{"id":"CVE-2026-90386","title":"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->rx_len (the count\nof addresses left unassigned) equals m…","summary":"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->rx_len (the count\nof addresses left unassigned) equals m…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 5650b013e6bfc14c8b30be727f4a715b01860a08","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 3a1c35739efb69e8ec2a868113a0471a01bb8f29","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 111f559e5b6461f5f6977275716e6c5d1eb7ea27","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 754533e6169d1f10bdef7a6ba9bd7740b524e1d4","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 618dd640ded6b94bbdb79c798a901ec564797033","Linux >= 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef < 038cf48b3170af26a70bf2dee4f8c3ac910f5176","Linux 5.0"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:37.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90386","references":[{"url":"https://git.kernel.org/stable/c/038cf48b3170af26a70bf2dee4f8c3ac910f5176","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/111f559e5b6461f5f6977275716e6c5d1eb7ea27","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3a1c35739efb69e8ec2a868113a0471a01bb8f29","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5650b013e6bfc14c8b30be727f4a715b01860a08","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/618dd640ded6b94bbdb79c798a901ec564797033","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/754533e6169d1f10bdef7a6ba9bd7740b524e1d4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.806Z","epss":0.00211,"epssPercentile":0.11604,"slug":"CVE-2026-90386","body":"## Overview\n\nIn 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->rx_len (the count\nof addresses left unassigned) equals master->maxdevs.\n\nThe GENMASK() index master->maxdevs - cmd->rx_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     <TASK>\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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}