{"id":"CVE-2026-23279","revision":"5e490631989a49889898abc7f70a1794","records":[{"revision":"5e490631989a49889898abc7f70a1794","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23279","aliases":[],"title":"wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame()\n\nIn mesh_rx_csa_frame(), elems->mesh_chansw_params_ie is dereferenced\nat lines 1638 and 1642 without a prior NULL check:\n\n    ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;\n    ...\n    pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);\n\nThe mesh_matches_local() check above only validates the Mesh ID,\nMesh Configuration, and Supported Rates IEs.  It does not verify the\npresence of the Mesh Channel Switch Parameters IE (element ID 118).\nWhen a received CSA action frame omits that IE, ieee802_11_parse_elems()\nleaves elems->mesh_chansw_params_ie as NULL, and the unconditional\ndereference causes a kernel NULL pointer dereference.\n\nA remote mesh peer with an established peer link (PLINK_ESTAB) can\ntrigger this by sending a crafted SPECTRUM_MGMT/CHL_SWITCH action frame\nthat includes a matching Mesh ID and Mesh Configuration IE but omits the\nMesh Channel Switch Parameters IE.  No authentication beyond the default\nopen mesh peering is required.\n\nCrash confirmed on kernel 6.17.0-5-generic via mac80211_hwsim:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  Oops: Oops: 0000 [#1] SMP NOPTI\n  RIP: 0010:ieee80211_mesh_rx_queued_mgmt+0x143/0x2a0 [mac80211]\n  CR2: 0000000000000000\n\nFix by adding a NULL check for mesh_chansw_params_ie after\nmesh_matches_local() returns, consistent with how other optional IEs\nare guarded throughout the mesh code.\n\nThe bug has been present since v3.13 (released 2014-01-19).","state":0,"publishedAt":"2026-03-25T10:26:39.994+00:00","modifiedAt":"2026-10-15T01:13:36.414+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/mac80211/mesh.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"753ad20dcbe36b67088c7770d8fc357d7cc43e08\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"f061336f072ab03fd29270ae61fede46bf8fd69d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"22a9adea7e26d236406edc0ea00b54351dd56b9c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"f5d8af683410a8c82e48b51291915bd612523d9a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"cc6d5a3c0a854aeae00915fc5386570c86029c60\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"be8b82c567fda86f2cbb43b7208825125bb31421\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8f2535b92d685c68db4bc699dd78462a646f6ef9\",\n                            \"lessThan\": \"017c1792525064a723971f0216e6ef86a8c7af11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/mac80211/mesh.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.253\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.203\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.167\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.130\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.77\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.17\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.7\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/753ad20dcbe36b67088c7770d8fc357d7cc43e08","https://git.kernel.org/stable/c/f061336f072ab03fd29270ae61fede46bf8fd69d","https://git.kernel.org/stable/c/2b5f282b1b7241ef624c3399a1cdff0bb1a3eeab","https://git.kernel.org/stable/c/22a9adea7e26d236406edc0ea00b54351dd56b9c","https://git.kernel.org/stable/c/f5d8af683410a8c82e48b51291915bd612523d9a","https://git.kernel.org/stable/c/cc6d5a3c0a854aeae00915fc5386570c86029c60","https://git.kernel.org/stable/c/be8b82c567fda86f2cbb43b7208825125bb31421","https://git.kernel.org/stable/c/017c1792525064a723971f0216e6ef86a8c7af11"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23279","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23279","identifiers":["CVE-2026-23279"]},"retained":false,"historicalAffected":[]}],"coverage":[]}