{"id":"CVE-2026-64452","revision":"eb27098fb3bc4c639647bfc7a3cee8c3","records":[{"revision":"eb27098fb3bc4c639647bfc7a3cee8c3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64452","aliases":[],"title":"6lowpan: fix NHC entry use-after-free on error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix NHC entry use-after-free on error path\n\nlowpan_nhc_do_uncompression() looks up an NHC descriptor while holding\nlowpan_nhc_lock.  If the descriptor has no uncompress callback, the error\npath drops the lock before printing nhc->name.\n\nlowpan_nhc_del() removes descriptors under the same lock and then relies\non synchronize_net() before the owning module can be unloaded.  That only\nwaits for net RX RCU readers.  lowpan_header_decompress() is also exported\nand can be reached from callers that are not necessarily covered by the net\ncore RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive\npath.\n\nThis leaves a race where one task drops lowpan_nhc_lock in the error path,\nanother task unregisters and frees the matching descriptor after\nsynchronize_net() returns, and the first task then dereferences nhc->name\nfor the warning.\n\nWith the post-unlock window widened, KASAN reports:\n\n  BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220\n  Read of size 8\n  lowpan_nhc_do_uncompression\n  lowpan_header_decompress\n\nFix this by printing the warning before dropping lowpan_nhc_lock, so the\ndescriptor name is read while unregister is still excluded.  The malformed\npacket is still rejected with -ENOTSUPP.","state":0,"publishedAt":"2026-07-25T08:51:21.754+00:00","modifiedAt":"2026-10-19T20:38:30.45+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/6lowpan/nhc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"9c2f5c0829a8c8b904dae36be6d8056b719ac605\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"80b5c8779acee0550845394fb3e5176a398aa24c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"cc27aea4d454abfb385ee2c9499c78b96db9b728\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"a8e3a94711134e898c6021a6b77374efa91b3639\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"0beccbcf50de125be5520d0ffc59af4bb8655482\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"b713aa0cc344f10f7a9928a230b5f5e780d04078\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92aa7c65d295f3cbb96904afe335f683e55584b8\",\n                            \"lessThan\": \"1720db928e5a58ca7d75ac1d514c3b73fd7061a7\",\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/6lowpan/nhc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.96\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.39\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.4\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605","https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c","https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728","https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639","https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168","https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482","https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078","https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64452","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64452","identifiers":["CVE-2026-64452"]},"retained":false,"historicalAffected":[]}],"coverage":[]}