{
  "cveId": "CVE-2023-54243",
  "url": "https://patchblox.com/security/cve/CVE-2023-54243",
  "summary": "CVE-2023-54243 is fixed in 20 products on 1 platform, first by ALAS2023-2023-138, released March 20, 2023. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  netfilter: ebtables: fix table blob use-after-fr...",
  "description": "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-\u003Ename, \u0026ret, \u0026ebt_mutex);  ... this can return a valid table, with ret != 0.  This bug causes update of table-\u003Eprivate 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\u002B0xc00/0xcd0 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\u002B0xbf/0x1f0 mm/kasan/report.c:517  __ebt_unregister_table\u002B0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168  ebt_unregister_table\u002B0x35/0x40 net/bridge/netfilter/ebtables.c:1372  ops_exit_list\u002B0xb0/0x170 net/core/net_namespace.c:169  cleanup_net\u002B0x4ee/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.",
  "published": "2023-03-20T18:27:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0015,
  "epssPercentile": 0.04178,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-headers",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.1.19-30.43",
      "release": "amzn 2023",
      "fixedVersion": "1.0-0.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-54243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-54243",
      "released": "2025-12-30T13:16:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-54243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-54243",
      "released": "2025-12-30T13:16:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.20-1",
      "fix": "DEBIAN-CVE-2023-54243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-54243",
      "released": "2025-12-30T13:16:12Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.19-30.43.amzn2023",
      "fix": "ALAS2023-2023-138",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-138",
      "released": "2023-03-20T18:27:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}