CVE-2025-39847

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2025-09-19 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

Description

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

Weakness Classification (1)

CWE-401

Affected Software (15)

Vendor	Product	Version
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 9ca6a040f76c0b149293e430dabab446f3fc8ab7
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 87a35a36742df328d0badf4fbc2e56061c15846c
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 0b21e9cd4559102da798bdcba453b64ecd7be7ee
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 85c1c86a67e09143aa464e9bf09c397816772348
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 33a5bac5f14772730d2caf632ae97b6c2ee95044
Linux	Linux	b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c < 4844123fe0b853a4982c02666cb3fd863d701d50
Linux	Linux	2.6.15
debian	debian_linux	11.0
linux	linux_kernel	2.6.15 – 5.4.299
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17