{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices  On an empty bus ENTDAA assigns nothing, so cmd-\u003erx_len (the count of addresses left unassigned) equals master-\u003emaxdevs.  The GENMASK() index master-\u003emaxdevs - cmd-\u003erx_len - 1 then becomes -1, which trips up UBSAN. This happens every time on boot on a Gigabyte/AMD server:      UBSAN: shift-out-of-bounds in drivers/i3c/master/dw-i3c-master.c:905:12     shift exponent 64 is too large for 64-bit type 'long unsigned int'     CPU: 7 UID: 0 PID: 963 Comm: (udev-worker) Not tainted 7.0.11-200.fc44.x86_64 #1 PREEMPT(lazy)     Hardware name: Giga Computing E163-Z34-AAH1-000/MZ33-DC1-000, BIOS R32_F45 04/01/2026     Call Trace:      \u003cTASK\u003e      dump_stack_lvl+0x5d/0x80      ubsan_epilogue+0x5/0x2b      __ubsan_handle_shift_out_of_bounds.cold+0xd7/0x1ab      dw_i3c_master_daa.cold+0x1b/0x96 [dw_i3c_master]      i3c_master_do_daa_ext.part.0+0x3e/0xf0 [i3c]  Skip the mask when no new device was assigned.",
  "id": "DEBIAN-CVE-2026-90386",
  "modified": "2026-09-18T04:47:38.421897423Z",
  "published": "2026-09-17T17:17:37.993Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90386"
    }
  ],
  "upstream": [
    "CVE-2026-90386"
  ]
}