Vulnerability-Lookup

FKIE_CVE-2025-38574

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2026-10-15 22:18

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: pptp: ensure minimal skb length in pptp_xmit() Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data on ppp_sync_txmung") fixed ppp_sync_txmunge() We need a similar fix in pptp_xmit(), otherwise we might read uninit data as reported by syzbot. BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline] ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314 pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Mailing List, Third Party Advisory

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	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
debian	debian_linux	11.0

JSON

To clipboard

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              "lessThanOrEqual": "*",
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              "version": "6.17",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npptp: ensure minimal skb length in pptp_xmit()\n\nCommit aabc6596ffb3 (\"net: ppp: Add bound checking for skb data\non ppp_sync_txmung\") fixed ppp_sync_txmunge()\n\nWe need a similar fix in pptp_xmit(), otherwise we might\nread uninit data as reported by syzbot.\n\nBUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]\n  ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314\n  pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379\n  sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148\n  __release_sock+0x1d3/0x330 net/core/sock.c:3213\n  release_sock+0x6b/0x270 net/core/sock.c:3767\n  pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904\n  sock_sendmsg_nosec net/socket.c:712 [inline]\n  __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n  ____sys_sendmsg+0x893/0xd80 net/socket.c:2566\n  ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n  __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pptp: garantizar la longitud m\u00ednima de skb en pptp_xmit() Se corrigi\u00f3 el commit aabc6596ffb3 (\"net: ppp: agregar verificaci\u00f3n de l\u00edmite para datos skb en ppp_sync_txmung\") ppp_sync_txmunge() Necesitamos una soluci\u00f3n similar en pptp_xmit(); de lo contrario, podr\u00edamos leer datos no inicializados como lo inform\u00f3 syzbot. ERROR: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline] ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314 pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709 "
    }
  ],
  "id": "CVE-2025-38574",
  "lastModified": "2026-10-15T22:18:45.977",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.7,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-38574",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T21:51:52.634407Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-08-19T17:15:34.427",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "Patch"
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      "url": "https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
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      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-38574 (GCVE-0-2025-38574)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2026-10-15 22:02

Title

pptp: ensure minimal skb length in pptp_xmit()

Summary

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 21:51 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

