CVE-2025-38107

In the Linux kernel, the following vulnerability has been resolved: net_sched: ets: fix a race in ets_qdisc_change() Gerrard Tai reported a race condition in ETS, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

CVSS 3.1

7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)

CWE

CWE-362

Published

2025-07-03

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0383b25488a545be168744336847549d4a2d3d6c
• https://git.kernel.org/stable/c/073f64c03516bcfaf790f8edc772e0cfb8a84ec3
• https://git.kernel.org/stable/c/0b479d0aa488cb478eb2e1d8868be946ac8afb4f
• https://git.kernel.org/stable/c/347867cb424edae5fec1622712c8dd0a2c42918f
• https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb

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