{"id":"DEBIAN-CVE-2022-48976","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:    \u003cTASK\u003e    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().","modified":"2026-08-27T23:04:45.857493251Z","published":"2024-10-21T20:15:09.680Z","upstream":["CVE-2022-48976"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48976"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48976.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48976.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48976.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}