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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2023-01-01T00:00:00Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Don't try to copy PPR for task with NULL pt_regs\n\npowerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which\nfrom my (arguably very short) checking is not commonly done for other\narchs. This is fine, except when PF_IO_WORKER's have been created and\nthe task does something that causes a coredump to be generated. Then we\nget this crash:\n\n  Kernel attempted to read user page (160) - exploit attempt? (uid: 1000)\n  BUG: Kernel NULL pointer dereference on read at 0x00000160\n  Faulting instruction address: 0xc0000000000c3a60\n  Oops: Kernel access of bad area, sig: 11 [#1]\n  LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=32 NUMA pSeries\n  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\n  CPU: 1 PID: 1982 Comm: ppc-crash Not tainted 6.3.0-rc2+ #88\n  Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries\n  NIP:  c0000000000c3a60 LR: c000000000039944 CTR: c0000000000398e0\n  REGS: c0000000041833b0 TRAP: 0300   Not tainted  (6.3.0-rc2+)\n  MSR:  800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 88082828  XER: 200400f8\n  ...\n  NIP memcpy_power7+0x200/0x7d0\n  LR  ppr_get+0x64/0xb0\n  Call Trace:\n    ppr_get+0x40/0xb0 (unreliable)\n    __regset_get+0x180/0x1f0\n    regset_get_alloc+0x64/0x90\n    elf_core_dump+0xb98/0x1b60\n    do_coredump+0x1c34/0x24a0\n    get_signal+0x71c/0x1410\n    do_notify_resume+0x140/0x6f0\n    interrupt_exit_user_prepare_main+0x29c/0x320\n    interrupt_exit_user_prepare+0x6c/0xa0\n    interrupt_return_srr_user+0x8/0x138\n\nBecause ppr_get() is trying to copy from a PF_IO_WORKER with a NULL\npt_regs.\n\nCheck for a valid pt_regs in both ppc_get/ppr_set, and return an error\nif not set. The actual error value doesn't seem to be important here, so\njust pick -EINVAL.\n\n[mpe: Trim oops in change log, add Fixes & Cc stable]",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2023-53326"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/01849382373b867ddcbe7536b9dfa89f3bcea60e",
          "url": "https://git.kernel.org/stable/c/01849382373b867ddcbe7536b9dfa89f3bcea60e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/064a1c7b0f8403260d77627e62424a72ca26cee2",
          "url": "https://git.kernel.org/stable/c/064a1c7b0f8403260d77627e62424a72ca26cee2"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7624973bc15b76d000e8e6f9b8080fcb76d36595",
          "url": "https://git.kernel.org/stable/c/7624973bc15b76d000e8e6f9b8080fcb76d36595"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/80a4200d51e5a7e046f4a90f5faa5bafd5a60c58",
          "url": "https://git.kernel.org/stable/c/80a4200d51e5a7e046f4a90f5faa5bafd5a60c58"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/fd7276189450110ed835eb0a334e62d2f1c4e3be",
          "url": "https://git.kernel.org/stable/c/fd7276189450110ed835eb0a334e62d2f1c4e3be"
        }
      ],
      "release_date": "2025-09-16T17:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T16:29:45.035639Z",
          "details": "CVE-2023-53326 is confined to Linux kernels on the PowerPC architecture and triggers only when a process with PF_IO_WORKER kernel threads generates a core dump, leading to a NULL-pt_regs dereference and a denial‑of‑service (crash) without any confidentiality or integrity impact. Exploitation is local-only and requires the ability to run code and induce a coredump, offering no privilege escalation. Systems running x86_64 or arm64 kernels are not affected, so environments without PowerPC deployments can safely deprioritize this issue.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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}