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.
Product status
462dbc9101acd38e92eda93c0726857517a24bbd (git) before aa7a22c4d678bf649fd3a1d27debec583563414d
462dbc9101acd38e92eda93c0726857517a24bbd (git) before d841aa5518508ab195b6781ad0d73ee378d713dd
462dbc9101acd38e92eda93c0726857517a24bbd (git) before c6df794000147a3a02f79984aada4ce83f8d0a1e
462dbc9101acd38e92eda93c0726857517a24bbd (git) before 466e10194ab81caa2ee6a332d33ba16bcceeeba6
462dbc9101acd38e92eda93c0726857517a24bbd (git) before fbe48f06e64134dfeafa89ad23387f66ebca3527
462dbc9101acd38e92eda93c0726857517a24bbd (git) before a6d735100f602c830c16d69fb6d780eebd8c9ae1
462dbc9101acd38e92eda93c0726857517a24bbd (git) before c000a3a330d97f6c073ace5aa5faf94b9adb4b79
462dbc9101acd38e92eda93c0726857517a24bbd (git) before 5e28d5a3f774f118896aec17a3a20a9c5c9dfc64
3.8
Any version before 3.8
5.4.297 (semver)
5.10.241 (semver)
5.15.190 (semver)
6.1.147 (semver)
6.6.100 (semver)
6.12.40 (semver)
6.15.8 (semver)
6.16 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
lists.debian.org/debian-lts-announce/2025/10/msg00007.html
cert-portal.siemens.com/productcert/html/ssa-082556.html
git.kernel.org/...c/aa7a22c4d678bf649fd3a1d27debec583563414d
git.kernel.org/...c/d841aa5518508ab195b6781ad0d73ee378d713dd
git.kernel.org/...c/c6df794000147a3a02f79984aada4ce83f8d0a1e
git.kernel.org/...c/466e10194ab81caa2ee6a332d33ba16bcceeeba6
git.kernel.org/...c/fbe48f06e64134dfeafa89ad23387f66ebca3527
git.kernel.org/...c/a6d735100f602c830c16d69fb6d780eebd8c9ae1
git.kernel.org/...c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79
git.kernel.org/...c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64