{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-23396", "tracking": { "current_release_date": "2026-03-28T12:27:58.819962Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-23396", "initial_release_date": "2026-03-26T10:38:38.031771Z", "revision_history": [ { "date": "2026-03-26T10:38:38.031771Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products created (6).| Products connected (8).| References created (6)." }, { "date": "2026-03-26T10:38:42.507569Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-26T11:25:50.140775Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (6)." }, { "date": "2026-03-26T13:06:16.224950Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| Product Identifiers created (1).| References created (6)." }, { "date": "2026-03-26T13:06:17.846277Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-26T15:22:13.053192Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-26T15:22:15.830239Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-26T18:44:07.946306Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-03-26T18:44:12.795717Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-27T06:43:45.120475Z", "number": "10", "summary": "Description created for source." }, { "date": "2026-03-27T06:43:47.238187Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:40:33.299267Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1)." }, { "date": "2026-03-27T19:40:43.392164Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-27T19:40:49.540218Z", "number": "14", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (13).| Product Identifiers created (5).| Product Remediations created (13).| References created (3).| CWES updated (1)." }, { "date": "2026-03-27T19:40:55.196785Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-28T12:19:56.713611Z", "number": "16", "summary": "Product Remediations created (1)." }, { "date": "2026-03-28T12:19:58.612272Z", "number": "17", "summary": "NCSC Score updated." } ], "status": "interim", "version": "17" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<0a4da176ae4b4e075a19c00d3e269cfd5e05a813", "product": { "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<0a4da176ae4b4e075a19c00d3e269cfd5e05a813", "product_id": "CSAFPID-5916208" } }, { "category": "product_version_range", "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<44699c6cdfce80a0f296b54ae9314461e3e41b3d", "product": { "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<44699c6cdfce80a0f296b54ae9314461e3e41b3d", "product_id": "CSAFPID-5916210" } }, { "category": "product_version_range", "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<7c55a3deaf7eaaafa2546f8de7fed19382a0a116", "product": { "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|<7c55a3deaf7eaaafa2546f8de7fed19382a0a116", "product_id": "CSAFPID-5916211" } }, { "category": "product_version_range", "name": "vers:git/2e3c8736820bf72a8ad10721c7e31d36d4fa7790|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 \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 \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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23396.json" }, { "category": "description", "text": "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 \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 \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.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23396" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix NULL deref in mesh_matches_local() mesh_matches_local() unconditionally dereferences ie->mesh_config to compare mesh configuration parameters. When called from mesh_rx_csa_frame(), the parsed action-frame elements may not contain a Mesh Configuration IE, leaving ie->mesh_config NULL and triggering a kernel NULL pointer dereference. The other two callers are already safe: - ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before calling mesh_matches_local() - mesh_plink_get_event() is only reached through mesh_process_plink_frame(), which checks !elems->mesh_config, too mesh_rx_csa_frame() is the only caller that passes raw parsed elements to mesh_matches_local() without guarding mesh_config. An adjacent attacker can exploit this by sending a crafted CSA action frame that includes a valid Mesh ID IE but omits the Mesh Configuration IE, crashing the kernel. The captured crash log: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: events_unbound cfg80211_wiphy_work [...] Call Trace: ? __pfx_mesh_matches_local (net/mac80211/mesh.c:65) ieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686) [...] ieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802) [...] cfg80211_wiphy_work (net/wireless/core.c:426) process_one_work (net/kernel/workqueue.c:3280) ? assign_work (net/kernel/workqueue.c:1219) worker_thread (net/kernel/workqueue.c:3352) ? __pfx_worker_thread (net/kernel/workqueue.c:3385) kthread (net/kernel/kthread.c:436) [...] ret_from_fork_asm (net/arch/x86/entry/entry_64.S:255) This patch adds a NULL check for ie->mesh_config at the top of mesh_matches_local() to return false early when the Mesh Configuration IE is absent.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-23396" }, { "category": "description", "text": "wifi: mac80211: fix NULL deref in mesh\\_matches\\_local()", "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\nwifi: mac80211: fix NULL deref in mesh_matches_local()\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.