CVE-2025-38477
net/sched: sch_qfq: Fix race condition on qfq_aggregate
MEDIUM 4.7EPSS 0.1%
In the Linux kernel, the following vulnerability has been resolved:net/sched: sch_qfq: Fix race condition on qfq_aggregateA race condition can occur when 'agg' is modified in qfq_change_agg(called during qfq_enqueue) while other threads access itconcurrently. For example, qfq_dump_class may trigger a NULLdereference, and qfq_delete_class may cause a use-after-free.This patch addresses the issue by:1. Moved qfq_destroy_class into the critical section.2. Added sch_tree_lock protection to qfq_dump_class andqfq_dump_class_stats.
- 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
- 0.13% chance of exploitation in the next 30 days, 2nd percentile
- Published
- 2025-07-28
- Updated
- 2026-10-15
Exploit collections (1)
- linux/kernelctf/CVE-2025-38477_cosgoogle/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/466e10194ab81caa2ee6a332d33ba16bcceeeba6
- https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64
- https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1
- https://git.kernel.org/stable/c/aa7a22c4d678bf649fd3a1d27debec583563414d
- https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79
- https://git.kernel.org/stable/c/c6df794000147a3a02f79984aada4ce83f8d0a1e
- https://git.kernel.org/stable/c/d841aa5518508ab195b6781ad0d73ee378d713dd
- https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527