CVE-2022-48976
- Source
- https://cve.org/CVERecord?id=CVE-2022-48976
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48976.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-48976
- Downstream
- Published
- 2024-10-21T20:05:55Z
- Modified
- 2026-10-20T11:01:52Z
- Summary
- netfilter: flowtable_offload: fix using __this_cpu_add in preemptible
- Details
-
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: 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().
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48976.json" }- References
-
- https://git.kernel.org/stable/c/a220a11fda012fba506b35929672374c2723ae6d
- https://git.kernel.org/stable/c/a81047154e7ce4eb8769d5d21adcbc9693542a79
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48976.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-48976
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedb038177636f83bbf87c2b238706474145dd2cd04Fixeda220a11fda012fba506b35929672374c2723ae6dFixeda81047154e7ce4eb8769d5d21adcbc9693542a79
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.15.157Fixed5.16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5345d78ae64d5a760c211cd2da995dc71c5b29e4