{
  "cveId": "CVE-2026-52997",
  "url": "https://patchblox.com/security/cve/CVE-2026-52997",
  "summary": "CVE-2026-52997 is fixed in 19 products on 1 platform, first by ALAS2023-2026-1866, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/sched: sch_dualpi2: drain both C-queue and L...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/sched: sch_dualpi2: drain both C-queue and L-queue in dualpi2_change()  Fix dualpi2_change() to correctly enforce updated limit and memlimit values after a configuration change of the dualpi2 qdisc.  Before this patch, dualpi2_change() always attempted to dequeue packets via the root qdisc (C-queue) when reducing backlog or memory usage, and unconditionally assumed that a valid skb will be returned. When traffic classification results in packets being queued in the L-queue while the C-queue is empty, this leads to a NULL skb dereference during limit or memlimit enforcement.  This is fixed by first dequeuing from the C-queue path if it is non-empty. Once the C-queue is empty, packets are dequeued directly from the L-queue. Return values from qdisc_dequeue_internal() are checked for both queues. When dequeuing from the L-queue, the parent qdisc qlen and backlog counters are updated explicitly to keep overall qdisc statistics consistent.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0016,
  "epssPercentile": 0.0521,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.33-63.124",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.10-1",
      "fix": "DEBIAN-CVE-2026-52997",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-52997",
      "released": "2026-06-25T17:23:13Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.33-63.124.amzn2023",
      "fix": "ALAS2023-2026-1866",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1866",
      "released": "2026-06-22T09:00:00Z"
    }
  ],
  "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"
  }
}