CVE-2025-21971
In the Linux kernel, the following vulnerability has been resolved:
net_sched: Prevent creation of classes with TC_H_ROOT
The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination
condition when traversing up the qdisc tree to update parent backlog
counters. However, if a class is created with classid TC_H_ROOT, the
traversal terminates prematurely at this class instead of reaching the
actual root qdisc, causing parent statistics to be incorrectly maintained.
In case of DRR, this could lead to a crash as reported by Mingi Cho.
Prevent the creation of any Qdisc class with classid TC_H_ROOT
(0xFFFFFFFF) across all qdisc types, as suggested by Jamal.
https://nvd.nist.gov/vuln/detail/CVE-2025-21971
Categories
No category defined
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CPE
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REMEDIATION
EXPLOITS
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POC Github
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CAPEC
Common Attack Pattern Enumerations and Classifications
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