{"id":"CVE-2026-98848","revision":"0f9b731724db424a9dad64d6606fe50f","records":[{"revision":"0f9b731724db424a9dad64d6606fe50f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98848","aliases":[],"title":"rtc: ac100: Assign .num before accessing .hws","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: ac100: Assign .num before accessing .hws\n\nCommit f316cdff8d67 (\"clk: Annotate struct clk_hw_onecell_data with\n__counted_by\") annotated the hws member of 'struct clk_hw_onecell_data'\nwith __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)\nabout the number of elements in .hws[], so that it can warn when .hws[]\nis accessed out of bounds. As noted in that change, the __counted_by\nmember must be initialized with the number of elements before the first\narray access happens, otherwise there will be a warning from each access\nprior to the initialization because the number of elements is zero.\nThis occurs in ac100_rtc_register_clks() due to .num being assigned only\nafter every clkout clock has been stored in .hws[]. With\nCONFIG_UBSAN_BOUNDS and a compiler that implements __counted_by (GCC\n15.1+ or Clang 20.1+), this triggers an array-index-out-of-bounds report\nduring probe, and with CONFIG_UBSAN_TRAP the first store traps.\n\nInitialize .num with AC100_CLKOUT_NUM, the number of elements .hws[] was\nallocated with, right after the allocation. That is the value the loop\ncounter ends up at on the success path anyway, so the provider's\nbehaviour is unchanged.","state":0,"publishedAt":"2026-10-18T15:50:47.105+00:00","modifiedAt":"2026-10-21T12:57:28.688+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/rtc/rtc-ac100.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f316cdff8d677db9ad9c90acb44c4cd535b0ee27\",\n                            \"lessThan\": \"e77c5fc1f39fdb06ecd1f55b101eea1e1db2ffef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f316cdff8d677db9ad9c90acb44c4cd535b0ee27\",\n                            \"lessThan\": \"6bb55381daf1a1bed0657189a1396e7467712525\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f316cdff8d677db9ad9c90acb44c4cd535b0ee27\",\n                            \"lessThan\": \"160619b38707241e22569f9c983a4b3d0890996a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f316cdff8d677db9ad9c90acb44c4cd535b0ee27\",\n                            \"lessThan\": \"ad1bf77039cba83373bf1eff3784655e3e3ed2ab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f316cdff8d677db9ad9c90acb44c4cd535b0ee27\",\n                            \"lessThan\": \"6a4117eee82dd85f11bf898bf66026764011eeb6\",\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/rtc/rtc-ac100.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.113\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.56\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.10\",\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/e77c5fc1f39fdb06ecd1f55b101eea1e1db2ffef","https://git.kernel.org/stable/c/6bb55381daf1a1bed0657189a1396e7467712525","https://git.kernel.org/stable/c/160619b38707241e22569f9c983a4b3d0890996a","https://git.kernel.org/stable/c/ad1bf77039cba83373bf1eff3784655e3e3ed2ab","https://git.kernel.org/stable/c/6a4117eee82dd85f11bf898bf66026764011eeb6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98848","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98848","identifiers":["CVE-2026-98848"]},"retained":false,"historicalAffected":[]}],"coverage":[]}