CVE-2026-72297

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1a6dda72455b399ce9c1a12695471dc4d5c61addaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2b3e241729e87afed13ac0f666472d5d6ca42e87affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 367acd288bc6255e247cb1a1efbf5c6567cab423affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 513f820b3f0cf4462e17d84c39ed3948d061a6eaaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 806b7b6edc8446e8b94b706807a7090a14d47b5caffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cdf19f380e46192e7084be559638aab1f6ed86a2affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References