What is CVE-2026-45993?

CVE-2026-45993 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.19 onward and patched in 6.1.176, 6.6.140, 6.12.86 and others. CVE-2026-45993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45993?

CVE-2026-45993 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-45993?

Yes, CVE-2026-45993 has been patched. Fixed versions include 6.1.176, 6.6.140, 6.12.86 and others. If you are running Linux kernel 5.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45993 actively exploited?

CVE-2026-45993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45993

Medium

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Add spectre boundry for syscall dispatch table The LoongArch syscall number is directly controlled by userspace, but does not have a array_index_nospec() boundry to prevent access past the syscall function pointer tables.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-19

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.19 and later are affected. Fixed in 6.1.176, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1 and their respective stable series.

Affected from

≥ 5.19

Fixed in

✓ 6.1.176 6.1.x ✓ 6.6.140 6.6.x ✓ 6.12.86 6.12.x ✓ 6.18.27 6.18.x ✓ 7.0.4 7.0.x ✓ 7.1

References

6 total

Kernel Git
https://git.kernel.org/stable/c/07040904ad217545be096d4280ed33c02f6a3750

Patch
Kernel Git
https://git.kernel.org/stable/c/0c965d2784fbbd7f8e3b96d875c9cfdf7c00da3d

Patch
Kernel Git
https://git.kernel.org/stable/c/108f2cd13577a410c0ad6ea00708596d9d0dfc90

Patch
Kernel Git
https://git.kernel.org/stable/c/85cbf7fb568af5358aae61925c4e66b8f5e1439d

Patch
Kernel Git
https://git.kernel.org/stable/c/bc84a109c2082dd0c4b38e8d923c046b41977533

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-45993

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45993?

CVE-2026-45993 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.19 onward and has been patched in 6.1.176, 6.6.140, 6.12.86 and others. CVE-2026-45993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45993?

CVE-2026-45993 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-45993?

Yes. CVE-2026-45993 has been patched. Fixed versions include 6.1.176, 6.6.140, 6.12.86 and others. If you are running Linux kernel 5.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45993 actively exploited?

No. CVE-2026-45993 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.