{"id":"CVE-2026-72297","title":"net: atm: reject out-of-range traffic classes in QoS validation","summary":"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 ch…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1a6dda72455b399ce9c1a12695471dc4d5c61add","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2b3e241729e87afed13ac0f666472d5d6ca42e87","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 367acd288bc6255e247cb1a1efbf5c6567cab423","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 513f820b3f0cf4462e17d84c39ed3948d061a6ea","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 806b7b6edc8446e8b94b706807a7090a14d47b5c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cdf19f380e46192e7084be559638aab1f6ed86a2","Linux 2.6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T18:45:57.327476Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:15.534Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72297","references":[{"url":"https://git.kernel.org/stable/c/1a6dda72455b399ce9c1a12695471dc4d5c61add"},{"url":"https://git.kernel.org/stable/c/2b3e241729e87afed13ac0f666472d5d6ca42e87"},{"url":"https://git.kernel.org/stable/c/367acd288bc6255e247cb1a1efbf5c6567cab423"},{"url":"https://git.kernel.org/stable/c/513f820b3f0cf4462e17d84c39ed3948d061a6ea"},{"url":"https://git.kernel.org/stable/c/15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5"},{"url":"https://git.kernel.org/stable/c/e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7"},{"url":"https://git.kernel.org/stable/c/806b7b6edc8446e8b94b706807a7090a14d47b5c"},{"url":"https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2"}],"tags":["cve.org"],"epss":0.00164,"epssPercentile":0.05252,"ingestedAt":"2026-10-16T19:46:24.411Z","slug":"CVE-2026-72297","body":"## Overview\n\nIn 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->qos.\n\nThat bad state later reaches pvc_info(), which indexes class_name[]\nwith vcc->qos.{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.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1a6dda72455b399ce9c1a12695471dc4d5c61add`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2b3e241729e87afed13ac0f666472d5d6ca42e87`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 367acd288bc6255e247cb1a1efbf5c6567cab423`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 513f820b3f0cf4462e17d84c39ed3948d061a6ea`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 806b7b6edc8446e8b94b706807a7090a14d47b5c`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cdf19f380e46192e7084be559638aab1f6ed86a2`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}