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CVE-2026-72297

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 1a6dda72455b399ce9c1a12695471dc4d5c61add; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 2b3e241729e87afed13ac0f666472d5d6ca42e87; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 367acd288bc6255e247cb1a1efbf5c6567cab423; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 513f820b3f0cf4462e17d84c39ed3948d061a6ea; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 806b7b6edc8446e8b94b706807a7090a14d47b5c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in cdf19f380e46192e7084be559638aab1f6ed86a2

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org