{
  "cveId": "CVE-2026-31579",
  "url": "https://patchblox.com/security/cve/CVE-2026-31579",
  "summary": "CVE-2026-31579 is fixed in 19 products on 1 platform, first by ALAS2023-2026-1693, released May 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit  wg_netns_pre_exit() manually acquires rtnl_lock() inside the pernet .pre_exit callback.  This causes a hung task when another thread holds rtnl_mutex - the cleanup_net workqueue (or the setup_net failure rollback path) blocks indefinitely in wg_netns_pre_exit() waiting to acquire the lock.  Convert to .exit_rtnl, introduced in commit 7a60d91c690b (\u0022net: Add -\u003Eexit_rtnl() hook to struct pernet_operations.\u0022), where the framework already holds RTNL and batches all callbacks under a single rtnl_lock()/rtnl_unlock() pair, eliminating the contention window.  The rcu_assign_pointer(wg-\u003Ecreating_net, NULL) is safe to move from .pre_exit to .exit_rtnl (which runs after synchronize_rcu()) because all RCU readers of creating_net either use maybe_get_net() - which returns NULL for a dying namespace with zero refcount - or access net-\u003Euser_ns which remains valid throughout the entire ops_undo_list sequence.  [ Jason: added __net_exit and __read_mostly annotations that were missing. ]",
  "published": "2026-04-24T15:16:32Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00155,
  "epssPercentile": 0.04639,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31579",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.25-55.108",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-31579",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31579",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.14-1",
      "fix": "DEBIAN-CVE-2026-31579",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31579",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.25-55.108.amzn2023",
      "fix": "ALAS2023-2026-1693",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1693",
      "released": "2026-05-08T18:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}