What is CVE-2026-80953?

CVE-2026-80953 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10, affecting Linux kernel versions from 6.18 onward and patched in 6.18.50, 7.2.4 and 7.3-rc1. CVE-2026-80953 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80953?

CVE-2026-80953 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-2026-80953?

Yes, CVE-2026-80953 has been patched. Fixed versions include 6.18.50, 7.2.4 and 7.3-rc1. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-80953 actively exploited?

CVE-2026-80953 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80953

High

In the Linux kernel, the following vulnerability has been resolved: i3c: master: adi: initialize the lock before enabling interrupts adi_i3c_master_probe() requests the IRQ and unmasks REG_IRQ_PENDING_CMDR before the controller's IBI state, transfer queue list and transfer queue lock are initialized. A pending CMDR interrupt can therefore run adi_i3c_master_irq() and take master->xferqueue.lock before the dynamic lock has been initialized. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the probe ordering and the IRQ path adi_i3c_master_probe() -> adi_i3c_master_irq() -> xferqueue.lock, with a pending CMDR interrupt arriving after REG_IRQ_PENDING_CMDR is unmasked. Lockdep reported: INFO: trying to register non-static key. you didn't initialize this object before use? lock_acquire+0xbb/0x290 _raw_spin_lock_irqsave+0x36/0x60 adi_i3c_master_irq+0x32/0x56 [vuln_msv] adi_i3c_master_probe+0x5a/0xf47 [vuln_msv] Initialize the transfer queue and IBI state before requesting and unmasking the IRQ.

Package Linux Kernel

Published 2026-09-11

Last modified 2026-09-13

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

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.50, 7.2.4, 7.3-rc1 and their respective stable series.

Affected from

≥ 6.18

Fixed in

✓ 6.18.50 6.18.x ✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

3 total

Details

CVE ID CVE-2026-80953

Severity High

CVSS score 8.4 / 10

CVSS version 3.1

Published 2026-09-11

Modified 2026-09-13

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-80953?

CVE-2026-80953 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10 . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.50, 7.2.4 and 7.3-rc1. CVE-2026-80953 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-80953?

CVE-2026-80953 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-2026-80953?

Yes. CVE-2026-80953 has been patched. Fixed versions include 6.18.50, 7.2.4 and 7.3-rc1. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-80953 actively exploited?

No. CVE-2026-80953 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.