{
  "cveId": "CVE-2026-99072",
  "url": "https://patchblox.com/security/cve/CVE-2026-99072",
  "summary": "CVE-2026-99072 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-99072, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ipv4: stop route notification sizing when nexthop group shrinks",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ipv4: stop route notification sizing when nexthop group shrinks  Commit 680aea08e78c (\u0022net: ipv4: Emit notification when fib hardware flags are changed\u0022) added an RCU-only fib_nlmsg_size() call for asynchronous hardware flag notifications.  fib_nlmsg_size() checks fib_info_num_path() before each iteration, then fib_info_nhc() independently reloads nh-\u003Enh_grp. If RTM_NEWNEXTHOP replaces a group with fewer paths between those loads, fib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences it.  Stop sizing when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.",
  "published": "2026-10-23T13:17:31Z",
  "severity": "Moderate",
  "cvss": 4.1,
  "epss": 0.00161,
  "epssPercentile": 0.05322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99072",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.12.113-138.209",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.12-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-99072",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99072",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.11-1",
      "fix": "DEBIAN-CVE-2026-99072",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99072",
      "released": "2026-10-24T13:25:57Z"
    },
    {
      "platform": "linux",
      "product": "perf6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.113-138.209.amzn2023",
      "fix": "ALAS2023-2026-3335",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3335",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "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"
  }
}