Vulnerability-Lookup

GHSA-FP4C-F74P-8CG7

Vulnerability from github – Published: 2025-06-30 09:30 – Updated: 2025-11-19 15:31

Details

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

net/sched: fix use-after-free in taprio_dev_notifier

Since taprio’s taprio_dev_notifier() isn’t protected by an RCU read-side critical section, a race with advance_sched() can lead to a use-after-free.

Adding rcu_read_lock() inside taprio_dev_notifier() prevents this.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38087"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-30T08:15:22Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in taprio_dev_notifier\n\nSince taprio\u2019s taprio_dev_notifier() isn\u2019t protected by an\nRCU read-side critical section, a race with advance_sched()\ncan lead to a use-after-free.\n\nAdding rcu_read_lock() inside taprio_dev_notifier() prevents this.",
  "id": "GHSA-fp4c-f74p-8cg7",
  "modified": "2025-11-19T15:31:32Z",
  "published": "2025-06-30T09:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a008c89e5e5c5332e4c0a33d707db9ddd529f8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1547d28ba468bc3b88764efd13e4319bab63be8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b160766e26d4e2e2d6fe2294e0b02f92baefcec5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38087 (GCVE-0-2025-38087)

Vulnerability from cvelistv5 – Published: 2025-06-30 07:29 – Updated: 2026-08-05 11:59

Title

net/sched: fix use-after-free in taprio_dev_notifier

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix use-after-free in taprio_dev_notifier Since taprio’s taprio_dev_notifier() isn’t protected by an RCU read-side critical section, a race with advance_sched() can lead to a use-after-free. Adding rcu_read_lock() inside taprio_dev_notifier() prevents this.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/8c5713ce1ced75f9e…
https://git.kernel.org/stable/c/8a008c89e5e5c5332…
https://git.kernel.org/stable/c/b1547d28ba468bc3b…
https://git.kernel.org/stable/c/b160766e26d4e2e2d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fed87cc6718ad5f80aa739fee3c5979a8b09d3a6 , < 8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c (git) Affected: fed87cc6718ad5f80aa739fee3c5979a8b09d3a6 , < 8a008c89e5e5c5332e4c0a33d707db9ddd529f8a (git) Affected: fed87cc6718ad5f80aa739fee3c5979a8b09d3a6 , < b1547d28ba468bc3b88764efd13e4319bab63be8 (git) Affected: fed87cc6718ad5f80aa739fee3c5979a8b09d3a6 , < b160766e26d4e2e2d6fe2294e0b02f92baefcec5 (git)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.95 , ≤ 6.6.* (semver) Unaffected: 6.12.35 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c",
              "status": "affected",
              "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
              "versionType": "git"
            },
            {
              "lessThan": "8a008c89e5e5c5332e4c0a33d707db9ddd529f8a",
              "status": "affected",
              "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
              "versionType": "git"
            },
            {
              "lessThan": "b1547d28ba468bc3b88764efd13e4319bab63be8",
              "status": "affected",
              "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
              "versionType": "git"
            },
            {
              "lessThan": "b160766e26d4e2e2d6fe2294e0b02f92baefcec5",
              "status": "affected",
              "version": "fed87cc6718ad5f80aa739fee3c5979a8b09d3a6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.95",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.35",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.4",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in taprio_dev_notifier\n\nSince taprio\u2019s taprio_dev_notifier() isn\u2019t protected by an\nRCU read-side critical section, a race with advance_sched()\ncan lead to a use-after-free.\n\nAdding rcu_read_lock() inside taprio_dev_notifier() prevents this."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached by configuring a taprio qdisc and triggering netdev notifier events via rtnetlink/netlink from the local system. Per kernel guidance, tc/netlink qdisc bugs are Local.\nAC:L - The attacker controls both sides of the race \u2014 the schedule cycle time (driving advance_sched()\u0027s call_rcu() free at ~48\u00b5s intervals) and the NETDEV_UP/NETDEV_CHANGE events that re-enter the unprotected notifier \u2014 and can retry indefinitely, with the window widened further on the PREEMPT/PREEMPT_RT kernels typical of TSN deployments.\nPR:L - Only CAP_NET_ADMIN within a network namespace is needed, which any unprivileged user obtains via `unshare -Urn` since rtnetlink uses namespace-scoped netlink_net_capable(); the required multiqueue device is created as a veth with IFLA_NUM_TX_QUEUES.\nUI:N - The attacker performs all steps \u2014 qdisc creation, schedule replacement, and link state changes \u2014 entirely on their own. No victim action is involved.\nS:U - The corruption is confined to kernel heap memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free reads max_open_gate_duration[] and cycle_time from a freed, attacker-sprayable kmalloc-512 object, and with heap grooming a UAF of this kind yields an arbitrary kernel memory read primitive.\nI:H - taprio_update_queue_max_sdu() writes 32 attacker-influenced u32 values (derived from the user-supplied TCA_TAPRIO_TC_ENTRY_MAX_SDU) into fixed offsets 128\u2013255 of the freed object, giving a controlled-value write into a reclaimed general-purpose slab object that is exploitable for control-flow hijacking.\nA:H - The use-after-free corrupts arbitrary reclaimed kernel objects and reliably causes oops/panic, and the race can be re-triggered in a loop for repeated crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:24.523Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8c5713ce1ced75f9e9ed5c642ea3d2ba06ead69c"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a008c89e5e5c5332e4c0a33d707db9ddd529f8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1547d28ba468bc3b88764efd13e4319bab63be8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b160766e26d4e2e2d6fe2294e0b02f92baefcec5"
        }
      ],
      "title": "net/sched: fix use-after-free in taprio_dev_notifier",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38087",
    "datePublished": "2025-06-30T07:29:43.325Z",
    "dateReserved": "2025-04-16T04:51:23.982Z",
    "dateUpdated": "2026-08-05T11:59:24.523Z",
    "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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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