{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46333",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46333"
  ],
  "published": "2026-05-15T12:59:03Z",
  "summary": "ptrace: slightly saner 'get_dumpable()' logic",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nptrace: slightly saner 'get_dumpable()' logic\n\nThe 'dumpability' of a task is fundamentally about the memory image of\nthe task - the concept comes from whether it can core dump or not - and\nmakes no sense when you don't have an associated mm.\n\nAnd almost all users do in fact use it only for the case where the task\nhas a mm pointer.\n\nBut we have one odd special case: ptrace_may_access() uses 'dumpable' to\ncheck various other things entirely independently of the MM (typically\nexplicitly using flags like PTRACE_MODE_READ_FSCREDS).  Including for\nthreads that no longer have a VM (and maybe never did, like most kernel\nthreads).\n\nIt's not what this flag was designed for, but it is what it is.\n\nThe ptrace code does check that the uid/gid matches, so you do have to\nbe uid-0 to see kernel thread details, but this means that the\ntraditional \"drop capabilities\" model doesn't make any difference for\nthis all.\n\nMake it all make a *bit* more sense by saying that if you don't have a\nMM pointer, we'll use a cached \"last dumpability\" flag if the thread\never had a MM (it will be zero for kernel threads since it is never\nset), and require a proper CAP_SYS_PTRACE capability to override.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46333"
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      "scenario": "AV:L - The vulnerable authorization check is reached through local interfaces such as ptrace-style checks, procfs, and pidfd_getfd; it is not reachable from network packets or adjacent/physical input.\nAC:L - A local attacker can repeatedly trigger the relevant check and, for exiting tasks, can race pidfd_getfd/procfs access against a target's exit path after exit_mm() but before exit_files(). The race is attacker-driven and does not require unusual kernel configuration or conditions outside the attacker's influence.\nPR:L - An unprivileged local user can target same-UID nondumpable tasks because the vulnerable code skips the dumpability requirement once task->mm is NULL. User-namespace root does not help against init-namespace root kernel threads, but low local privileges are enough for the same-UID exiting-task case.\nUI:N - Exploitation does not require a victim user to open a file or perform an interactive action; the attacker can use local syscalls/procfs against an existing or attacker-terminated target task.\nS:U - The bug bypasses Linux kernel task-access authorization within the same OS security authority. It does not cross a VM, IOMMU, or hypervisor boundary.\nC:H - The bypass can allow access to sensitive task details and, most importantly, pidfd_getfd can duplicate file descriptors from a nondumpable task during the exit window. In a plausible helper/sandbox scenario, those descriptors can expose highly sensitive files or privileged resources.\nI:H - If the duplicated descriptor is writable, the attacker can modify the protected resource reachable through the victim's file descriptor despite the dumpability restriction. This is a high-impact integrity bypass even though the bug is not memory corruption.\nA:N - The issue is an access-control bypass around ptrace/dumpability checks and does not by itself provide a kernel crash, hang, deadlock, or sustained denial of service."
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}