{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.10-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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+0x27c/0x2c0    ? __pfx_napi_threaded_poll+0x10/0x10    ? napi_threaded_poll+0x26/0x80    ? kthread+0xfa/0x240    ? __pfx_kthread+0x10/0x10    ? ret_from_fork+0x31/0x50    ? __pfx_kthread+0x10/0x10    ? ret_from_fork_asm+0x1a/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't 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.",
  "id": "DEBIAN-CVE-2026-43385",
  "modified": "2026-09-14T16:47:31.560283073Z",
  "published": "2026-05-08T15:16:49.830Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-43385"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-43385"
  ]
}