{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-54267",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-54267"
  ],
  "published": "2025-12-30T12:20:26Z",
  "summary": "powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT\n\nlppaca_shared_proc() takes a pointer to the lppaca which is typically\naccessed through get_lppaca().  With DEBUG_PREEMPT enabled, this leads\nto checking if preemption is enabled, for example:\n\n  BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693\n  caller is lparcfg_data+0x408/0x19a0\n  CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2\n  Call Trace:\n    dump_stack_lvl+0x154/0x200 (unreliable)\n    check_preemption_disabled+0x214/0x220\n    lparcfg_data+0x408/0x19a0\n    ...\n\nThis isn't actually a problem however, as it does not matter which\nlppaca is accessed, the shared proc state will be the same.\nvcpudispatch_stats_procfs_init() already works around this by disabling\npreemption, but the lparcfg code does not, erroring any time\n/proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled.\n\nInstead of disabling preemption on the caller side, rework\nlppaca_shared_proc() to not take a pointer and instead directly access\nthe lppaca, bypassing any potential preemption checks.\n\n[mpe: Rework to avoid needing a definition in paca.h and lppaca.h]",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.53",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-54267"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/953c54dfdc5d3eb7243ed902b50acb5ea1db4355"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2935443dc9c28499223d8c881474259e4b998f2a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c8568cf4c45b415854195c8832b557cdefba57a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c5e8e666794d7dde6d14ea846c6c04f2bb34900"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f45ee5c074013a0fbfce77a5af5efddb01f5d4f4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eac030b22ea12cdfcbb2e941c21c03964403c63f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}