{
  "cveId": "CVE-2026-43385",
  "url": "https://patchblox.com/security/cve/CVE-2026-43385",
  "summary": "CVE-2026-43385 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43385 (version 6.19.10-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: Fix rcu_tasks stall in threaded busypoll  I...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: Fix rcu_tasks stall in threaded busypoll  I was debugging a NIC driver when I noticed that when I enable threaded busypoll, bpftrace hangs when starting up. dmesg showed:    rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 10658 jiffies old.   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 40793 jiffies old.   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 131273 jiffies old.   rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 402058 jiffies old.   INFO: rcu_tasks detected stalls on tasks:   00000000769f52cd: .N nvcsw: 2/2 holdout: 1 idle_cpu: -1/64   task:napi/eth2-8265  state:R  running task     stack:0     pid:48300 tgid:48300 ppid:2      task_flags:0x208040 flags:0x00004000   Call Trace:    \u003CTASK\u003E    ? napi_threaded_poll_loop\u002B0x27c/0x2c0    ? __pfx_napi_threaded_poll\u002B0x10/0x10    ? napi_threaded_poll\u002B0x26/0x80    ? kthread\u002B0xfa/0x240    ? __pfx_kthread\u002B0x10/0x10    ? ret_from_fork\u002B0x31/0x50    ? __pfx_kthread\u002B0x10/0x10    ? ret_from_fork_asm\u002B0x1a/0x30    \u003C/TASK\u003E  The cause is that in threaded busypoll, the main loop is in napi_threaded_poll rather than napi_threaded_poll_loop, where the latter rarely iterates more than once within its loop. For rcu_softirq_qs_periodic inside napi_threaded_poll_loop to report its qs state, the last_qs must be 100ms behind, and this can\u0027t happen because napi_threaded_poll_loop rarely iterates in threaded busypoll, and each time napi_threaded_poll_loop is called last_qs is reset to latest jiffies.  This patch changes so that in threaded busypoll, last_qs is saved in the outer napi_threaded_poll, and whether busy_poll_last_qs is NULL indicates whether napi_threaded_poll_loop is called for busypoll. This way last_qs would not reset to latest jiffies on each invocation of napi_threaded_poll_loop.",
  "published": "2026-05-08T15:16:49Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00344,
  "epssPercentile": 0.28084,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.10-1",
      "fix": "DEBIAN-CVE-2026-43385",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43385",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}