{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef"
            },
            {
              "fixed": "5650b013e6bfc14c8b30be727f4a715b01860a08"
            },
            {
              "fixed": "63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94"
            },
            {
              "fixed": "3a1c35739efb69e8ec2a868113a0471a01bb8f29"
            },
            {
              "fixed": "111f559e5b6461f5f6977275716e6c5d1eb7ea27"
            },
            {
              "fixed": "754533e6169d1f10bdef7a6ba9bd7740b524e1d4"
            },
            {
              "fixed": "9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c"
            },
            {
              "fixed": "618dd640ded6b94bbdb79c798a901ec564797033"
            },
            {
              "fixed": "038cf48b3170af26a70bf2dee4f8c3ac910f5176"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90386.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: dw: avoid shift-out-of-bounds when DAA assigns no devices\n\nOn an empty bus ENTDAA assigns nothing, so cmd-\u003erx_len (the count\nof addresses left unassigned) equals master-\u003emaxdevs.\n\nThe GENMASK() index master-\u003emaxdevs - cmd-\u003erx_len - 1 then becomes -1,\nwhich trips up UBSAN. This happens every time on boot on a Gigabyte/AMD\nserver:\n\n    UBSAN: shift-out-of-bounds in drivers/i3c/master/dw-i3c-master.c:905:12\n    shift exponent 64 is too large for 64-bit type 'long unsigned int'\n    CPU: 7 UID: 0 PID: 963 Comm: (udev-worker) Not tainted 7.0.11-200.fc44.x86_64 #1 PREEMPT(lazy)\n    Hardware name: Giga Computing E163-Z34-AAH1-000/MZ33-DC1-000, BIOS R32_F45 04/01/2026\n    Call Trace:\n     \u003cTASK\u003e\n     dump_stack_lvl+0x5d/0x80\n     ubsan_epilogue+0x5/0x2b\n     __ubsan_handle_shift_out_of_bounds.cold+0xd7/0x1ab\n     dw_i3c_master_daa.cold+0x1b/0x96 [dw_i3c_master]\n     i3c_master_do_daa_ext.part.0+0x3e/0xf0 [i3c]\n\nSkip the mask when no new device was assigned.",
  "id": "CVE-2026-90386",
  "modified": "2026-09-19T03:31:01.436171348Z",
  "published": "2026-09-17T16:09:21.842Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/038cf48b3170af26a70bf2dee4f8c3ac910f5176"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/111f559e5b6461f5f6977275716e6c5d1eb7ea27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a1c35739efb69e8ec2a868113a0471a01bb8f29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5650b013e6bfc14c8b30be727f4a715b01860a08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/618dd640ded6b94bbdb79c798a901ec564797033"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/754533e6169d1f10bdef7a6ba9bd7740b524e1d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90386.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90386"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices"
}