{"id":"CVE-2023-54243","revision":"eabdafd72f844fec82f6d43b2ae5f903","records":[{"revision":"eabdafd72f844fec82f6d43b2ae5f903","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-54243","aliases":[],"title":"netfilter: ebtables: fix table blob use-after-free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: fix table blob use-after-free\n\nWe are not allowed to return an error at this point.\nLooking at the code it looks like ret is always 0 at this\npoint, but its not.\n\nt = find_table_lock(net, repl->name, &ret, &ebt_mutex);\n\n... this can return a valid table, with ret != 0.\n\nThis bug causes update of table->private with the new\nblob, but then frees the blob right away in the caller.\n\nSyzbot report:\n\nBUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168\nRead of size 4 at addr ffffc90005425000 by task kworker/u4:4/74\nWorkqueue: netns cleanup_net\nCall Trace:\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:517\n __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168\n ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372\n ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169\n cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613\n...\n\nip(6)tables appears to be ok (ret should be 0 at this point) but make\nthis more obvious.","state":0,"publishedAt":"2025-12-30T12:11:31.18+00:00","modifiedAt":"2026-10-15T21:41:43.012+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/bridge/netfilter/ebtables.c\",\n                        \"net/ipv4/netfilter/ip_tables.c\",\n                        \"net/ipv6/netfilter/ip6_tables.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\n                            \"lessThan\": \"9060abce3305ab2354c892c09d5689df51486df5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\n                            \"lessThan\": \"dbb3cbbf03b3c52cb390fabec357f1e4638004f5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\n                            \"lessThan\": \"3dd6ac973351308d4117eda32298a9f1d68764fd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\n                            \"lessThan\": \"cda0e0243bd3c04008fcd37a46b0269fb3c49249\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\n                            \"lessThan\": \"e58a171d35e32e6e8c37cfe0e8a94406732a331f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a3bc0f8ea439762aa62d40a295157410498cbea7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8ed40c122919cd79bc3c059e5864e5e7d9d455f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c5e4ef499cfc78de45a4f01b8c557b5964d77c53\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f34728610b2a8c7b9864f9404f2884c17f6fca5c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b5740915a9faa8b1fa9166193a33e2a9ae30ec6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.2.60\",\n                            \"lessThan\": \"3.3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.4.91\",\n                            \"lessThan\": \"3.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.10.41\",\n                            \"lessThan\": \"3.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.12.21\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.14.5\",\n                            \"lessThan\": \"3.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/bridge/netfilter/ebtables.c\",\n                        \"net/ipv4/netfilter/ip_tables.c\",\n                        \"net/ipv6/netfilter/ip6_tables.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.173\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.100\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.18\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.2.5\",\n                            \"lessThanOrEqual\": \"6.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5","https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5","https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd","https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249","https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54243","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-54243","identifiers":["CVE-2023-54243"]},"retained":false,"historicalAffected":[]}],"coverage":[]}