{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-43037 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-43037 is a critical memory corruption vulnerability in Linux kernel, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-43037 and fix it if it is affected.\n\nWhat it is: CVE-2026-43037 is a critical memory corruption vulnerability in Linux kernel, published on 1 May 2026. 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-2026-43037 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-2026-43037/ (Markdown: https://insights.sbomify.com/CVE-2026-43037/index.md)","id":"CVE-2026-43037","markdown":"https://insights.sbomify.com/CVE-2026-43037/index.md","name":"CVE-2026-43037","record":{"aliases":["BELL-CVE-2026-43037","DEBIAN-CVE-2026-43037","GHSA-p2wf-qj6m-x5fg","RHSA-2026:25534","RHSA-2026:28738","RHSA-2026:28740","RHSA-2026:28741","RHSA-2026:28742","RHSA-2026:28748","RHSA-2026:28749","RHSA-2026:28750","ROOT-OS-DEBIAN-11-CVE-2026-43037","ROOT-OS-UBUNTU-2204-CVE-2026-43037","ROOT-OS-UBUNTU-2404-CVE-2026-43037","UBUNTU-CVE-2026-43037"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"A memory corruption vulnerability in the Linux kernel's IPv6 tunnel error handling allows attackers to execute arbitrary code or cause a denial of service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-843","name":"Access of Resource Using Incompatible Type"},{"id":"CWE-121","name":"Stack-based Buffer Overflow"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()\n\nOskar Kjos reported the following problem.\n\nip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written\nby the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes\nIPCB(skb2) to __ip_options_echo(), which interprets that cb[] region\nas struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff\nat offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr\nvalue. __ip_options_echo() then reads optlen from attacker-controlled\npacket data at sptr[rr+1] and copies that many bytes into dopt-\u003e__data,\na fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).\n\nTo fix this we clear skb2-\u003ecb[], as suggested by Oskar Kjos.\n\nAlso add minimal IPv4 header validation (version == 4, ihl \u003e= 5).","ecosystems":["Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:9::baseos","Red Hat:enterprise_linux_nvidia:10::el10","Red Hat:rhel_e4s:8.8::baseos","Red Hat:rhel_e4s:9.2::baseos","Red Hat:rhel_e4s:9.4::baseos","Red Hat:rhel_eus:9.6::baseos"],"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":"ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()","id":"CVE-2026-43037","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"memory_corruption","year":"2026"},"n_packages":125,"n_references":8,"next":{"headline":"ipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach()","id":"CVE-2026-43038"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1","source":"RHSA-2026:28742"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1-debuginfo","source":"RHSA-2026:28742"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-1.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1-debugsource","source":"RHSA-2026:28742"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_109_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_109_1","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_109_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_109_1-debuginfo","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-4.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_109_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_109_1-debugsource","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_125_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_125_1","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_125_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_125_1-debuginfo","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-1.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_125_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_125_1-debugsource","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-11.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_53_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_53_1","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-11.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_53_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_53_1-debuginfo","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-11.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_53_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_53_1-debugsource","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_72_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_72_1","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_72_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_72_1-debuginfo","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_72_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_72_1-debugsource","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-6.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_85_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_85_1","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-6.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_85_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_85_1-debuginfo","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-6.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_85_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_85_1-debugsource","source":"RHSA-2026:28749"},{"ecosystem":"Red Hat:enterprise_linux:9::baseos","fixed":["0:1-1.el9_8"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-5_14_0-687_10_1","purl":"pkg:rpm/redhat/kpatch-patch-5_14_0-687_10_1","source":"RHSA-2026:28741"},{"ecosystem":"Red Hat:enterprise_linux:9::baseos","fixed":["0:1-1.el9_8"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-5_14_0-687_10_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-5_14_0-687_10_1-debuginfo","source":"RHSA-2026:28741"},{"ecosystem":"Red Hat:enterprise_linux:9::baseos","fixed":["0:1-1.el9_8"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-5_14_0-687_10_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-5_14_0-687_10_1-debugsource","source":"RHSA-2026:28741"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k","purl":"pkg:rpm/redhat/kernel-64k","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-core","purl":"pkg:rpm/redhat/kernel-64k-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug","purl":"pkg:rpm/redhat/kernel-64k-debug","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug-core","purl":"pkg:rpm/redhat/kernel-64k-debug-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-64k-debug-debuginfo","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug-modules","purl":"pkg:rpm/redhat/kernel-64k-debug-modules","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug-modules-core","purl":"pkg:rpm/redhat/kernel-64k-debug-modules-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debug-modules-extra","purl":"pkg:rpm/redhat/kernel-64k-debug-modules-extra","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-debuginfo","purl":"pkg:rpm/redhat/kernel-64k-debuginfo","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-modules","purl":"pkg:rpm/redhat/kernel-64k-modules","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-modules-core","purl":"pkg:rpm/redhat/kernel-64k-modules-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-64k-modules-extra","purl":"pkg:rpm/redhat/kernel-64k-modules-extra","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2026:25534"},{"ecosystem":"Red Hat:enterprise_linux_nvidia:10::el10","fixed":["0:6.12.0-212.10.el10nv"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2026:25534"}],"prev":{"headline":"net: use skb_header_pointer() for TCPv4 GSO frag_off check","id":"CVE-2026-43036"},"products":["Linux"],"published":"2026-05-01","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":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A memory corruption vulnerability in the Linux kernel's IPv6 tunnel error handling allows attackers to execute arbitrary code or cause a denial of service.","url":"https://insights.sbomify.com/CVE-2026-43037/"}