{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-52946",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-52946"
  ],
  "published": "2026-06-24T16:25:10Z",
  "summary": "fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling\n\nA SOFTIRQ-safe to SOFTIRQ-unsafe lock order deadlock can occur in\nsend_sigio() and send_sigurg() when a process group receives a signal.\n\nWhen FASYNC is configured for a process group (PIDTYPE_PGID), both\nfunctions use read_lock(&tasklist_lock) to traverse the task list.\nHowever, they are frequently called from softirq context:\n- send_sigio() via input_inject_event -> kill_fasync\n- send_sigurg() via tcp_check_urg -> sk_send_sigurg (NET_RX_SOFTIRQ)\n\nThe deadlock is caused by the rwlock writer fairness mechanism:\n1. CPU 0 (process context) holds read_lock(&tasklist_lock) in do_wait().\n2. CPU 1 (process context) attempts write_lock(&tasklist_lock) in\n   fork() or exit() and spins, which blocks all new readers.\n3. CPU 0 is interrupted by a softirq (e.g., TCP URG packet reception).\n4. The softirq calls send_sigurg() and attempts to acquire\n   read_lock(&tasklist_lock), deadlocking because CPU 1 is waiting.\n\nSince PID hashing and do_each_pid_task() traversals are already\nRCU-protected, the read_lock on tasklist_lock is no longer strictly\nrequired for safe traversal. Fix this by replacing tasklist_lock with\nrcu_read_lock(), aligning the process group signaling path with the\nsingle-PID path. This also mitigates a potential remote denial of\nservice vector via TCP URG packets.\n\nLockdep splat:\n=====================================================\nWARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected\n[...]\nChain exists of:\n  &dev->event_lock --> &f_owner->lock --> tasklist_lock\n\nPossible interrupt unsafe locking scenario:\n       CPU0                    CPU1\n       ----                    ----\n  lock(tasklist_lock);\n                           local_irq_disable();\n                           lock(&dev->event_lock);\n                           lock(&f_owner->lock);\n  <Interrupt>\n    lock(&dev->event_lock);\n\n*** DEADLOCK ***",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/32dbd5ce4be3a3ed7e00f8af18795cc84fc50a33"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5fa9e32fb6718f70c986ee14dd5d01b4846f331"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1bee417678f1135e35b25a37734db46aa94258d2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20a93e397abe850c49b6fa0e8cc827b5f634a8f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfcc8e8d8a495bb34cae9e620adfb75fb13a3954"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36c1b57b2ecf3c61ac93f5f07bd29b6f21e226ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00633c4683828acd5256fa8d5163f440d74bbe71"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - A remote TCP peer can reach tcp_check_urg()->sk_send_sigurg()->send_sigurg() by sending TCP packets with the URG flag to a service whose socket owner is configured as a process group. The fix explicitly identifies TCP URG packet reception as a potential remote denial-of-service vector.\nAC:L - The vulnerable condition is a lock-order deadlock, but an attacker can repeatedly send URG packets and, in a plausible forking/waiting network service, induce connection churn that exercises the other tasklist_lock paths. There is no memory-layout dependency or other hard-to-satisfy condition.\nPR:N - The network attacker does not need local privileges or authentication to send TCP URG traffic to an exposed service. The fcntl process-group ownership is target service state, not an attacker privilege requirement.\nUI:N - Exploitation does not require a user to open a file or perform an interactive action. Once the service is reachable and configured, packets alone can trigger the vulnerable path.\nS:U - The impact is within the Linux kernel and the same host security authority. It does not cross a VM, sandbox, or hardware isolation boundary.\nC:N - The bug is a lock ordering deadlock, not a memory disclosure or use-after-free. The fixed traversal is RCU-safe and does not imply an attacker read primitive.\nI:N - The vulnerability does not corrupt memory or provide a write/control-flow primitive. It only causes unsafe lock acquisition ordering during signal delivery.\nA:H - The deadlock can hang kernel execution in softirq/tasklist_lock paths and deny service to the affected system. A kernel deadlock is a high availability impact."
    }
  }
}