{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46173",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46173"
  ],
  "published": "2026-05-28T09:36:53Z",
  "summary": "exit: prevent preemption of oopsing TASK_DEAD task",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexit: prevent preemption of oopsing TASK_DEAD task\n\nWhen an already-exiting task oopses, make_task_dead() currently calls\ndo_task_dead() with preemption enabled.  That is forbidden:\ndo_task_dead() calls __schedule(), which has a comment saying \"WARNING:\nmust be called with preemption disabled!\".\n\nIf an oopsing task is preempted in do_task_dead(), between becoming\nTASK_DEAD and entering the scheduler explicitly, bad things happen:\nfinish_task_switch() assumes that once the scheduler has switched away\nfrom a TASK_DEAD task, the task can never run again and its stack is no\nlonger needed; but that assumption apparently doesn't hold if the dead\ntask was preempted (the SM_PREEMPT case).\n\nThis means that the scheduler ends up repeatedly dropping references on\nthe dead task's stack, which can lead to use-after-free or double-free\nof the entire task stack; in other words, two tasks can end up running\non the same stack, resulting in various kinds of memory corruption.\n\n(This does not just affect \"recursively oopsing\" tasks; it is enough to\noops once during task exit, for example in a file_operations::release\nhandler)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46173"
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      "scenario": "AV:L - The vulnerability is in the kernel task-exit/scheduler path (`make_task_dead` \u2192 `do_task_dead`) of a local process; it is triggered by a task oopsing during its own exit, with no remote network reachability.\nAC:L - Exploitation depends on a preemption-timing window between `set_special_state(TASK_DEAD)` and `__schedule()`, but the attacker can repeatedly spawn exiting+faulting tasks and generate CPU load to induce preemption, making the race winnable; per the uncertainty rule the higher-severity value is chosen.\nPR:L - Any unprivileged local user can spawn processes that exit and fault on the exit path; no real-root or init-namespace privilege is required.\nUI:N - The attacker triggers their own process exit and fault; no action by another user is needed.\nS:U - The use-after-free/double-free corrupts kernel task-stack memory within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The double-free/UAF of the task stack lets two tasks run on the same stack, giving the attacker control over freed memory contents and thus an arbitrary kernel-memory read primitive.\nI:H - The same task-stack UAF/double-free yields an arbitrary write / control-flow-hijack primitive (heap spray, overlapping stacks), enabling privilege escalation.\nA:H - The repeated reference drops cause double-free/use-after-free memory corruption that reliably leads to kernel panic."
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}