Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_qfq: Fix race condition on qfq_aggregate
A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, 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 and qfq_dump_class_stats.
Metrics
CVSS 3.1 4.7/10
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 462dbc9101acd38e92eda93c0726857517a24bbd, < aa7a22c4d678bf649fd3a1d27debec583563414d; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < d841aa5518508ab195b6781ad0d73ee378d713dd; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < c6df794000147a3a02f79984aada4ce83f8d0a1e; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 466e10194ab81caa2ee6a332d33ba16bcceeeba6; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < fbe48f06e64134dfeafa89ad23387f66ebca3527; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < a6d735100f602c830c16d69fb6d780eebd8c9ae1; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < c000a3a330d97f6c073ace5aa5faf94b9adb4b79; >= 462dbc9101acd38e92eda93c0726857517a24bbd, < 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64 |
| Linux | Linux | 3.8 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
References
- https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6Patch
- https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64Patch
- https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1Patch
- https://git.kernel.org/stable/c/aa7a22c4d678bf649fd3a1d27debec583563414dPatch
- https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79Patch
- https://git.kernel.org/stable/c/c6df794000147a3a02f79984aada4ce83f8d0a1ePatch
- https://git.kernel.org/stable/c/d841aa5518508ab195b6781ad0d73ee378d713ddPatch
- https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Timeline
- Published
- Jul 28, 2025
- Last modified
- Jul 30, 2026
- NVD status
- Modified