{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2024-40957 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2024-40957 is a high-severity vulnerability in Linux kernel, published on 12 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2024-40957 and fix it if it is affected.\n\nWhat it is: CVE-2024-40957 is a high-severity vulnerability in Linux kernel, published on 12 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2024-40957 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2024-40957/ (Markdown: https://insights.sbomify.com/CVE-2024-40957/index.md)","id":"CVE-2024-40957","markdown":"https://insights.sbomify.com/CVE-2024-40957/index.md","name":"CVE-2024-40957","record":{"aliases":["BELL-CVE-2024-40957","DEBIAN-CVE-2024-40957","GHSA-968h-6229-65gg","UBUNTU-CVE-2024-40957"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"A null pointer dereference in the Linux kernel's Segment Routing 6 implementation can cause a system crash when processing specific network packets.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors\n\ninput_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for\nPREROUTING hook, in PREROUTING hook, we should passing a valid indev,\nand a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer\ndereference, as below:\n\n    [74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090\n    [74830.655633] #PF: supervisor read access in kernel mode\n    [74830.657888] #PF: error_code(0x0000) - not-present page\n    [74830.659500] PGD 0 P4D 0\n    [74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI\n    ...\n    [74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\n    [74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n    ...\n    [74830.689725] Call Trace:\n    [74830.690402]  \u003cIRQ\u003e\n    [74830.690953]  ? show_trace_log_lvl+0x1c4/0x2df\n    [74830.692020]  ? show_trace_log_lvl+0x1c4/0x2df\n    [74830.693095]  ? ipt_do_table+0x286/0x710 [ip_tables]\n    [74830.694275]  ? __die_body.cold+0x8/0xd\n    [74830.695205]  ? page_fault_oops+0xac/0x140\n    [74830.696244]  ? exc_page_fault+0x62/0x150\n    [74830.697225]  ? asm_exc_page_fault+0x22/0x30\n    [74830.698344]  ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n    [74830.699540]  ipt_do_table+0x286/0x710 [ip_tables]\n    [74830.700758]  ? ip6_route_input+0x19d/0x240\n    [74830.701752]  nf_hook_slow+0x3f/0xb0\n    [74830.702678]  input_action_end_dx4+0x19b/0x1e0\n    [74830.703735]  ? input_action_end_t+0xe0/0xe0\n    [74830.704734]  seg6_local_input_core+0x2d/0x60\n    [74830.705782]  lwtunnel_input+0x5b/0xb0\n    [74830.706690]  __netif_receive_skb_one_core+0x63/0xa0\n    [74830.707825]  process_backlog+0x99/0x140\n    [74830.709538]  __napi_poll+0x2c/0x160\n    [74830.710673]  net_rx_action+0x296/0x350\n    [74830.711860]  __do_softirq+0xcb/0x2ac\n    [74830.713049]  do_softirq+0x63/0x90\n\ninput_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally\ntrigger a NULL dereference in rpfilter_mt()-\u003erpfilter_is_loopback():\n\n    static bool\n    rpfilter_is_loopback(const struct sk_buff *skb,\n          \t       const struct net_device *in)\n    {\n            // in is NULL\n            return skb-\u003epkt_type == PACKET_LOOPBACK ||\n          \t in-\u003eflags \u0026 IFF_LOOPBACK;\n    }","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"seg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors","id":"CVE-2024-40957","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2024"},"n_packages":0,"n_references":5,"next":{"headline":"netns: Make get_net_ns() handle zero refcount net","id":"CVE-2024-40958"},"packages":[],"prev":{"headline":"dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list","id":"CVE-2024-40956"},"products":["Linux"],"published":"2024-07-12","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A null pointer dereference in the Linux kernel's Segment Routing 6 implementation can cause a system crash when processing specific network packets.","url":"https://insights.sbomify.com/CVE-2024-40957/"}