CVE-2024-50127: net: sched: fix use-after-free in taprio_change()

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-05 · updated 2026-10-15
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix use-after-free in taprio_change() In 'taprio_change()', 'admin' pointer may become dangling due to sched switch / removal caused by 'advance_sched()', and critical section protected by 'q->current_entry_lock' is too small to prevent from such a scenario (which causes use-after-free detected by KASAN). Fix this by prefer 'rcu_replace_pointer()' over 'rcu_assign_pointer()' to update 'admin' immediately before an attempt to schedule freeing.

Affected products

Linux kernel: from 5.2 before 5.15.170; from 5.16 before 6.1.115; from 6.2 before 6.6.59; from 6.7 before 6.11.6; 6.12-rc1, 6.12-rc2, 6.12-rc3, 6.12-rc4 — fixed in 5.15.170, 6.1.115, 6.11.6, 6.6.59

How to fix

Upgrade to a fixed version: Linux kernel 5.15.170, 6.1.115, 6.11.6, 6.6.59. Check the vendor advisory for mitigations.

References

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