{"id":"DEBIAN-CVE-2024-41040","details":"In the Linux kernel, the following vulnerability has been resolved:  net/sched: Fix UAF when resolving a clash  KASAN reports the following UAF:   BUG: KASAN: slab-use-after-free in tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct]  Read of size 1 at addr ffff888c07603600 by task handler130/6469   Call Trace:   \u003cIRQ\u003e   dump_stack_lvl+0x48/0x70   print_address_description.constprop.0+0x33/0x3d0   print_report+0xc0/0x2b0   kasan_report+0xd0/0x120   __asan_load1+0x6c/0x80   tcf_ct_flow_table_process_conn+0x12b/0x380 [act_ct]   tcf_ct_act+0x886/0x1350 [act_ct]   tcf_action_exec+0xf8/0x1f0   fl_classify+0x355/0x360 [cls_flower]   __tcf_classify+0x1fd/0x330   tcf_classify+0x21c/0x3c0   sch_handle_ingress.constprop.0+0x2c5/0x500   __netif_receive_skb_core.constprop.0+0xb25/0x1510   __netif_receive_skb_list_core+0x220/0x4c0   netif_receive_skb_list_internal+0x446/0x620   napi_complete_done+0x157/0x3d0   gro_cell_poll+0xcf/0x100   __napi_poll+0x65/0x310   net_rx_action+0x30c/0x5c0   __do_softirq+0x14f/0x491   __irq_exit_rcu+0x82/0xc0   irq_exit_rcu+0xe/0x20   common_interrupt+0xa1/0xb0   \u003c/IRQ\u003e   \u003cTASK\u003e   asm_common_interrupt+0x27/0x40   Allocated by task 6469:   kasan_save_stack+0x38/0x70   kasan_set_track+0x25/0x40   kasan_save_alloc_info+0x1e/0x40   __kasan_krealloc+0x133/0x190   krealloc+0xaa/0x130   nf_ct_ext_add+0xed/0x230 [nf_conntrack]   tcf_ct_act+0x1095/0x1350 [act_ct]   tcf_action_exec+0xf8/0x1f0   fl_classify+0x355/0x360 [cls_flower]   __tcf_classify+0x1fd/0x330   tcf_classify+0x21c/0x3c0   sch_handle_ingress.constprop.0+0x2c5/0x500   __netif_receive_skb_core.constprop.0+0xb25/0x1510   __netif_receive_skb_list_core+0x220/0x4c0   netif_receive_skb_list_internal+0x446/0x620   napi_complete_done+0x157/0x3d0   gro_cell_poll+0xcf/0x100   __napi_poll+0x65/0x310   net_rx_action+0x30c/0x5c0   __do_softirq+0x14f/0x491   Freed by task 6469:   kasan_save_stack+0x38/0x70   kasan_set_track+0x25/0x40   kasan_save_free_info+0x2b/0x60   ____kasan_slab_free+0x180/0x1f0   __kasan_slab_free+0x12/0x30   slab_free_freelist_hook+0xd2/0x1a0   __kmem_cache_free+0x1a2/0x2f0   kfree+0x78/0x120   nf_conntrack_free+0x74/0x130 [nf_conntrack]   nf_ct_destroy+0xb2/0x140 [nf_conntrack]   __nf_ct_resolve_clash+0x529/0x5d0 [nf_conntrack]   nf_ct_resolve_clash+0xf6/0x490 [nf_conntrack]   __nf_conntrack_confirm+0x2c6/0x770 [nf_conntrack]   tcf_ct_act+0x12ad/0x1350 [act_ct]   tcf_action_exec+0xf8/0x1f0   fl_classify+0x355/0x360 [cls_flower]   __tcf_classify+0x1fd/0x330   tcf_classify+0x21c/0x3c0   sch_handle_ingress.constprop.0+0x2c5/0x500   __netif_receive_skb_core.constprop.0+0xb25/0x1510   __netif_receive_skb_list_core+0x220/0x4c0   netif_receive_skb_list_internal+0x446/0x620   napi_complete_done+0x157/0x3d0   gro_cell_poll+0xcf/0x100   __napi_poll+0x65/0x310   net_rx_action+0x30c/0x5c0   __do_softirq+0x14f/0x491  The ct may be dropped if a clash has been resolved but is still passed to the tcf_ct_flow_table_process_conn function for further usage. This issue can be fixed by retrieving ct from skb again after confirming conntrack.","modified":"2026-09-15T09:03:09.617515627Z","published":"2024-07-29T15:15:12.473Z","upstream":["CVE-2024-41040"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-41040"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.106-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-41040.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-41040.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-41040.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}