{
  "cveId": "CVE-2026-74337",
  "url": "https://patchblox.com/security/cve/CVE-2026-74337",
  "summary": "CVE-2026-74337 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-74337, released August 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "bpf: Fix NMI/tracepoint re-entry deadlock on lru locks",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix NMI/tracepoint re-entry deadlock on lru locks  NMI and tracepoint BPF programs can re-enter the per-CPU or global LRU lock that bpf_lru_pop_free()/push_free() already hold on the same CPU, AA-deadlocking. Lockdep reports \u0022inconsistent {INITIAL USE} -\u003E {IN-NMI}\u0022 on \u0026l-\u003Elock (syzbot c69a0a2c816716f1e0d5) and \u0022possible recursive locking detected\u0022 on \u0026loc_l-\u003Elock (syzbot 18b26edb69b2e19f3b33).  Prior trylock and rqspinlock based fixes (see links) were nacked because compromised on reliability.  This patch converts every LRU lock site to rqspinlock_t and adds a recovery path for some failure windows to avoid node leaks.  Failure recovery:   - *_pop_free top-level: return NULL; prealloc_lru_pop() already    treats that as no-free-element (-ENOMEM).   - Cross-CPU steal: skip the victim\u0027s locked loc_l, try next CPU.   - Post-steal local lock fail: publish stolen node to lockless    per-CPU free_llist; next pop on this CPU picks it up.   - push_free fail: mark node pending_free=1. __local_list_flush(),    __local_list_pop_pending() reclaim the node from pending_list.    __bpf_lru_list_shrink_inactive() reclaims the node from inactive    list. Nodes from active list are reclaimed by __bpf_lru_list_shrink()    or after __bpf_lru_list_rotate_active() demotes it to the inactive.",
  "published": "2026-08-15T06:22:34Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00206,
  "epssPercentile": 0.10766,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74337",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.41-94.142",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.5-1",
      "fix": "DEBIAN-CVE-2026-74337",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74337",
      "released": "2026-08-15T22:38:55Z"
    },
    {
      "platform": "linux",
      "product": "microvm-kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.41-94.142.amzn2023",
      "fix": "ALAS2023-2026-2071",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2071",
      "released": "2026-08-31T09:00:00Z"
    }
  ],
  "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"
  }
}