CVE-2025-38083
net_sched: prio: fix a race in prio_tune()
MEDIUM 4.7EPSS 0.2%
In the Linux kernel, the following vulnerability has been resolved:net_sched: prio: fix a race in prio_tune()Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timerfires 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 qdiscbefore releasing the lock.
- Affected
- Linux
- CVSS v3.1 NVD
- 4.7 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS v3.1 CNA
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.15% chance of exploitation in the next 30 days, 4th percentile
- Published
- 2025-06-20
- Updated
- 2026-10-15
Exploit collections (1)
- linux/kernelctf/CVE-2025-38083_cos_mitigationgoogle/security-research
Security advisories
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://git.kernel.org/stable/c/20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f
- https://git.kernel.org/stable/c/3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4
- https://git.kernel.org/stable/c/4483d8b9127591c60c4eb789d6cab953bc4522a9
- https://git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f
- https://git.kernel.org/stable/c/53d11560e957d53ee87a0653d258038ce12361b7
- https://git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845
- https://git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3
- https://git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584