{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56701",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-56701"
  ],
  "published": "2024-12-28T09:46:17Z",
  "summary": "powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Fix dtl_access_lock to be a rw_semaphore\n\nThe dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because\nthe code calls kmalloc() while holding it, which can sleep:\n\n  # echo 1 > /proc/powerpc/vcpudispatch_stats\n  BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh\n  preempt_count: 1, expected: 0\n  3 locks held by sh/199:\n   #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438\n   #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4\n   #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4\n  CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152\n  Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries\n  Call Trace:\n    dump_stack_lvl+0x130/0x148 (unreliable)\n    __might_resched+0x174/0x410\n    kmem_cache_alloc_noprof+0x340/0x3d0\n    alloc_dtl_buffers+0x124/0x1ac\n    vcpudispatch_stats_write+0x2a8/0x5f4\n    proc_reg_write+0xf4/0x150\n    vfs_write+0xfc/0x438\n    ksys_write+0x88/0x148\n    system_call_exception+0x1c4/0x5a0\n    system_call_common+0xf4/0x258",
  "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": "6.1.120",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56701"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6956c0e7346ce1bbfc726755aa8da10d26e84276"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f6ec133668757f84e5143f1eb141fd0b83778b9e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fa5b5ea257135e771b489c83a2e93b5935d0108e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a246daa26b717e755ccc9061f47f7cd1c0b358dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b125d0cf1adde7b2b47d7337fed7e9133eea3463"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/525e18f1ba7c2b098c8ba587fb397efb34a6574c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cadae3a45d23aa4f6485938a67cbc47aaaa25e38"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}