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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00032.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Linux
  • Linux Kernel
References
Link Providers
https://git.kernel.org/stable/c/0b21e9cd4559102da798bdcba453b64ecd7be7ee cve-icon cve-icon
https://git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8 cve-icon cve-icon
https://git.kernel.org/stable/c/33a5bac5f14772730d2caf632ae97b6c2ee95044 cve-icon cve-icon
https://git.kernel.org/stable/c/4844123fe0b853a4982c02666cb3fd863d701d50 cve-icon cve-icon
https://git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4 cve-icon cve-icon
https://git.kernel.org/stable/c/85c1c86a67e09143aa464e9bf09c397816772348 cve-icon cve-icon
https://git.kernel.org/stable/c/87a35a36742df328d0badf4fbc2e56061c15846c cve-icon cve-icon
https://git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025091903-CVE-2025-39847-6ac1@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-39847 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-39847 cve-icon
History

Mon, 22 Sep 2025 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Sat, 20 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-772
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Fri, 19 Sep 2025 15:30:00 +0000

Type Values Removed Values Added
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.
Title ppp: fix memory leak in pad_compress_skb
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-09-29T06:00:57.392Z

Reserved: 2025-04-16T07:20:57.141Z

Link: CVE-2025-39847

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-19T16:15:43.513

Modified: 2025-09-22T21:23:01.543

Link: CVE-2025-39847

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-09-19T00:00:00Z

Links: CVE-2025-39847 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-09-22T10:06:19Z