture side when playback starts with parameters that no longer match a running capture stream. Commit 826af7fa62e3 ("ALSA: aloop: Fix racy access at PCM trigger") moved the peer lookup under cable->lock, but the actual snd_pcm_stop() still runs after dropping that lock. A concurrent close can clear the capture entry from cable->streams[] and detach or free its runtime while the playback trigger path still holds a stale peer substream pointer. Keep a per-cable count of in-flight peer stops before dropping cable->lock, and make free_cable() wait for those stops before detaching the runtime. This preserves the existing behavior while making the peer runtime lifetime explicit.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-07-20

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-2026-46090 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 2.6.37 and later are affected. Fixed in 5.10.259, 5.15.210, 6.12.88, 6.18.27, 7.0.4, 7.1 and their respective stable series.

Affected from

≥ 2.6.37

Fixed in

✓ 5.10.259 5.10.x ✓ 5.15.210 5.15.x ✓ 6.12.88 6.12.x ✓ 6.18.27 6.18.x ✓ 7.0.4 7.0.x ✓ 7.1

References

23 total

Kernel Git
https://git.kernel.org/stable/c/03f52a9c170431e8f10e156b9dc0dae80b3e9198

Patch
Kernel Git
https://git.kernel.org/stable/c/345c24b2bcf0923dfae1ab41497351c68214ff76

Patch
Kernel Git
https://git.kernel.org/stable/c/5d45e34bf001344e2966dabca1897561bbc9e913

Patch
Kernel Git
https://git.kernel.org/stable/c/83bd62fa9620ac98d5d694bde14c50f98c8e7189

Patch
Kernel Git
https://git.kernel.org/stable/c/bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c

Patch

Showing 5 of 23 references View all on NVD

Details

CVE ID CVE-2026-46090

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-07-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46090?

CVE-2026-46090 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 2.6.37 onward and has been patched in 5.10.259, 5.15.210, 6.12.88 and others. CVE-2026-46090 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46090?

CVE-2026-46090 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-2026-46090?

Yes. CVE-2026-46090 has been patched. Fixed versions include 5.10.259, 5.15.210, 6.12.88 and others. If you are running Linux kernel 2.6.37 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46090 actively exploited?

No. CVE-2026-46090 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.