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.

https://git.kernel.org/stable/c/15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5

https://git.kernel.org/stable/c/1a6dda72455b399ce9c1a12695471dc4d5c61add

https://git.kernel.org/stable/c/2b3e241729e87afed13ac0f666472d5d6ca42e87

https://git.kernel.org/stable/c/367acd288bc6255e247cb1a1efbf5c6567cab423

https://git.kernel.org/stable/c/513f820b3f0cf4462e17d84c39ed3948d061a6ea

https://git.kernel.org/stable/c/806b7b6edc8446e8b94b706807a7090a14d47b5c

https://git.kernel.org/stable/c/cdf19f380e46192e7084be559638aab1f6ed86a2

https://git.kernel.org/stable/c/e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["net/atm/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"1a6dda72455b399ce9c1a12695471dc4d5c61add","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"2b3e241729e87afed13ac0f666472d5d6ca42e87","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"367acd288bc6255e247cb1a1efbf5c6567cab423","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"513f820b3f0cf4462e17d84c39ed3948d061a6ea","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"806b7b6edc8446e8b94b706807a7090a14d47b5c","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cdf19f380e46192e7084be559638aab1f6ed86a2","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["net/atm/common.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","versionType":"semver","status":"unaffected"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]