\nThe other two callers are already safe:\n- ieee80211_mesh_rx_bcn_presp() checks !elems->mesh_config before\ncalling mesh_matches_local()\n- mesh_plink_get_event() is only reached through\nmesh_process_plink_frame(), which checks !elems->mesh_config, too\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.\nThe captured crash log:\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\n? __pfx_mesh_matches_local (net/mac80211/mesh.c:65)\nieee80211_mesh_rx_queued_mgmt (net/mac80211/mesh.c:1686)\n[...]\nieee80211_iface_work (net/mac80211/iface.c:1754 net/mac80211/iface.c:1802)\n[...]\ncfg80211_wiphy_work (net/wireless/core.c:426)\nprocess_one_work (net/kernel/workqueue.c:3280)\n? assign_work (net/kernel/workqueue.c:1219)\nworker_thread (net/kernel/workqueue.c:3352)\n? __pfx_worker_thread (net/kernel/workqueue.c:3385)\nkthread (net/kernel/kthread.c:436)\n[...]\nret_from_fork_asm (net/arch/x86/entry/entry_64.S:255)\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.\nA flaw was found in the Linux kernel's mac80211 component. An adjacent attacker can exploit this by sending a specially crafted Channel Switch Announcement (CSA) action frame. This frame, containing a valid Mesh ID Information Element (IE) but lacking a Mesh Configuration IE, can trigger a NULL pointer dereference within the kernel. Successful exploitation leads to a system crash, resulting in a Denial of Service (DoS).\nThis vulnerability requires the attacker to be on the same wireless mesh network as the target system, limiting exploitation to adjacent network scenarios. Systems not configured for 802.11s mesh networking are not affected. The impact is limited to denial of service through a kernel crash, with no data exposure or code execution.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23396.json" }, { "category": "other", "text": "0.00024", "title": "EPSS" }, { "category": "other", "text": "4.8", "title": "NCSC Score" }, { "category": "other", "text": "VENDOR FIX as product remediation category", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "Is related to a product by vendor Linux, Is related to a product by vendor Debian", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-1372734", "CSAFPID-5916207", "CSAFPID-5916208", "CSAFPID-5916209", "CSAFPID-5916210", "CSAFPID-5916211", "CSAFPID-5916212", "CSAFPID-1330297", "CSAFPID-2036021", "CSAFPID-2036024", "CSAFPID-5761981" ], "known_not_affected": [ "CSAFPID-1372735", "CSAFPID-5904647", "CSAFPID-5904654", "CSAFPID-5904671", "CSAFPID-5905005", "CSAFPID-5905006", "CSAFPID-5905027", "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1453376", "CSAFPID-1453377", "CSAFPID-1453378", "CSAFPID-1453379", "CSAFPID-1453380", "CSAFPID-1453381", "CSAFPID-1453382", "CSAFPID-2858634", "CSAFPID-2858635" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/23xxx/CVE-2026-23396.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-23396" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0879.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-23396" }, { "category": "external", "summary": "Source - microsoft", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-23396.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/c1e3f2416fb27c816ce96d747d3e784e31f4d95c" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/0a4da176ae4b4e075a19c00d3e269cfd5e05a813" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/a90279e7f7ea0b7e923a1c5ebee9a6b78b6d1004" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/44699c6cdfce80a0f296b54ae9314461e3e41b3d" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/7c55a3deaf7eaaafa2546f8de7fed19382a0a116" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://git.kernel.org/stable/c/c73bb9a2d33bf81f6eecaa0f474b6c6dbe9855bd" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0879.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0879" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032631-CVE-2026-23396-6447@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032634-CVE-2026-23397-d4f0@gregkh/" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://lore.kernel.org/linux-cve-announce/2026032634-CVE-2026-23398-df1e@gregkh/" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-23396" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23396" }, { "category": "external", "summary": "Reference - redhat", "url": "https://lore.kernel.org/linux-cve-announce/2026032631-CVE-2026-23396-6447@gregkh/T" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this issue, prevent the mac80211 module from being loaded. See https://access.redhat.com/solutions/41278 for instructions. Note that this will disable WiFi functionality entirely.", "product_ids": [ "CSAFPID-1439315", "CSAFPID-1439317", "CSAFPID-1439319", "CSAFPID-1439321", "CSAFPID-1453376", "CSAFPID-1453377", "CSAFPID-1453378", "CSAFPID-1453379", "CSAFPID-1453380", "CSAFPID-1453381", "CSAFPID-1453382", "CSAFPID-2858634", "CSAFPID-2858635" ] }, { "category": "vendor_fix", "details": "CBL-Mariner Releases", "product_ids": [ "CSAFPID-5761981" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1330297", "CSAFPID-1372734", "CSAFPID-2036021", "CSAFPID-2036024", "CSAFPID-5761981", "CSAFPID-5916207", "CSAFPID-5916208", "CSAFPID-5916209", "CSAFPID-5916210", "CSAFPID-5916211", "CSAFPID-5916212" ] } ], "title": "CVE-2026-23396" } ] }