{"schema_version":"1.7.5","id":"CVE-2026-43027","published":"2026-05-01T14:15:28.521Z","modified":"2026-07-23T18:29:51.228950874Z","related":["ALSA-2026:21556","ALSA-2026:21557","ALSA-2026:21706","ALSA-2026:21745","SUSE-SU-2026:2111-1","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21876-1","SUSE-SU-2026:21877-1","SUSE-SU-2026:21916-1","SUSE-SU-2026:21919-1","SUSE-SU-2026:2195-1","SUSE-SU-2026:2202-1","SUSE-SU-2026:2215-1","SUSE-SU-2026:2216-1","SUSE-SU-2026:2217-1","SUSE-SU-2026:2238-1","SUSE-SU-2026:22598-1","SUSE-SU-2026:22673-1","SUSE-SU-2026:22674-1","SUSE-SU-2026:22675-1","SUSE-SU-2026:22676-1","SUSE-SU-2026:22677-1","SUSE-SU-2026:22678-1","SUSE-SU-2026:22680-1","SUSE-SU-2026:22681-1","SUSE-SU-2026:22682-1","SUSE-SU-2026:22683-1","SUSE-SU-2026:22684-1","SUSE-SU-2026:22685-1","SUSE-SU-2026:22686-1","SUSE-SU-2026:22687-1","SUSE-SU-2026:22689-1","SUSE-SU-2026:22690-1","SUSE-SU-2026:22691-1","SUSE-SU-2026:22692-1","SUSE-SU-2026:22693-1","SUSE-SU-2026:22694-1","SUSE-SU-2026:22695-1","SUSE-SU-2026:22696-1","SUSE-SU-2026:22697-1","SUSE-SU-2026:22711-1","SUSE-SU-2026:22712-1","SUSE-SU-2026:22713-1","SUSE-SU-2026:22714-1","SUSE-SU-2026:22715-1","SUSE-SU-2026:22716-1","SUSE-SU-2026:22717-1","SUSE-SU-2026:22718-1","SUSE-SU-2026:22719-1","SUSE-SU-2026:22720-1","SUSE-SU-2026:22721-1","SUSE-SU-2026:22722-1","SUSE-SU-2026:22723-1","SUSE-SU-2026:22725-1","SUSE-SU-2026:22726-1","SUSE-SU-2026:22728-1","SUSE-SU-2026:22729-1","SUSE-SU-2026:22730-1","SUSE-SU-2026:22731-1","SUSE-SU-2026:22732-1","SUSE-SU-2026:22733-1","SUSE-SU-2026:22734-1","SUSE-SU-2026:22735-1","SUSE-SU-2026:22743-1","SUSE-SU-2026:22744-1","SUSE-SU-2026:22746-1","SUSE-SU-2026:22747-1","SUSE-SU-2026:22748-1","SUSE-SU-2026:22749-1","SUSE-SU-2026:22755-1","SUSE-SU-2026:22758-1","SUSE-SU-2026:22759-1","SUSE-SU-2026:22761-1","SUSE-SU-2026:22762-1","SUSE-SU-2026:22763-1","SUSE-SU-2026:22775-1","SUSE-SU-2026:22776-1","SUSE-SU-2026:22777-1","SUSE-SU-2026:22778-1","SUSE-SU-2026:22780-1","SUSE-SU-2026:22781-1","SUSE-SU-2026:22782-1","SUSE-SU-2026:22783-1","SUSE-SU-2026:22784-1","SUSE-SU-2026:22785-1","SUSE-SU-2026:22786-1","SUSE-SU-2026:2855-1","SUSE-SU-2026:2857-1","SUSE-SU-2026:2858-1","SUSE-SU-2026:2864-1","SUSE-SU-2026:2866-1","SUSE-SU-2026:2867-1","SUSE-SU-2026:2868-1","SUSE-SU-2026:2887-1","SUSE-SU-2026:2888-1","SUSE-SU-2026:2889-1","SUSE-SU-2026:2890-1","SUSE-SU-2026:2894-1","SUSE-SU-2026:2895-1","SUSE-SU-2026:2899-1","SUSE-SU-2026:2902-1","SUSE-SU-2026:2910-1","SUSE-SU-2026:2920-1","SUSE-SU-2026:2930-1","SUSE-SU-2026:2932-1","SUSE-SU-2026:2933-1","SUSE-SU-2026:2937-1","SUSE-SU-2026:2938-1","SUSE-SU-2026:2943-1","SUSE-SU-2026:2945-1","SUSE-SU-2026:2956-1","SUSE-SU-2026:2957-1","SUSE-SU-2026:2961-1","openSUSE-SU-2026:20826-1"],"summary":"netfilter: nf_conntrack_helper: pass helper to expect cleanup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_helper: pass helper to expect cleanup\n\nnf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy()\nto remove expectations belonging to the helper being unregistered.\nHowever, it passes NULL instead of the helper pointer as the data\nargument, so expect_iter_me() never matches any expectation and all\nof them survive the cleanup.\n\nAfter unregister returns, nfnl_cthelper_del() frees the helper\nobject immediately.  Subsequent expectation dumps or packet-driven\ninit_conntrack() calls then dereference the freed exp->helper,\ncausing a use-after-free.\n\nPass the actual helper pointer so expectations referencing it are\nproperly destroyed before the helper object is freed.\n\n  BUG: KASAN: slab-use-after-free in string+0x38f/0x430\n  Read of size 1 at addr ffff888003b14d20 by task poc/103\n  Call Trace:\n   string+0x38f/0x430\n   vsnprintf+0x3cc/0x1170\n   seq_printf+0x17a/0x240\n   exp_seq_show+0x2e5/0x560\n   seq_read_iter+0x419/0x1280\n   proc_reg_read+0x1ac/0x270\n   vfs_read+0x179/0x930\n   ksys_read+0xef/0x1c0\n  Freed by task 103:\n  The buggy address is located 32 bytes inside of\n   freed 192-byte region [ffff888003b14d00, ffff888003b14dc0)","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ac7b848390036dadd4351899d2a23748075916bd"},{"fixed":"5cf28d5c8dcbbe8af6d3b145babe491906d7bad1"},{"fixed":"504ba4168466c91210c45acdc332479cfd5f2da6"},{"fixed":"dc1739eff48e34cc71d4e2f03715493fbcebd8af"},{"fixed":"2cf2737c85a2ba2b52024dafe68ffad2676f97be"},{"fixed":"2c16e4d64dd91227742dfe196a3e7b0568bef65a"},{"fixed":"620f3d14c1ef51d425060a3056ad8dbae8f998a3"},{"fixed":"90bd7e8501349db3006d21fbc09df9ffcb172965"},{"fixed":"a242a9ae58aa46ff7dae51ce64150a93957abe65"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43027.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43027.json"}}],"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2c16e4d64dd91227742dfe196a3e7b0568bef65a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2cf2737c85a2ba2b52024dafe68ffad2676f97be"},{"type":"WEB","url":"https://git.kernel.org/stable/c/504ba4168466c91210c45acdc332479cfd5f2da6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5cf28d5c8dcbbe8af6d3b145babe491906d7bad1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/620f3d14c1ef51d425060a3056ad8dbae8f998a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90bd7e8501349db3006d21fbc09df9ffcb172965"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a242a9ae58aa46ff7dae51ce64150a93957abe65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc1739eff48e34cc71d4e2f03715493fbcebd8af"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43027.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43027"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43027.json"}}