CVE-2025-39847 (GCVE-0-2025-39847)
Vulnerability from cvelistv5
Published
2025-09-19 15:26
Modified
2025-09-29 06:00
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c Version: b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c |
||||||
|
|||||||||
{
"containers": {
"cna": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ppp/ppp_generic.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
},
{
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},
{
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{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.15"
},
{
"lessThan": "2.6.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.299",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.243",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.192",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
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},
{
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}
],
"negate": false,
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}
],
"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 pad_compress_skb()\nfails."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-29T06:00:57.392Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7"
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{
"url": "https://git.kernel.org/stable/c/87a35a36742df328d0badf4fbc2e56061c15846c"
},
{
"url": "https://git.kernel.org/stable/c/0b21e9cd4559102da798bdcba453b64ecd7be7ee"
},
{
"url": "https://git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8"
},
{
"url": "https://git.kernel.org/stable/c/85c1c86a67e09143aa464e9bf09c397816772348"
},
{
"url": "https://git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4"
},
{
"url": "https://git.kernel.org/stable/c/33a5bac5f14772730d2caf632ae97b6c2ee95044"
},
{
"url": "https://git.kernel.org/stable/c/4844123fe0b853a4982c02666cb3fd863d701d50"
}
],
"title": "ppp: fix memory leak in pad_compress_skb",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39847",
"datePublished": "2025-09-19T15:26:20.648Z",
"dateReserved": "2025-04-16T07:20:57.141Z",
"dateUpdated": "2025-09-29T06:00:57.392Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39847\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-19T16:15:43.513\",\"lastModified\":\"2025-09-22T21:23:01.543\",\"vulnStatus\":\"Awaiting Analysis\",\"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 pad_compress_skb()\\nfails.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b21e9cd4559102da798bdcba453b64ecd7be7ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33a5bac5f14772730d2caf632ae97b6c2ee95044\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4844123fe0b853a4982c02666cb3fd863d701d50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85c1c86a67e09143aa464e9bf09c397816772348\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87a35a36742df328d0badf4fbc2e56061c15846c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}