{
  "cveId": "CVE-2023-53186",
  "url": "https://patchblox.com/security/cve/CVE-2023-53186",
  "summary": "CVE-2023-53186 is fixed in 20 products on 1 platform, first by ALAS2023-2023-169, released April 27, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  skbuff: Fix a race between coalescing and releas...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  skbuff: Fix a race between coalescing and releasing SKBs  Commit 1effe8ca4e34 (\u0022skbuff: fix coalescing for page_pool fragment recycling\u0022) allowed coalescing to proceed with non page pool page and page pool page when @from is cloned, i.e.  to-\u003Epp_recycle    --\u003E false from-\u003Epp_recycle  --\u003E true skb_cloned(from)  --\u003E true  However, it actually requires skb_cloned(@from) to hold true until coalescing finishes in this situation. If the other cloned SKB is released while the merging is in process, from_shinfo-\u003Enr_frags will be set to 0 toward the end of the function, causing the increment of frag page _refcount to be unexpectedly skipped resulting in inconsistent reference counts. Later when SKB(@to) is released, it frees the page directly even though the page pool page is still in use, leading to use-after-free or double-free errors. So it should be prohibited.  The double-free error message below prompted us to investigate: BUG: Bad page state in process swapper/1  pfn:0e0d1 page:00000000c6548b28 refcount:-1 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0xe0d1 flags: 0xfffffc0000000(node=0|zone=1|lastcpupid=0x1fffff) raw: 000fffffc0000000 0000000000000000 ffffffff00000101 0000000000000000 raw: 0000000000000002 0000000000000000 ffffffffffffffff 0000000000000000 page dumped because: nonzero _refcount  CPU: 1 PID: 0 Comm: swapper/1 Tainted: G            E      6.2.0\u002B Call Trace:  \u003CIRQ\u003E dump_stack_lvl\u002B0x32/0x50 bad_page\u002B0x69/0xf0 free_pcp_prepare\u002B0x260/0x2f0 free_unref_page\u002B0x20/0x1c0 skb_release_data\u002B0x10b/0x1a0 napi_consume_skb\u002B0x56/0x150 net_rx_action\u002B0xf0/0x350 ? __napi_schedule\u002B0x79/0x90 __do_softirq\u002B0xc8/0x2b1 __irq_exit_rcu\u002B0xb9/0xf0 common_interrupt\u002B0x82/0xa0 \u003C/IRQ\u003E \u003CTASK\u003E asm_common_interrupt\u002B0x22/0x40 RIP: 0010:default_idle\u002B0xb/0x20",
  "published": "2023-04-27T20:00:00Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00267,
  "epssPercentile": 0.18958,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-headers",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-libbpf-static",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.1.25-37.47",
      "release": "amzn 2023",
      "fixedVersion": "1.0-0.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53186",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53186",
      "released": "2025-09-15T14:15:40Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53186",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53186",
      "released": "2025-09-15T14:15:40Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53186",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53186",
      "released": "2025-09-15T14:15:40Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.1.25-37.47.amzn2023",
      "fix": "ALAS2023-2023-169",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-169",
      "released": "2023-04-27T20:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}