{
  "cveId": "CVE-2023-53326",
  "url": "https://patchblox.com/security/cve/CVE-2023-53326",
  "summary": "CVE-2023-53326 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53326, released September 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc: Don\u0027t try to copy PPR for task with NUL...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc: Don\u0027t try to copy PPR for task with NULL pt_regs  powerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which from my (arguably very short) checking is not commonly done for other archs. This is fine, except when PF_IO_WORKER\u0027s have been created and the task does something that causes a coredump to be generated. Then we get this crash:    Kernel attempted to read user page (160) - exploit attempt? (uid: 1000)   BUG: Kernel NULL pointer dereference on read at 0x00000160   Faulting instruction address: 0xc0000000000c3a60   Oops: Kernel access of bad area, sig: 11 [#1]   LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=32 NUMA pSeries   Modules linked in: bochs drm_vram_helper drm_kms_helper xts binfmt_misc ecb ctr syscopyarea sysfillrect cbc sysimgblt drm_ttm_helper aes_generic ttm sg libaes evdev joydev virtio_balloon vmx_crypto gf128mul drm dm_mod fuse loop configfs drm_panel_orientation_quirks ip_tables x_tables autofs4 hid_generic usbhid hid xhci_pci xhci_hcd usbcore usb_common sd_mod   CPU: 1 PID: 1982 Comm: ppc-crash Not tainted 6.3.0-rc2\u002B #88   Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries   NIP:  c0000000000c3a60 LR: c000000000039944 CTR: c0000000000398e0   REGS: c0000000041833b0 TRAP: 0300   Not tainted  (6.3.0-rc2\u002B)   MSR:  800000000280b033 \u003CSF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE\u003E  CR: 88082828  XER: 200400f8   ...   NIP memcpy_power7\u002B0x200/0x7d0   LR  ppr_get\u002B0x64/0xb0   Call Trace:     ppr_get\u002B0x40/0xb0 (unreliable)     __regset_get\u002B0x180/0x1f0     regset_get_alloc\u002B0x64/0x90     elf_core_dump\u002B0xb98/0x1b60     do_coredump\u002B0x1c34/0x24a0     get_signal\u002B0x71c/0x1410     do_notify_resume\u002B0x140/0x6f0     interrupt_exit_user_prepare_main\u002B0x29c/0x320     interrupt_exit_user_prepare\u002B0x6c/0xa0     interrupt_return_srr_user\u002B0x8/0x138  Because ppr_get() is trying to copy from a PF_IO_WORKER with a NULL pt_regs.  Check for a valid pt_regs in both ppc_get/ppr_set, and return an error if not set. The actual error value doesn\u0027t seem to be important here, so just pick -EINVAL.  [mpe: Trim oops in change log, add Fixes \u0026 Cc stable]",
  "published": "2025-09-16T17:15:38Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00148,
  "epssPercentile": 0.04028,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53326",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53326",
      "released": "2025-09-16T17:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53326",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53326",
      "released": "2025-09-16T17:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53326",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53326",
      "released": "2025-09-16T17:15:38Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}