FKIE_CVE-2023-54243

Vulnerability from fkie_nvd - Published: 2025-12-30 13:16 - Updated: 2026-06-17 06:47
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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-\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."
    },
    {
      "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."
    }
  ],
  "id": "CVE-2023-54243",
  "lastModified": "2026-06-17T06:47:04.840",
  "metrics": {},
  "published": "2025-12-30T13:16:12.880",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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