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i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices

Type: advisorySource: Official CVE List1 source record

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->rx_len (the count of addresses left unassigned) equals master->maxdevs. The GENMASK() index master->maxdevs - cmd->rx_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: 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.

Announced Source revision 1
Original source ↗

CVE-2026-90386

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90386

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "5650b013e6bfc14c8b30be727f4a715b01860a08",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "3a1c35739efb69e8ec2a868113a0471a01bb8f29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "111f559e5b6461f5f6977275716e6c5d1eb7ea27",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "754533e6169d1f10bdef7a6ba9bd7740b524e1d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "618dd640ded6b94bbdb79c798a901ec564797033",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef",
        "lessThan": "038cf48b3170af26a70bf2dee4f8c3ac910f5176",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/i3c/master/dw-i3c-master.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/i3c/master/dw-i3c-master.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90386

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36709 · Revision 1
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