Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable_offload: fix using __this_cpu_add in preemptible flow_offload_queue_work() can be called in workqueue without bh disabled, like the call trace showed in my act_ct testing, calling NF_FLOW_TABLE_STAT_INC() there would cause a call trace: BUG: using __this_cpu_add() in preemptible [00000000] code: kworker/u4:0/138560 caller is flow_offload_queue_work+0xec/0x1b0 [nf_flow_table] Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work [act_ct] Call Trace: <TASK> dump_stack_lvl+0x33/0x46 check_preemption_disabled+0xc3/0xf0 flow_offload_queue_work+0xec/0x1b0 [nf_flow_table] nf_flow_table_iterate+0x138/0x170 [nf_flow_table] nf_flow_table_free+0x140/0x1a0 [nf_flow_table] tcf_ct_flow_table_cleanup_work+0x2f/0x2b0 [act_ct] process_one_work+0x6a3/0x1030 worker_thread+0x8a/0xdf0 This patch fixes it by using NF_FLOW_TABLE_STAT_INC_ATOMIC() instead in flow_offload_queue_work(). Note that for FLOW_CLS_REPLACE branch in flow_offload_queue_work(), it may not be called in preemptible path, but it's good to use NF_FLOW_TABLE_STAT_INC_ATOMIC() for all cases in flow_offload_queue_work().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b038177636f83bbf87c2b238706474145dd2cd04 before a220a11fda012fba506b35929672374c2723ae6d; affected b038177636f83bbf87c2b238706474145dd2cd04 before a81047154e7ce4eb8769d5d21adcbc9693542a79; affected 5345d78ae64d5a760c211cd2da995dc71c5b29e4; affected 5.15.157 before 5.16 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.0.13 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a220a11fda012fba506b35929672374c2723ae6d
- https://git.kernel.org/stable/c/a81047154e7ce4eb8769d5d21adcbc9693542a79
ADP enrichment
No English description supplied.
No references supplied.