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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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            "value": "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."
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    "redhat_vex": {
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      "current_release_date": "2026-08-18T23:28:21+00:00",
      "cve": "CVE-2026-72297",
      "id": "CVE-2026-72297",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: atm: reject out-of-range traffic classes in QoS validation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72297.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:27:17Z",
      "cve": "CVE-2026-72297",
      "id": "CVE-2026-72297",
      "initial_release_date": "2026-09-01T13:30:42Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "321",
      "product_status:known_not_affected": "41",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72297",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72297.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.