What is CVE-2025-39849?

CVE-2025-39849 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 6.1.16 onward and patched in 6.1.151, 6.6.105, 6.12.46 and others. CVE-2025-39849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39849?

CVE-2025-39849 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-2025-39849?

Yes, CVE-2025-39849 has been patched. Fixed versions include 6.1.151, 6.6.105, 6.12.46 and others. If you are running Linux kernel 6.1.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39849 actively exploited?

CVE-2025-39849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2025-39849

High

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() If the ssid->datalen is more than IEEE80211_MAX_SSID_LEN (32) it would lead to memory corruption so add some bounds checking.

Package Linux Kernel

Published 2025-09-19

Last modified 2026-05-12

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

Weakness type

CWE-787

CVE-2025-39849 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.1.16, 6.2.3, 6.3 and later are affected. Fixed in 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17 and their respective stable series.

Affected from

≥ 6.1.16 ≥ 6.2.3 ≥ 6.3

Fixed in

✓ 6.1.151 6.1.x ✓ 6.6.105 6.6.x ✓ 6.12.46 6.12.x ✓ 6.16.6 6.16.x ✓ 6.17

References

7 total

Kernel Git
https://git.kernel.org/stable/c/31229145e6ba5ace3e9391113376fa05b7831ede

Patch
Kernel Git
https://git.kernel.org/stable/c/5cb7cab7adf9b1e6a99e2081b0e30e9e59d07523

Patch
Kernel Git
https://git.kernel.org/stable/c/62b635dcd69c4fde7ce1de4992d71420a37e51e3

Patch
Kernel Git
https://git.kernel.org/stable/c/8e751d46336205abc259ed3990e850a9843fb649

Patch
Kernel Git
https://git.kernel.org/stable/c/e472f59d02c82b511bc43a3f96d62ed08bf4537f

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2025-39849

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2025-09-19

Modified 2026-05-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-39849?

CVE-2025-39849 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 6.1.16 onward and has been patched in 6.1.151, 6.6.105, 6.12.46 and others. CVE-2025-39849 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39849?

CVE-2025-39849 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-2025-39849?

Yes. CVE-2025-39849 has been patched. Fixed versions include 6.1.151, 6.6.105, 6.12.46 and others. If you are running Linux kernel 6.1.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39849 actively exploited?

No. CVE-2025-39849 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.