FKIE_CVE-2025-39788

Vulnerability from fkie_nvd - Published: 2025-09-11 17:15 - Updated: 2025-11-03 18:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE On Google gs101, the number of UTP transfer request slots (nutrs) is 32, and in this case the driver ends up programming the UTRL_NEXUS_TYPE incorrectly as 0. This is because the left hand side of the shift is 1, which is of type int, i.e. 31 bits wide. Shifting by more than that width results in undefined behaviour. Fix this by switching to the BIT() macro, which applies correct type casting as required. This ensures the correct value is written to UTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift warning: UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21 shift exponent 32 is too large for 32-bit type 'int' For consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE write.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01510a9e8222f11cce064410f3c2fcf0756c0a08
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01aad16c2257ab8ff33b152b972c9f2e1af47912
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/098b2c8ee208c77126839047b9e6e1925bb35baa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b9f1ef293428ea9c0871d96fcec2a87c4445832
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d53b2a134da77eb7fe65c5c7c7a3c193539a78a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1f025da8f370a015e412b55cbcc583f91de8316
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc8fb963742f1a38d284946638f9358bdaa0ddee
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE\n\nOn Google gs101, the number of UTP transfer request slots (nutrs) is 32,\nand in this case the driver ends up programming the UTRL_NEXUS_TYPE\nincorrectly as 0.\n\nThis is because the left hand side of the shift is 1, which is of type\nint, i.e. 31 bits wide. Shifting by more than that width results in\nundefined behaviour.\n\nFix this by switching to the BIT() macro, which applies correct type\ncasting as required. This ensures the correct value is written to\nUTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift\nwarning:\n\n    UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21\n    shift exponent 32 is too large for 32-bit type \u0027int\u0027\n\nFor consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE\nwrite."
    }
  ],
  "id": "CVE-2025-39788",
  "lastModified": "2025-11-03T18:16:47.330",
  "metrics": {},
  "published": "2025-09-11T17:15:45.070",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/01510a9e8222f11cce064410f3c2fcf0756c0a08"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/01aad16c2257ab8ff33b152b972c9f2e1af47912"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/098b2c8ee208c77126839047b9e6e1925bb35baa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b9f1ef293428ea9c0871d96fcec2a87c4445832"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6d53b2a134da77eb7fe65c5c7c7a3c193539a78a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1f025da8f370a015e412b55cbcc583f91de8316"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc8fb963742f1a38d284946638f9358bdaa0ddee"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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