{"id":"CVE-2026-23396","state":"PUBLISHED","title":"wifi: mac80211: fix NULL deref in mesh_matches_local()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix NULL deref in mesh_matches_local()\n\nmesh_matches_local() unconditionally dereferences ie->mesh_config to\ncompare mesh configuration parameters. When called from\nmesh_rx_csa_frame(), the parsed action-frame elements may not contain a\nMesh Configuration IE, leaving ie->mesh_config NULL and triggering a\nkernel NULL pointer dereference.\n\nThe other two callers are already safe:\n  - ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before\n    calling mesh_matches_local()\n  - mesh_plink_get_event() is only reached through\n    mesh_process_plink_frame(), which checks !elems->mesh_config, too\n\nmesh_rx_csa_frame() is the only caller that passes raw parsed elements\nto mesh_matches_local() without guarding mesh_config. An adjacent\nattacker can exploit this by sending a crafted CSA action frame that\nincludes a valid Mesh ID IE but omits the Mesh Configuration IE,\ncrashing the kernel.\n\nThe captured crash log:\n\nOops: general protection fault, probably for non-canonical address ...\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nWorkqueue: events_unbound cfg80211_wiphy_work\n[...]\nCall Trace:\n <TASK>\n ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65)\n ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686)\n [...]\n ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802)\n [...]\n cfg80211_wiphy_work (net/wireless/core.c:426)\n process_one_work (net/kernel/workqueue.c:3280)\n ? assign_work (net/kernel/workqueue.c:1219)\n worker_thread (net/kernel/workqueue.c:3352)\n ? __pfx_worker_thread (net/kernel/workqueue.c:3385)\n kthread (net/kernel/kthread.c:436)\n [...]\n ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255)\n </TASK>\n\nThis patch adds a NULL check for ie->mesh_config at the top of\nmesh_matches_local() to return false early when the Mesh Configuration\nIE is absent.","publishedAt":"2026-03-26T10:22:49.287Z","updatedAt":"2026-10-15T01:14:46.530Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"14a4fd13657a3f2489db6566f081adfb27a49c64","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"74de6fa472b03bc8cde0a081484e9960bcbda568","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"c1e3f2416fb27c816ce96d747d3e784e31f4d95c","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"0a4da176ae4b4e075a19c00d3e269cfd5e05a813","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"44699c6cdfce80a0f296b54ae9314461e3e41b3d","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"7c55a3deaf7eaaafa2546f8de7fed19382a0a116","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"]}],"references":["https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64","https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568","https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c","https://git.kernel.org/stable/c/0a4da176ae4b4e075a19c00d3e269cfd5e05a813","https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004","https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d","https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116","https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23396.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23396","state":"PUBLISHED","datePublished":"2026-03-26T10:22:49.287Z","dateUpdated":"2026-10-15T01:14:46.530Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:46.011Z"},"containers":{"cna":{"title":"wifi: mac80211: fix NULL deref in mesh_matches_local()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix NULL deref in mesh_matches_local()\n\nmesh_matches_local() unconditionally dereferences ie->mesh_config to\ncompare mesh configuration parameters. When called from\nmesh_rx_csa_frame(), the parsed action-frame elements may not contain a\nMesh Configuration IE, leaving ie->mesh_config NULL and triggering a\nkernel NULL pointer dereference.\n\nThe other two callers are already safe:\n  - ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before\n    calling mesh_matches_local()\n  - mesh_plink_get_event() is only reached through\n    mesh_process_plink_frame(), which checks !elems->mesh_config, too\n\nmesh_rx_csa_frame() is the only caller that passes raw parsed elements\nto mesh_matches_local() without guarding mesh_config. An adjacent\nattacker can exploit this by sending a crafted CSA action frame that\nincludes a valid Mesh ID IE but omits the Mesh Configuration IE,\ncrashing the kernel.\n\nThe captured crash log:\n\nOops: general protection fault, probably for non-canonical address ...\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nWorkqueue: events_unbound cfg80211_wiphy_work\n[...]\nCall Trace:\n <TASK>\n ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65)\n ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686)\n [...]\n ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802)\n [...]\n cfg80211_wiphy_work (net/wireless/core.c:426)\n process_one_work (net/kernel/workqueue.c:3280)\n ? assign_work (net/kernel/workqueue.c:1219)\n worker_thread (net/kernel/workqueue.c:3352)\n ? __pfx_worker_thread (net/kernel/workqueue.c:3385)\n kthread (net/kernel/kthread.c:436)\n [...]\n ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255)\n </TASK>\n\nThis patch adds a NULL check for ie->mesh_config at the top of\nmesh_matches_local() to return false early when the Mesh Configuration\nIE is absent."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"14a4fd13657a3f2489db6566f081adfb27a49c64","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"74de6fa472b03bc8cde0a081484e9960bcbda568","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"c1e3f2416fb27c816ce96d747d3e784e31f4d95c","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"0a4da176ae4b4e075a19c00d3e269cfd5e05a813","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"44699c6cdfce80a0f296b54ae9314461e3e41b3d","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"7c55a3deaf7eaaafa2546f8de7fed19382a0a116","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","status":"affected","lessThan":"c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.26","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/14a4fd13657a3f2489db6566f081adfb27a49c64"},{"url":"https://git.kernel.org/stable/c/74de6fa472b03bc8cde0a081484e9960bcbda568"},{"url":"https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c"},{"url":"https://git.kernel.org/stable/c/0a4da176ae4b4e075a19c00d3e269cfd5e05a813"},{"url":"https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004"},{"url":"https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d"},{"url":"https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116"},{"url":"https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:06:05.924Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.26","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:14:46.530Z"},"x_adpType":"supplier"}]}}}