What is CVE-2026-45945?

CVE-2026-45945 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10, classified as a Race Condition flaw (CWE-362), affecting Linux kernel versions from 6.13 onward and patched in 6.18.39, 6.19.4 and 7.0. CVE-2026-45945 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45945?

CVE-2026-45945 has a CVSS score of 8.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Is there a patch available for CVE-2026-45945?

Yes, CVE-2026-45945 has been patched. Fixed versions include 6.18.39, 6.19.4 and 7.0. If you are running Linux kernel 6.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45945 actively exploited?

CVE-2026-45945 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2026-45945

High

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix race condition during PASID entry replacement The Intel VT-d PASID table entry is 512 bits (64 bytes). When replacing an active PASID entry (e.g., during domain replacement), the current implementation calculates a new entry on the stack and copies it to the table using a single structure assignment. struct pasid_entry *pte, new_pte; pte = intel_pasid_get_entry(dev, pasid); pasid_pte_config_first_level(iommu, &new_pte, ...); *pte = new_pte; Because the hardware may fetch the 512-bit PASID entry in multiple 128-bit chunks, updating the entire entry while it is active (Present bit set) risks a "torn" read. In this scenario, the IOMMU hardware could observe an inconsistent state — partially new data and partially old data — leading to unpredictable behavior or spurious faults. Fix this by removing the unsafe "replace" helpers and following the "clear-then-update" flow, which ensures the Present bit is cleared and the required invalidation handshake is completed before the new configuration is applied.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-07-18

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-362

CVE-2026-45945 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.13 and later are affected. Fixed in 6.18.39, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 6.13

Fixed in

✓ 6.18.39 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

3 total

Kernel Git
https://git.kernel.org/stable/c/66a7aff480a82b8642b3991fed5fdc9780022157

Patch
Kernel Git
https://git.kernel.org/stable/c/c3b1edea3791fa91ab7032faa90355913ad9451b

Patch
Kernel Git
https://git.kernel.org/stable/c/4718007870547e1efebbdd6745d9fce58f008fef

Details

CVE ID CVE-2026-45945

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-07-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45945?

CVE-2026-45945 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 , classified as a Race Condition flaw (CWE-362) . It affects Linux kernel versions from 6.13 onward and has been patched in 6.18.39, 6.19.4 and 7.0. CVE-2026-45945 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45945?

CVE-2026-45945 has a CVSS score of 8.8 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:C/C:H/I:H/A:H.
Is there a patch available for CVE-2026-45945?

Yes. CVE-2026-45945 has been patched. Fixed versions include 6.18.39, 6.19.4 and 7.0. If you are running Linux kernel 6.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45945 actively exploited?

No. CVE-2026-45945 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.