{"api_version":"1","generated_at":"2026-07-23T16:46:42+00:00","cve":"CVE-2025-39847","urls":{"html":"https://cve.report/CVE-2025-39847","api":"https://cve.report/api/cve/CVE-2025-39847.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-39847","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-39847"},"summary":{"title":"ppp: fix memory leak in pad_compress_skb","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-09-19 16:15:43","updated_at":"2026-05-12 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4100","vendor":"Siemens","versions":[{"lessThan":"V5.0","status":"affected","version":"0","versionType":"custom"}]}],"providerMetadata":{"dateUpdated":"2026-05-12T12:07:35.941Z","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP"},"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}],"x_adpType":"supplier"}],"cna":{"affected":[{"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","versions":[{"lessThan":"9ca6a040f76c0b149293e430dabab446f3fc8ab7","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"87a35a36742df328d0badf4fbc2e56061c15846c","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"0b21e9cd4559102da798bdcba453b64ecd7be7ee","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"85c1c86a67e09143aa464e9bf09c397816772348","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"33a5bac5f14772730d2caf632ae97b6c2ee95044","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"},{"lessThan":"4844123fe0b853a4982c02666cb3fd863d701d50","status":"affected","version":"b3f9b92a6ec1a9a5e4b4b36e484f2f62cc73277c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ppp/ppp_generic.c"],"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:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.299","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.243","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.192","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.151","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.105","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.46","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.16.6","versionStartIncluding":"2.6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17","versionStartIncluding":"2.6.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":"2026-05-11T21:37:35.647Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7"},{"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":{"engine":"bippy-1.2.0"}}},"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":"2026-05-12T12:07:35.941Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-09-19 16:15:43","lastModifiedDate":"2026-05-12 13:17:15","problem_types":["CWE-401"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.15","versionEndExcluding":"5.4.299","matchCriteriaId":"C5C91B27-CCD6-4795-933D-ABD112297A68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.243","matchCriteriaId":"6DE4B49A-F1A3-4F0C-96D3-68676CE6BB4C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.192","matchCriteriaId":"8A911BD7-361F-45C0-A4A6-33FCBA0F6117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.151","matchCriteriaId":"BC2D0B88-F133-4143-B91D-0A439AA143C0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.105","matchCriteriaId":"B9364B0C-6B18-422E-8254-73EF0E856875"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.46","matchCriteriaId":"F7E2B332-E920-4CAC-B400-288602DB6F16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.16.6","matchCriteriaId":"548F104C-0F08-438B-9C97-64C903F0C678"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*","matchCriteriaId":"327D22EF-390B-454C-BD31-2ED23C998A1C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*","matchCriteriaId":"C730CD9A-D969-4A8E-9522-162AAF7C0EE9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*","matchCriteriaId":"39982C4B-716E-4B2F-8196-FA301F47807D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*","matchCriteriaId":"340BEEA9-D70D-4290-B502-FBB1032353B1"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","matchCriteriaId":"FA6FEEC2-9F11-4643-8827-749718254FED"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"39847","Ordinal":"1","Title":"ppp: fix memory leak in pad_compress_skb","CVE":"CVE-2025-39847","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"39847","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ppp: fix memory leak in pad_compress_skb"}]}}}