What is CVE-2025-39793?

CVE-2025-39793 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.14 onward and patched in 6.15.11, 6.16.2 and 6.17. CVE-2025-39793 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39793?

CVE-2025-39793 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-2025-39793?

Yes, CVE-2025-39793 has been patched. Fixed versions include 6.15.11, 6.16.2 and 6.17. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39793 actively exploited?

CVE-2025-39793 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-39793

High

In the Linux kernel, the following vulnerability has been resolved: io_uring/memmap: cast nr_pages to size_t before shifting If the allocated size exceeds UINT_MAX, then it's necessary to cast the mr->nr_pages value to size_t to prevent it from overflowing. In practice this isn't much of a concern as the required memory size will have been validated upfront, and accounted to the user. And > 4GB sizes will be necessary to make the lack of a cast a problem, which greatly exceeds normal user locked_vm settings that are generally in the kb to mb range. However, if root is used, then accounting isn't done, and then it's possible to hit this issue.

Package Linux Kernel

Published 2025-09-12

Last modified 2025-11-25

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

Affected versions

Linux kernel versions 6.14 and later are affected. Fixed in 6.15.11, 6.16.2, 6.17 and their respective stable series.

Affected from

≥ 6.14

Fixed in

✓ 6.15.11 6.15.x ✓ 6.16.2 6.16.x ✓ 6.17

References

The following references provide additional information about CVE-2025-39793 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/33503c083fda048c77903460ac0429e1e2c0e341
Patch
Kernel patch commit
https://git.kernel.org/stable/c/a69a9b53c54e2d33e2a5b1ea4a9a71fd01c6cf3a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/c6a2706e08b8a1b2d3740161c0977d38e596c1ee
Patch

Details

CVE ID CVE-2025-39793

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-09-12

Modified 2025-11-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39793?

CVE-2025-39793 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 6.14 onward and has been patched in 6.15.11, 6.16.2 and 6.17. CVE-2025-39793 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39793?

CVE-2025-39793 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-2025-39793?

Yes — CVE-2025-39793 has been patched. Fixed versions include 6.15.11, 6.16.2 and 6.17. If you are running Linux kernel 6.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39793 actively exploited?

No — CVE-2025-39793 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.