net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP If one TCA_TAPRIO_ATTR_PRIOMAP attribute has been provided, taprio_parse_mqprio_opt() must validate it, or userspace can inject arbitrary data to the kernel, the second time taprio_change() is called. First call (with valid attributes) sets dev->num_tc to a non zero value. Second call (with arbitrary mqprio attributes) returns early from taprio_parse_mqprio_opt() and bad things can happen.

Timeline

1. Jun 18, 2024, 7:15 PM UTCCVE published
2. Sep 10, 2024, 5:15 PM UTCCISA SSVC assessment

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

3. Oct 15, 2026, 12:43 AM UTCRecord last updated

Affected versions

• Linux Linux

  From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in c6041e7124464ce7e896ee3f912897ce88a0c4ec; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in 6db4af09987cc5d5f0136bd46148b0e0460dae5b; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in d3dde4c217f0c31ab0621912e682b57e677dd923; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in 0bf6cc96612bd396048f57d63f1ad454a846e39c; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in 724050ae4b76e4fae05a923cb54101d792cf4404; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in c37a27a35eadb59286c9092c49c241270c802ae2; From a3d43c0d56f1b94e74963a2fbadfb70126d92213 · fixed in f921a58ae20852d188f70842431ce6519c4fdc36

• Linux Linux

  5.2

• KernelLinux

  From 5.2.0 · fixed in 5.4.279; From 5.5.0 · fixed in 5.10.221; From 5.11.0 · fixed in 5.15.162; From 5.16.0 · fixed in 6.1.95; From 6.2.0 · fixed in 6.6.35; From 6.7.0 · fixed in 6.9.6

References 7