{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23396","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:46.011Z","datePublished":"2026-03-26T10:22:49.287Z","dateUpdated":"2026-05-11T22:06:05.924Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:06:05.924Z"},"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":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"],"versions":[{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"14a4fd13657a3f2489db6566f081adfb27a49c64","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"74de6fa472b03bc8cde0a081484e9960bcbda568","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"c1e3f2416fb27c816ce96d747d3e784e31f4d95c","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"0a4da176ae4b4e075a19c00d3e269cfd5e05a813","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"44699c6cdfce80a0f296b54ae9314461e3e41b3d","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"7c55a3deaf7eaaafa2546f8de7fed19382a0a116","status":"affected","versionType":"git"},{"version":"2e3c8736820bf72a8ad10721c7e31d36d4fa7790","lessThan":"c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/mesh.c"],"versions":[{"version":"2.6.26","status":"affected"},{"version":"0","lessThan":"2.6.26","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.20","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.10","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"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"}]}]}],"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"}],"title":"wifi: mac80211: fix NULL deref in mesh_matches_local()","x_generator":{"engine":"bippy-1.2.0"}}}}