ppp: fix memory leak in pad_compress_skb

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39847
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-19 16:15:43 UTC
Updated2026-05-12 13:17:15 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-401

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 9ca6a040f76c0b149293e430dabab446f3fc8ab7 git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 87a35a36742df328d0badf4fbc2e56061c15846c git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 0b21e9cd4559102da798bdcba453b64ecd7be7ee git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8 git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 85c1c86a67e09143aa464e9bf09c397816772348 git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4 git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 33a5bac5f14772730d2caf632ae97b6c2ee95044 git Not specified
CNA Linux Linux affected b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c 4844123fe0b853a4982c02666cb3fd863d701d50 git Not specified
CNA Linux Linux affected 2.6.15 Not specified
CNA Linux Linux unaffected 2.6.15 semver Not specified
CNA Linux Linux unaffected 5.4.299 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.243 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.192 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.151 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.105 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.46 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.6 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/87a35a36742df328d0badf4fbc2e56061c15846c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/0b21e9cd4559102da798bdcba453b64ecd7be7ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/33a5bac5f14772730d2caf632ae97b6c2ee95044 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4844123fe0b853a4982c02666cb3fd863d701d50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/85c1c86a67e09143aa464e9bf09c397816772348 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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