Vulnerability-Lookup

GHSA-2234-WG35-953C

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

net: atm: reject out-of-range traffic classes in QoS validation

Reject ATM traffic classes above ATM_ANYCLASS in check_tp(). SO_ATMQOS stores the supplied QoS after check_qos() succeeds, so accepting larger values leaves invalid traffic_class values in vcc->qos.

That bad state later reaches pvc_info(), which indexes class_name[] with vcc->qos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause an out-of-bounds read when /proc/net/atm/pvc is read.

Tighten the existing QoS validation so invalid traffic_class values are rejected at the point where user supplied QoS is accepted.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72297"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:02Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: reject out-of-range traffic classes in QoS validation\n\nReject ATM traffic classes above ATM_ANYCLASS in check_tp().\nSO_ATMQOS stores the supplied QoS after check_qos() succeeds, so\naccepting larger values leaves invalid traffic_class values in\nvcc-\u003eqos.\n\nThat bad state later reaches pvc_info(), which indexes class_name[]\nwith vcc-\u003eqos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause\nan out-of-bounds read when /proc/net/atm/pvc is read.\n\nTighten the existing QoS validation so invalid traffic_class values\nare rejected at the point where user supplied QoS is accepted.",
  "id": "GHSA-2234-wg35-953c",
  "modified": "2026-08-17T06:33:22Z",
  "published": "2026-08-15T06:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72297"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a6dda72455b399ce9c1a12695471dc4d5c61add"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b3e241729e87afed13ac0f666472d5d6ca42e87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/367acd288bc6255e247cb1a1efbf5c6567cab423"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/513f820b3f0cf4462e17d84c39ed3948d061a6ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/806b7b6edc8446e8b94b706807a7090a14d47b5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72297 (GCVE-0-2026-72297)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42

Title

net: atm: reject out-of-range traffic classes in QoS validation

Summary

In the Linux kernel, the following vulnerability has been resolved: net: atm: reject out-of-range traffic classes in QoS validation Reject ATM traffic classes above ATM_ANYCLASS in check_tp(). SO_ATMQOS stores the supplied QoS after check_qos() succeeds, so accepting larger values leaves invalid traffic_class values in vcc->qos. That bad state later reaches pvc_info(), which indexes class_name[] with vcc->qos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause an out-of-bounds read when /proc/net/atm/pvc is read. Tighten the existing QoS validation so invalid traffic_class values are rejected at the point where user supplied QoS is accepted.

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1a6dda72455b399ce…
https://git.kernel.org/stable/c/2b3e241729e87afed…
https://git.kernel.org/stable/c/367acd288bc6255e2…
https://git.kernel.org/stable/c/513f820b3f0cf4462…
https://git.kernel.org/stable/c/15444b57fdc6fc3f3…
https://git.kernel.org/stable/c/e62adb157c2eaad9a…
https://git.kernel.org/stable/c/806b7b6edc8446e8b…
https://git.kernel.org/stable/c/cdf19f380e46192e7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1a6dda72455b399ce9c1a12695471dc4d5c61add (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2b3e241729e87afed13ac0f666472d5d6ca42e87 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 367acd288bc6255e247cb1a1efbf5c6567cab423 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 513f820b3f0cf4462e17d84c39ed3948d061a6ea (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 806b7b6edc8446e8b94b706807a7090a14d47b5c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cdf19f380e46192e7084be559638aab1f6ed86a2 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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              "version": "2.6.12"
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            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
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              "status": "unaffected",
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              "value": "AV:L - Exploitation requires local setsockopt(SO_ATMQOS) on an AF_ATMPVC socket and reading /proc/net/atm/pvc; no remote network packet or protocol handler reaches check_tp() or pvc_info().\nAC:L - On systems with an existing ATM PVC device, an attacker deterministically sets an out-of-range traffic_class via SO_ATMQOS before connect and triggers the OOB read by reading /proc/net/atm/pvc with no race or special memory layout needed.\nPR:L - No capability check guards SO_ATMQOS on unconnected sockets; any unprivileged local user in init_net can create AF_ATMPVC sockets (module autoloadable) and read world-readable /proc/net/atm/pvc without CAP_NET_ADMIN.\nUI:N - The attacker controls both poisoning vcc-\u003eqos via setsockopt and triggering pvc_info() by reading procfs; no victim action or cooperation is required.\nS:U - Impact is kernel memory disclosure within the host kernel security boundary; no VM escape, IOMMU bypass, or sandbox boundary crossing occurs.\nC:H - Out-of-bounds indexing of class_name[] loads adjacent kernel pointers that seq_printf() dereferences with %s, disclosing kernel memory contents into the procfs read buffer visible to the attacker.\nI:N - The flaw is an out-of-bounds read of static pointer tables with no memory corruption, arbitrary write, or control-flow hijack primitive; kernel or user data integrity is not modified.\nA:H - Dereferencing attacker-influenced out-of-bounds pointers via %s can fault on unmappable addresses and oops the kernel; even without reliable crash, OOB kernel reads carry high availability risk per conservative scoring."
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        "dateUpdated": "2026-08-17T05:42:30.264Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
        {
          "url": "https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2"
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      "title": "net: atm: reject out-of-range traffic classes in QoS validation",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72297",
    "datePublished": "2026-08-15T05:55:17.877Z",
    "dateReserved": "2026-08-09T03:40:39.917Z",
    "dateUpdated": "2026-08-17T05:42:30.264Z",
    "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.

Action not permitted

GHSA-2234-WG35-953C

CVE-2026-72297 (GCVE-0-2026-72297)

Tags

Sightings

Nomenclature