What is CVE-2025-39839?

CVE-2025-39839 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 3.10 onward and patched in 5.4.299, 5.10.243, 5.15.192 and others. CVE-2025-39839 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-39839?

CVE-2025-39839 has a CVSS score of 7.1 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:N/A:H.

Is there a patch available for CVE-2025-39839?

Yes, CVE-2025-39839 has been patched. Fixed versions include 5.4.299, 5.10.243, 5.15.192 and others. If you are running Linux kernel 3.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-39839 actively exploited?

CVE-2025-39839 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2025-39839

High

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix OOB read/write in network-coding decode batadv_nc_skb_decode_packet() trusts coded_len and checks only against skb->len. XOR starts at sizeof(struct batadv_unicast_packet), reducing payload headroom, and the source skb length is not verified, allowing an out-of-bounds read and a small out-of-bounds write. Validate that coded_len fits within the payload area of both destination and source sk_buffs before XORing.

Package Linux Kernel

Published 2025-09-19

Last modified 2026-05-12

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2025-39839 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

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

Affected versions

Linux kernel versions 3.10 and later are affected. Fixed in 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6, 6.17 and their respective stable series.

Affected from

≥ 3.10

Fixed in

✓ 5.4.299 5.4.x ✓ 5.10.243 5.10.x ✓ 5.15.192 5.15.x ✓ 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

12 total

Kernel Git
https://git.kernel.org/stable/c/1e36c6c8dc8023b4bbe9a16e819f9998b9b6a183

Patch
Kernel Git
https://git.kernel.org/stable/c/20080709457bc1e920eb002483d7d981d9b2ac1c

Patch
Kernel Git
https://git.kernel.org/stable/c/30fc47248f02b8a14a61df469e1da4704be1a19f

Patch
Kernel Git
https://git.kernel.org/stable/c/5d334bce9fad58cf328d8fa14ea1fff855819863

Patch
Kernel Git
https://git.kernel.org/stable/c/a67c6397fcb7e842d3c595243049940970541c48

Patch

Showing 5 of 12 references View all on NVD

Details

CVE ID CVE-2025-39839

Severity High

CVSS score 7.1 / 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-2025-39839?

CVE-2025-39839 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 3.10 onward and has been patched in 5.4.299, 5.10.243, 5.15.192 and others. CVE-2025-39839 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-39839?

CVE-2025-39839 has a CVSS score of 7.1 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:N/A:H.
Is there a patch available for CVE-2025-39839?

Yes. CVE-2025-39839 has been patched. Fixed versions include 5.4.299, 5.10.243, 5.15.192 and others. If you are running Linux kernel 3.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-39839 actively exploited?

No. CVE-2025-39839 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.