Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2025-39847

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/09/2025
Last modified:
20/01/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ppp: fix memory leak in pad_compress_skb<br /> <br /> If alloc_skb() fails in pad_compress_skb(), it returns NULL without<br /> releasing the old skb. The caller does:<br /> <br /> skb = pad_compress_skb(ppp, skb);<br /> if (!skb)<br /> goto drop;<br /> <br /> drop:<br /> kfree_skb(skb);<br /> <br /> When pad_compress_skb() returns NULL, the reference to the old skb is<br /> lost and kfree_skb(skb) ends up doing nothing, leading to a memory leak.<br /> <br /> Align pad_compress_skb() semantics with realloc(): only free the old<br /> skb if allocation and compression succeed. At the call site, use the<br /> new_skb variable so the original skb is not lost when pad_compress_skb()<br /> fails.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 2.6.15 (including) 5.4.299 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5 (including) 5.10.243 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.192 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.151 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.105 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.46 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.16.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools