CVE-2023-53326 (GCVE-0-2023-53326)

Vulnerability from cvelistv5 – Published: 2025-09-16 16:12 – Updated: 2026-05-11 19:42
VLAI
Title
powerpc: Don't try to copy PPR for task with NULL pt_regs
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc: Don't 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's 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+ #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+) MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 88082828 XER: 200400f8 ... NIP memcpy_power7+0x200/0x7d0 LR ppr_get+0x64/0xb0 Call Trace: ppr_get+0x40/0xb0 (unreliable) __regset_get+0x180/0x1f0 regset_get_alloc+0x64/0x90 elf_core_dump+0xb98/0x1b60 do_coredump+0x1c34/0x24a0 get_signal+0x71c/0x1410 do_notify_resume+0x140/0x6f0 interrupt_exit_user_prepare_main+0x29c/0x320 interrupt_exit_user_prepare+0x6c/0xa0 interrupt_return_srr_user+0x8/0x138 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't seem to be important here, so just pick -EINVAL. [mpe: Trim oops in change log, add Fixes & Cc stable]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:28 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6651 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fa439810cc1b3c927ec24ede17d02467e1b143a1 , < 80a4200d51e5a7e046f4a90f5faa5bafd5a60c58 (git)
Affected: fa439810cc1b3c927ec24ede17d02467e1b143a1 , < 7624973bc15b76d000e8e6f9b8080fcb76d36595 (git)
Affected: fa439810cc1b3c927ec24ede17d02467e1b143a1 , < 064a1c7b0f8403260d77627e62424a72ca26cee2 (git)
Affected: fa439810cc1b3c927ec24ede17d02467e1b143a1 , < 01849382373b867ddcbe7536b9dfa89f3bcea60e (git)
Affected: fa439810cc1b3c927ec24ede17d02467e1b143a1 , < fd7276189450110ed835eb0a334e62d2f1c4e3be (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.177 , ≤ 5.10.* (semver)
Unaffected: 5.15.106 , ≤ 5.15.* (semver)
Unaffected: 6.1.23 , ≤ 6.1.* (semver)
Unaffected: 6.2.10 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Don\u0027t 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\u0027s 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 \u003cSF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE\u003e  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\u0027t seem to be important here, so\njust pick -EINVAL.\n\n[mpe: Trim oops in change log, add Fixes \u0026 Cc stable]"
          }
        ],
        "id": "CVE-2023-53326",
        "lastModified": "2026-06-17T06:44:53.877",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
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                "confidentialityImpact": "NONE",
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                "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",
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                "userInteraction": "NONE",
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                "role": "CISA Coordinator",
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        "published": "2025-09-16T17:15:38.783",
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        "vulnStatus": "Modified",
        "weaknesses": [
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            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T04:51:57+00:00",
      "cve": "CVE-2023-53326",
      "id": "CVE-2023-53326",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "157",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc: Don\u0027t try to copy PPR for task with NULL pt_regs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53326.json",
      "version": "3"
    },
    "vulnrichment": {
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              {
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          "cpeApplicability": [
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Don\u0027t 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\u0027s 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 \u003cSF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE\u003e  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\u0027t seem to be important here, so\njust pick -EINVAL.\n\n[mpe: Trim oops in change log, add Fixes \u0026 Cc stable]"
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}



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