{"id":"DEBIAN-CVE-2024-40957","details":"In the Linux kernel, the following vulnerability has been resolved:  seg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors  input_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for PREROUTING hook, in PREROUTING hook, we should passing a valid indev, and a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer dereference, as below:      [74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090     [74830.655633] #PF: supervisor read access in kernel mode     [74830.657888] #PF: error_code(0x0000) - not-present page     [74830.659500] PGD 0 P4D 0     [74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI     ...     [74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011     [74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]     ...     [74830.689725] Call Trace:     [74830.690402]  \u003cIRQ\u003e     [74830.690953]  ? show_trace_log_lvl+0x1c4/0x2df     [74830.692020]  ? show_trace_log_lvl+0x1c4/0x2df     [74830.693095]  ? ipt_do_table+0x286/0x710 [ip_tables]     [74830.694275]  ? __die_body.cold+0x8/0xd     [74830.695205]  ? page_fault_oops+0xac/0x140     [74830.696244]  ? exc_page_fault+0x62/0x150     [74830.697225]  ? asm_exc_page_fault+0x22/0x30     [74830.698344]  ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]     [74830.699540]  ipt_do_table+0x286/0x710 [ip_tables]     [74830.700758]  ? ip6_route_input+0x19d/0x240     [74830.701752]  nf_hook_slow+0x3f/0xb0     [74830.702678]  input_action_end_dx4+0x19b/0x1e0     [74830.703735]  ? input_action_end_t+0xe0/0xe0     [74830.704734]  seg6_local_input_core+0x2d/0x60     [74830.705782]  lwtunnel_input+0x5b/0xb0     [74830.706690]  __netif_receive_skb_one_core+0x63/0xa0     [74830.707825]  process_backlog+0x99/0x140     [74830.709538]  __napi_poll+0x2c/0x160     [74830.710673]  net_rx_action+0x296/0x350     [74830.711860]  __do_softirq+0xcb/0x2ac     [74830.713049]  do_softirq+0x63/0x90  input_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally trigger a NULL dereference in rpfilter_mt()-\u003erpfilter_is_loopback():      static bool     rpfilter_is_loopback(const struct sk_buff *skb,           \t       const struct net_device *in)     {             // in is NULL             return skb-\u003epkt_type == PACKET_LOOPBACK ||           \t in-\u003eflags & IFF_LOOPBACK;     }","modified":"2026-09-15T09:03:14.274350465Z","published":"2024-07-12T13:15:17.823Z","upstream":["CVE-2024-40957"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-40957"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.99-1"}]}],"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40957.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40957.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-40957.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"}]}