What is CVE-2026-74608?

CVE-2026-74608 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 6.1.78 onward and patched in 6.1.183, 6.6.152, 6.12.104 and others. CVE-2026-74608 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-74608?

CVE-2026-74608 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-74608?

Yes, CVE-2026-74608 has been patched. Fixed versions include 6.1.183, 6.6.152, 6.12.104 and others. If you are running Linux kernel 6.1.78 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-74608 actively exploited?

CVE-2026-74608 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-74608

Critical

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels() cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.

Package Linux Kernel

Published 2026-08-22

Last modified 2026-08-25

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.1.78, 6.6.17, 6.7.5, 6.8 and later are affected. Fixed in 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9, 7.2 and their respective stable series.

Affected from

≥ 6.1.78 ≥ 6.6.17 ≥ 6.7.5 ≥ 6.8

Fixed in

✓ 6.1.183 6.1.x ✓ 6.6.152 6.6.x ✓ 6.12.104 6.12.x ✓ 6.18.45 6.18.x ✓ 7.1.9 7.1.x ✓ 7.2

References

6 total

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-74608

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-08-22

Modified 2026-08-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-74608?

CVE-2026-74608 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 6.1.78 onward and has been patched in 6.1.183, 6.6.152, 6.12.104 and others. CVE-2026-74608 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-74608?

CVE-2026-74608 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-74608?

Yes. CVE-2026-74608 has been patched. Fixed versions include 6.1.183, 6.6.152, 6.12.104 and others. If you are running Linux kernel 6.1.78 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-74608 actively exploited?

No. CVE-2026-74608 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.