Vulnerability-Lookup

GHSA-3PHQ-R8Q7-GF9J

Vulnerability from github – Published: 2026-01-25 15:30 – Updated: 2026-01-25 15:30

Details

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

net/sched: sch_qfq: do not free existing class in qfq_change_class()

Fixes qfq_change_class() error case.

cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22999"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-25T15:15:54Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: do not free existing class in qfq_change_class()\n\nFixes qfq_change_class() error case.\n\ncl-\u003eqdisc and cl should only be freed if a new class and qdisc\nwere allocated, or we risk various UAF.",
  "id": "GHSA-3phq-r8q7-gf9j",
  "modified": "2026-01-25T15:30:27Z",
  "published": "2026-01-25T15:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22999"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-22999 (GCVE-0-2026-22999)

Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-01-25 14:36

Title

net/sched: sch_qfq: do not free existing class in qfq_change_class()

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: do not free existing class in qfq_change_class() Fixes qfq_change_class() error case. cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/362e269bb03f7076b…
	https://git.kernel.org/stable/c/e9d8f11652fa08c64…
	https://git.kernel.org/stable/c/3879cffd9d07aa037…

Impacted products

Vendor

Product

Version

Linux

Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 362e269bb03f7076ba9990e518aeddb898232e50 (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < e9d8f11652fa08c647bf7bba7dd8163241a332cd (git)
Affected: 462dbc9101acd38e92eda93c0726857517a24bbd , < 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78 (git)

Linux

Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc6 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_qfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "362e269bb03f7076ba9990e518aeddb898232e50",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "e9d8f11652fa08c647bf7bba7dd8163241a332cd",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "3879cffd9d07aa0377c4b8835c4f64b4fb24ac78",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_qfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.7",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc6",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: do not free existing class in qfq_change_class()\n\nFixes qfq_change_class() error case.\n\ncl-\u003eqdisc and cl should only be freed if a new class and qdisc\nwere allocated, or we risk various UAF."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-25T14:36:13.909Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50"
        },
        {
          "url": "https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78"
        }
      ],
      "title": "net/sched: sch_qfq: do not free existing class in qfq_change_class()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-22999",
    "datePublished": "2026-01-25T14:36:13.909Z",
    "dateReserved": "2026-01-13T15:37:45.938Z",
    "dateUpdated": "2026-01-25T14:36:13.909Z",
    "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

GHSA-3PHQ-R8Q7-GF9J

CVE-2026-22999 (GCVE-0-2026-22999)

Tags

Sightings

Nomenclature