Vulnerability-Lookup

FKIE_CVE-2025-39847

Vulnerability from fkie_nvd - Published: 2025-09-19 16:15 - Updated: 2026-01-20 15:20

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0b21e9cd4559102da798bdcba453b64ecd7be7ee	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1d8b354eafb8876d8bdb1bef69c7d2438aacfbe8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/33a5bac5f14772730d2caf632ae97b6c2ee95044	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4844123fe0b853a4982c02666cb3fd863d701d50	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/631fc8ab5beb9e0ec8651fb9875b9a968e7b4ae4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/85c1c86a67e09143aa464e9bf09c397816772348	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/87a35a36742df328d0badf4fbc2e56061c15846c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9ca6a040f76c0b149293e430dabab446f3fc8ab7	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory, Mailing List
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory, Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
debian	debian_linux	11.0

JSON

To clipboard

{
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    {
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        {
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              "vulnerable": true
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  "cveTags": [],
  "descriptions": [
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      "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."
    }
  ],
  "id": "CVE-2025-39847",
  "lastModified": "2026-01-20T15:20:07.757",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2025-09-19T16:15:43.513",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}

CVE-2025-39847 (GCVE-0-2025-39847)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2025-11-03 17:44

Title

ppp: fix memory leak in pad_compress_skb

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/9ca6a040f76c0b149…
	https://git.kernel.org/stable/c/87a35a36742df328d…
	https://git.kernel.org/stable/c/0b21e9cd4559102da…
	https://git.kernel.org/stable/c/1d8b354eafb8876d8…
	https://git.kernel.org/stable/c/85c1c86a67e09143a…
	https://git.kernel.org/stable/c/631fc8ab5beb9e0ec…
	https://git.kernel.org/stable/c/33a5bac5f14772730…
	https://git.kernel.org/stable/c/4844123fe0b853a49…

Impacted products

Vendor

Product

Version

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)

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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:44:04.958Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "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": [
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              "versionType": "semver"
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              "version": "5.15.192",
              "versionType": "semver"
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            {
              "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"
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      "cpeApplicability": [
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          "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": [
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          "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": {
        "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": "2025-11-03T17:44:04.958Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2025-39847

CVE-2025-39847 (GCVE-0-2025-39847)

Tags

Sightings

Nomenclature