{"api_version":"1","generated_at":"2026-08-22T10:11:23+00:00","cve":"CVE-2023-54243","urls":{"html":"https://cve.report/CVE-2023-54243","api":"https://cve.report/api/cve/CVE-2023-54243.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-54243","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-54243"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2025-12-30 13:16:12","updated_at":"2026-08-04 11:16:38"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5","name":"https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd","name":"https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f","name":"https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249","name":"https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5","name":"https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-54243","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54243","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c58dd2dd443c26d856a168db108a0cd11c285bf3 9060abce3305ab2354c892c09d5689df51486df5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c58dd2dd443c26d856a168db108a0cd11c285bf3 dbb3cbbf03b3c52cb390fabec357f1e4638004f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c58dd2dd443c26d856a168db108a0cd11c285bf3 3dd6ac973351308d4117eda32298a9f1d68764fd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c58dd2dd443c26d856a168db108a0cd11c285bf3 cda0e0243bd3c04008fcd37a46b0269fb3c49249 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c58dd2dd443c26d856a168db108a0cd11c285bf3 e58a171d35e32e6e8c37cfe0e8a94406732a331f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a3bc0f8ea439762aa62d40a295157410498cbea7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8ed40c122919cd79bc3c059e5864e5e7d9d455f0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c5e4ef499cfc78de45a4f01b8c557b5964d77c53 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f34728610b2a8c7b9864f9404f2884c17f6fca5c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.2.60 3.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.4.91 3.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.10.41 3.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.12.21 3.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14.5 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.173 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.100 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.18 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2.5 6.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2023","cve_id":"54243","cve":"CVE-2023-54243","epss":"0.001300000","percentile":"0.030020000","score_date":"2026-08-06","updated_at":"2026-08-07 00:14:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bridge/netfilter/ebtables.c","net/ipv4/netfilter/ip_tables.c","net/ipv6/netfilter/ip6_tables.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9060abce3305ab2354c892c09d5689df51486df5","status":"affected","version":"c58dd2dd443c26d856a168db108a0cd11c285bf3","versionType":"git"},{"lessThan":"dbb3cbbf03b3c52cb390fabec357f1e4638004f5","status":"affected","version":"c58dd2dd443c26d856a168db108a0cd11c285bf3","versionType":"git"},{"lessThan":"3dd6ac973351308d4117eda32298a9f1d68764fd","status":"affected","version":"c58dd2dd443c26d856a168db108a0cd11c285bf3","versionType":"git"},{"lessThan":"cda0e0243bd3c04008fcd37a46b0269fb3c49249","status":"affected","version":"c58dd2dd443c26d856a168db108a0cd11c285bf3","versionType":"git"},{"lessThan":"e58a171d35e32e6e8c37cfe0e8a94406732a331f","status":"affected","version":"c58dd2dd443c26d856a168db108a0cd11c285bf3","versionType":"git"},{"status":"affected","version":"a3bc0f8ea439762aa62d40a295157410498cbea7","versionType":"git"},{"status":"affected","version":"8ed40c122919cd79bc3c059e5864e5e7d9d455f0","versionType":"git"},{"status":"affected","version":"c5e4ef499cfc78de45a4f01b8c557b5964d77c53","versionType":"git"},{"status":"affected","version":"f34728610b2a8c7b9864f9404f2884c17f6fca5c","versionType":"git"},{"status":"affected","version":"8b5740915a9faa8b1fa9166193a33e2a9ae30ec6","versionType":"git"},{"lessThan":"3.3","status":"affected","version":"3.2.60","versionType":"semver"},{"lessThan":"3.5","status":"affected","version":"3.4.91","versionType":"semver"},{"lessThan":"3.11","status":"affected","version":"3.10.41","versionType":"semver"},{"lessThan":"3.13","status":"affected","version":"3.12.21","versionType":"semver"},{"lessThan":"3.15","status":"affected","version":"3.14.5","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bridge/netfilter/ebtables.c","net/ipv4/netfilter/ip_tables.c","net/ipv6/netfilter/ip6_tables.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.15"},{"lessThan":"3.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.173","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.100","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.18","versionType":"semver"},{"lessThanOrEqual":"6.2.*","status":"unaffected","version":"6.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.173","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.100","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.18","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.2.5","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.3","versionStartIncluding":"3.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2.60","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.4.91","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10.41","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12.21","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.14.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:18:42.646Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5"},{"url":"https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5"},{"url":"https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd"},{"url":"https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249"},{"url":"https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f"}],"title":"netfilter: ebtables: fix table blob use-after-free","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2023-54243","datePublished":"2025-12-30T12:11:31.180Z","dateReserved":"2025-12-30T12:06:44.510Z","dateUpdated":"2026-08-04T09:18:42.646Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-30 13:16:12","lastModifiedDate":"2026-08-04 11:16:38","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2023","CveId":"54243","Ordinal":"1","Title":"netfilter: ebtables: fix table blob use-after-free","CVE":"CVE-2023-54243","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"54243","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: ebtables: fix table blob use-after-free"}]}}}