« Volver al listado

CVE-2025-37890

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc

As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case).

This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case.

Leer descripción completaMostrar menos

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CVE afecta al kernel de Linux con AV:L/PR:L (acceso local con privilegios). UAF en qdisc permite corrupción de memoria, facilitando escalada de privilegios (T1068) y ejecución de código (T1059).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-37890",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-37890",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-10T20:42:08.844756Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "273bbcfa53541cde38b2003ad88a59b770306421",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "e0cf8ee23e1915431f262a7b2dee0c7a7d699af0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "e3e949a39a91d1f829a4890e7dfe9417ac72e4d0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "8df7d37d626430035b413b97cee18396b3450bef",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "6082a87af4c52f58150d40dec1716011d871ac21",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "2e7093c7a8aba5d4f8809f271488e5babe75e202",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "ac39fd4a757584d78ed062d4f6fd913f83bd98b5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "lessThan": "141d34391abbb315d68556b7c67ad97885407547",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/sched/sch_hfsc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.294",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.238",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.182",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.138",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.90",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.28",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.14.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sched/sch_hfsc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-05-16T13:15:52.437",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html",
      "tags": [
        "Mailing List"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
      "tags": [
        "Mailing List"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc\n\nAs described in Gerrard's report [1], we have a UAF case when an hfsc class\nhas a netem child qdisc. The crux of the issue is that hfsc is assuming\nthat checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted\nthe class in the vttree or eltree (which is not true for the netem\nduplicate case).\n\nThis patch checks the n_active class variable to make sure that the code\nwon't insert the class in the vttree or eltree twice, catering for the\nreentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: hfsc: corrige una vulnerabilidad UAF en la clase con netem como qdisc hijo Como se describe en el informe de Gerrard [1], tenemos un caso UAF cuando una clase hfsc tiene una qdisc hijo netem. El quid de la cuestión es que hfsc asume que la comprobación de cl->qdisc->q.qlen == 0 garantiza que no ha insertado la clase en vttree o eltree (lo que no es cierto para el caso de duplicado de netem). Este parche comprueba la variable de clase n_active para asegurarse de que el código no inserte la clase en vttree o eltree dos veces, atendiendo al caso reentrante. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"
    }
  ],
  "lastModified": "2026-07-30T06:22:28.833",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DEC27C91-8035-49D5-8C57-B8F8541B23F7",
              "versionEndExcluding": "5.4.294",
              "versionStartIncluding": "5.0.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0DAAEF7F-D560-47FC-8B65-20404DB82432",
              "versionEndExcluding": "5.10.238",
              "versionStartIncluding": "5.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "57E76AE8-79D9-4EC8-9845-9A86B1ED152E",
              "versionEndExcluding": "5.15.182",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B6266F82-46B4-4D38-AC4A-54C92A1DFAB2",
              "versionEndExcluding": "6.1.138",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2BE1DB09-2D62-4C63-AF19-947300669741",
              "versionEndExcluding": "6.6.90",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5082CE19-0F3D-4521-AB3E-810D8255F500",
              "versionEndExcluding": "6.12.28",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "19E5095E-5950-43EA-8E78-FC860855293F",
              "versionEndExcluding": "6.14.6",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1D0FE595-0CFE-4491-808B-CEF691CE7B0A"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "963CFC36-FBAD-465F-9891-CDBBF962DFDD"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1B084A7A-6047-4804-9395-6000E4A43828"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C3430640-AC87-44BF-ABF5-09E0A97E3758"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FDF49B77-4688-4908-9239-89B729456D22"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "77F342FB-3D7B-4EAE-BF8B-57B7B860BAFD"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.0:rc8:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "47D61679-6515-4E18-83C7-A71982CCD83C"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4C9D071F-B28E-46EC-AC61-22B913390211"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}