{"id":"CVE-2026-90386","revision":"424ac3262a04484bae681a8356e57046","records":[{"revision":"424ac3262a04484bae681a8356e57046","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90386","aliases":[],"title":"i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices","description":"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 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.","state":0,"publishedAt":"2026-09-17T16:09:21.842+00:00","modifiedAt":"2026-10-19T09:02:48.79+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/i3c/master/dw-i3c-master.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"5650b013e6bfc14c8b30be727f4a715b01860a08\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"3a1c35739efb69e8ec2a868113a0471a01bb8f29\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"111f559e5b6461f5f6977275716e6c5d1eb7ea27\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"754533e6169d1f10bdef7a6ba9bd7740b524e1d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"618dd640ded6b94bbdb79c798a901ec564797033\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef\",\n                            \"lessThan\": \"038cf48b3170af26a70bf2dee4f8c3ac910f5176\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/i3c/master/dw-i3c-master.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/5650b013e6bfc14c8b30be727f4a715b01860a08","https://git.kernel.org/stable/c/63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94","https://git.kernel.org/stable/c/3a1c35739efb69e8ec2a868113a0471a01bb8f29","https://git.kernel.org/stable/c/111f559e5b6461f5f6977275716e6c5d1eb7ea27","https://git.kernel.org/stable/c/754533e6169d1f10bdef7a6ba9bd7740b524e1d4","https://git.kernel.org/stable/c/9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c","https://git.kernel.org/stable/c/618dd640ded6b94bbdb79c798a901ec564797033","https://git.kernel.org/stable/c/038cf48b3170af26a70bf2dee4f8c3ac910f5176"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90386","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90386","identifiers":["CVE-2026-90386"]},"retained":false,"historicalAffected":[]}],"coverage":[]}