{
  "id": "CVE-2024-26761",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-04-03T17:15:52.413",
  "lastModified": "2024-04-03T17:24:18.150",
  "vulnStatus": "Awaiting Analysis",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window\n\nThe Linux CXL subsystem is built on the assumption that HPA == SPA.\nThat is, the host physical address (HPA) the HDM decoder registers are\nprogrammed with are system physical addresses (SPA).\n\nDuring HDM decoder setup, the DVSEC CXL range registers (cxl-3.1,\n8.1.3.8) are checked if the memory is enabled and the CXL range is in\na HPA window that is described in a CFMWS structure of the CXL host\nbridge (cxl-3.1, 9.18.1.3).\n\nNow, if the HPA is not an SPA, the CXL range does not match a CFMWS\nwindow and the CXL memory range will be disabled then. The HDM decoder\nstops working which causes system memory being disabled and further a\nsystem hang during HDM decoder initialization, typically when a CXL\nenabled kernel boots.\n\nPrevent a system hang and do not disable the HDM decoder if the\ndecoder's CXL range is not found in a CFMWS window.\n\nNote the change only fixes a hardware hang, but does not implement\nHPA/SPA translation. Support for this can be added in a follow on\npatch series."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/031217128990d7f0ab8c46db1afb3cf1e075fd29",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0cab687205986491302cd2e440ef1d253031c221",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2cc1a530ab31c65b52daf3cb5d0883c8b614ea69",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3a3181a71935774bda2398451256d7441426420b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}