CVE-2025-39847 (GCVE-0-2025-39847)
Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-05-12 12:07
VLAI
EPSS
VEX
Title
ppp: fix memory leak in pad_compress_skb
Summary
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.
Severity
5.5 (Medium)
Assigner
References
11 references
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 9ca6a040f76c0b149293e430dabab446f3fc8ab7
(git)
Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 87a35a36742df328d0badf4fbc2e56061c15846c (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 0b21e9cd4559102da798bdcba453b64ecd7be7ee (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8 (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 85c1c86a67e09143aa464e9bf09c397816772348 (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4 (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 33a5bac5f14772730d2caf632ae97b6c2ee95044 (git) Affected: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c , < 4844123fe0b853a4982c02666cb3fd863d701d50 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.15
Unaffected: 0 , < 2.6.15 (semver) Unaffected: 5.4.299 , ≤ 5.4.* (semver) Unaffected: 5.10.243 , ≤ 5.10.* (semver) Unaffected: 5.15.192 , ≤ 5.15.* (semver) Unaffected: 6.1.151 , ≤ 6.1.* (semver) Unaffected: 6.6.105 , ≤ 6.6.* (semver) Unaffected: 6.12.46 , ≤ 6.12.* (semver) Unaffected: 6.16.6 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed |
{
"containers": {
"adp": [
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"providerMetadata": {
"dateUpdated": "2025-11-03T17:44:04.958Z",
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{
"lessThanOrEqual": "5.10.*",
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"version": "5.10.243",
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}
],
"providerMetadata": {
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{
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"url": "https://git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8"
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"url": "https://git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4"
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{
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"cveId": "CVE-2025-39847",
"datePublished": "2025-09-19T15:26:20.648Z",
"dateReserved": "2025-04-16T07:20:57.141Z",
"dateUpdated": "2026-05-12T12:07:35.941Z",
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},
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-39847",
"date": "2026-09-16",
"epss": "0.0016",
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"source": "Microsoft CSAF VEX",
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"title": "ppp: fix memory leak in pad_compress_skb",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39847.json",
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},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39847\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-19T16:15:43.513\",\"lastModified\":\"2026-06-17T09:18:36.957\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nppp: fix memory leak in pad_compress_skb\\n\\nIf alloc_skb() fails in pad_compress_skb(), it returns NULL without\\nreleasing the old skb. The caller does:\\n\\n skb = pad_compress_skb(ppp, skb);\\n if (!skb)\\n goto drop;\\n\\ndrop:\\n kfree_skb(skb);\\n\\nWhen pad_compress_skb() returns NULL, the reference to the old skb is\\nlost and kfree_skb(skb) ends up doing nothing, leading to a memory leak.\\n\\nAlign pad_compress_skb() semantics with realloc(): only free the old\\nskb if allocation and compression succeed. At the call site, use the\\nnew_skb variable so the original skb is not lost when 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CN 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:23:23+00:00",
"cve": "CVE-2025-39847",
"id": "CVE-2025-39847",
"initial_release_date": "2025-09-19T00:00:00+00:00",
"product_status:known_affected": "260",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ppp: fix memory leak in pad_compress_skb",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39847.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-01T01:02:00Z",
"cve": "CVE-2025-39847",
"id": "CVE-2025-39847",
"initial_release_date": "2025-09-19T23:23:57Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "727",
"product_status:recommended": "501",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39847",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39847.json",
"version": "50"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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