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CVE-2023-54243 (GCVE-0-2023-54243)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-08-05 09:18
VLAI
Title
netfilter: ebtables: fix table blob use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: fix table blob use-after-free We are not allowed to return an error at this point. Looking at the code it looks like ret is always 0 at this point, but its not. t = find_table_lock(net, repl->name, &ret, &ebt_mutex); ... this can return a valid table, with ret != 0. This bug causes update of table->private with the new blob, but then frees the blob right away in the caller. Syzbot report: BUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168 Read of size 4 at addr ffffc90005425000 by task kworker/u4:4/74 Workqueue: netns cleanup_net Call Trace: kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168 ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 ... ip(6)tables appears to be ok (ret should be 0 at this point) but make this more obvious.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < 9060abce3305ab2354c892c09d5689df51486df5 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < dbb3cbbf03b3c52cb390fabec357f1e4638004f5 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < 3dd6ac973351308d4117eda32298a9f1d68764fd (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < cda0e0243bd3c04008fcd37a46b0269fb3c49249 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < e58a171d35e32e6e8c37cfe0e8a94406732a331f (git)
Affected: a3bc0f8ea439762aa62d40a295157410498cbea7 (git)
Affected: 8ed40c122919cd79bc3c059e5864e5e7d9d455f0 (git)
Affected: c5e4ef499cfc78de45a4f01b8c557b5964d77c53 (git)
Affected: f34728610b2a8c7b9864f9404f2884c17f6fca5c (git)
Affected: 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6 (git)
Affected: 3.2.60 , < 3.3 (semver)
Affected: 3.4.91 , < 3.5 (semver)
Affected: 3.10.41 , < 3.11 (semver)
Affected: 3.12.21 , < 3.13 (semver)
Affected: 3.14.5 , < 3.15 (semver)
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Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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          "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-\u003ename, \u0026ret, \u0026ebt_mutex);\n\n... this can return a valid table, with ret != 0.\n\nThis bug causes update of table-\u003eprivate 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."
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        "dateUpdated": "2026-08-05T09:18:22.593Z",
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        "shortName": "Linux"
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnetfilter: ebtables: corregir uso despu\u00e9s de liberaci\u00f3n de blob de tabla\\n\\nNo se nos permite devolver un error en este punto.\\nAl mirar el c\u00f3digo parece que ret siempre es 0 en este\\npunto, pero no lo es.\\n\\nt = find_table_lock(net, repl-\u0026gt;name, \u0026amp;ret, \u0026amp;ebt_mutex);\\n\\n... esto puede devolver una tabla v\u00e1lida, con ret != 0.\\n\\nEste error causa la actualizaci\u00f3n de table-\u0026gt;private con el nuevo\\nblob, pero luego libera el blob inmediatamente en el llamador.\\n\\nInforme de Syzbot:\\n\\nERROR: KASAN: vmalloc-fuera-de-l\u00edmites en __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168\\nLectura de tama\u00f1o 4 en la direcci\u00f3n ffffc90005425000 por la tarea kworker/u4:4/74\\nCola de trabajo: netns cleanup_net\\nTraza de llamada:\\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 parece estar bien (ret deber\u00eda ser 0 en este punto) pero hacer\\nesto m\u00e1s obvio.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\"lessThan\":\"9060abce3305ab2354c892c09d5689df51486df5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\"lessThan\":\"dbb3cbbf03b3c52cb390fabec357f1e4638004f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\"lessThan\":\"3dd6ac973351308d4117eda32298a9f1d68764fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\"lessThan\":\"cda0e0243bd3c04008fcd37a46b0269fb3c49249\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c58dd2dd443c26d856a168db108a0cd11c285bf3\",\"lessThan\":\"e58a171d35e32e6e8c37cfe0e8a94406732a331f\",\"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\",\"status\":\"affected\"},{\"version\":\"3.2.60\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.4.91\",\"lessThan\":\"3.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.10.41\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.12.21\",\"lessThan\":\"3.13\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.14.5\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"3.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.173\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.100\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.18\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.5\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:14:26+00:00",
      "cve": "CVE-2023-54243",
      "id": "CVE-2023-54243",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: ebtables: fix table blob use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54243.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.