11 references

URL	Tags
https://git.kernel.org/stable/c/97b8c5d322c5c0038…
https://git.kernel.org/stable/c/26672f1679b143aa3…
https://git.kernel.org/stable/c/5de7513f38f3c19c0…
https://git.kernel.org/stable/c/504cc4ab91073d2ac…
https://git.kernel.org/stable/c/5005d24377378a20e…
https://git.kernel.org/stable/c/ea99b88b1999ebcb2…
https://git.kernel.org/stable/c/b7dcda76fd0615c05…
https://git.kernel.org/stable/c/1a04db0fd75cb6034…
https://git.kernel.org/stable/c/de9c4861fb42f0cd7…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 97b8c5d322c5c0038cac4bc56fdbe237d0be426f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 26672f1679b143aa34fca0b6046b7fd0c184770d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5de7513f38f3c19c0610294ee478242bea356f8c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 504cc4ab91073d2ac7404ad146139f86ecee7193 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5005d24377378a20e5c0e53052fc4ebdcdcbc611 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ea99b88b1999ebcb24d5d3a6b7910030f40d3bba (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b7dcda76fd0615c0599c89f36873a6cd48e02dbb (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1a04db0fd75cb6034fc27a56b67b3b8b9022a98c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < de9c4861fb42f0cd72da844c3c34f692d5895b7b (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.148 , ≤ 6.1.* (semver) Unaffected: 6.6.102 , ≤ 6.6.* (semver) Unaffected: 6.12.42 , ≤ 6.12.* (semver) Unaffected: 6.15.10 , ≤ 6.15.* (semver) Unaffected: 6.16.1 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:40:01.333Z",
          "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"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-38574",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:51:52.634407Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T22:02:25.939Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ppp/pptp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "97b8c5d322c5c0038cac4bc56fdbe237d0be426f",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "26672f1679b143aa34fca0b6046b7fd0c184770d",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5de7513f38f3c19c0610294ee478242bea356f8c",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "504cc4ab91073d2ac7404ad146139f86ecee7193",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5005d24377378a20e5c0e53052fc4ebdcdcbc611",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "ea99b88b1999ebcb24d5d3a6b7910030f40d3bba",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "b7dcda76fd0615c0599c89f36873a6cd48e02dbb",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "1a04db0fd75cb6034fc27a56b67b3b8b9022a98c",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "de9c4861fb42f0cd72da844c3c34f692d5895b7b",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ppp/pptp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.297",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.241",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.102",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.1",
              "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": "5.4.297",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.241",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.190",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.148",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.102",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.42",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.10",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npptp: ensure minimal skb length in pptp_xmit()\n\nCommit aabc6596ffb3 (\"net: ppp: Add bound checking for skb data\non ppp_sync_txmung\") fixed ppp_sync_txmunge()\n\nWe need a similar fix in pptp_xmit(), otherwise we might\nread uninit data as reported by syzbot.\n\nBUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]\n  ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314\n  pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379\n  sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148\n  __release_sock+0x1d3/0x330 net/core/sock.c:3213\n  release_sock+0x6b/0x270 net/core/sock.c:3767\n  pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904\n  sock_sendmsg_nosec net/socket.c:712 [inline]\n  __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n  ____sys_sendmsg+0x893/0xd80 net/socket.c:2566\n  ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n  __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The defect is reached from received packets \u2014 `ppp_channel_bridge_input()` passes an unvalidated skb directly to `pptp_xmit()`, and the peer channel can be an internet-routable pppol2tp (UDP/1701) or PPTP-GRE session, whose data-plane frames carry attacker-chosen lengths; the syzbot trace itself shows the receive handler `pppoe_rcv_core()` driving this path.\nAC:L - The attacker simply sends a PPP payload shorter than 3 bytes (or one whose linear head is short); there is no race, no memory-layout dependency, and unlimited retries are possible since each malformed frame is processed independently.\nPR:N - L2TP/PPPoE/PPTP data-plane frames carry no per-packet authentication \u2014 only cleartext tunnel/session/call IDs \u2014 so an off-path or on-segment attacker who observes or guesses those IDs reaches `ppp_input()` with no credentials at all.\nUI:N - The bridged channel is part of the running relay configuration; the attacker triggers the read purely by transmitting a frame, with no action from any local user or administrator.\nS:U - The uninitialized read, the bogus `skb_pull()` and the resulting panic all occur inside the kernel\u0027s own networking authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:L - Up to three bytes of uninitialized kernel heap \u2014 stale tailroom left by a freed object, or the leading `flags`/`meta_len`/`nr_frags` fields of `skb_shared_info` past the linear data \u2014 are read; their values steer whether `ff 03` is prepended and whether a byte is stripped, giving the tunnel peer an observable oracle on kernel memory, but the read is bounded to fixed offsets and is not copied out wholesale.\nI:L - The uninitialized bytes decide `islcp` and the `skb_pull(skb, 1)` in the SC_COMP_PROT branch, so the kernel silently emits PPP frames with a stripped leading byte or spurious address/control framing, corrupting the tunneled data delivered to the peer; there is no arbitrary write or memory corruption.\nA:H - When the bridged skb is nonlinear with `skb_headlen() == 0` and the stale `data[0]` reads as zero under normally-negotiated PFC, `skb_pull(skb, 1)` drives `skb-\u003elen` below `skb-\u003edata_len` and `__skb_pull()` calls `BUG()`, panicking the machine; on KMSAN/`panic_on_warn` builds the uninit read alone is fatal."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:03:02.855Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f"
        },
        {
          "url": "https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193"
        },
        {
          "url": "https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c"
        },
        {
          "url": "https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b"
        }
      ],
      "title": "pptp: ensure minimal skb length in pptp_xmit()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38574",
    "datePublished": "2025-08-19T17:02:53.866Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2026-10-15T22:02:25.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

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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.
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