{"id":"CVE-2026-97920","revision":"2fd02b5bb8b44b9c80a202515f7d4be2","records":[{"revision":"2fd02b5bb8b44b9c80a202515f7d4be2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97920","aliases":[],"title":"tracing: Keep the entry count when the histogram stats allocation fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Keep the entry count when the histogram stats allocation fails\n\nprint_entries() uses n_entries both as the number of sort entries and as\nits own return value, so the -ENOMEM it stores when the stats allocation\nfails overwrites the count that the cleanup still needs:\n\n\tn_entries = tracing_map_sort_entries(map, ...);\n\tif (n_entries < 0)\n\t\treturn n_entries;\n\t...\n\t\t\tif (!stats) {\n\t\t\t\tn_entries = -ENOMEM;\n\t\t\t\tgoto out;\n\t\t\t}\n\t...\n out:\n\ttracing_map_destroy_sort_entries(sort_entries, n_entries);\n\ntracing_map_destroy_sort_entries() takes an unsigned int and loops up to\nit, so -ENOMEM arrives as 4294967284. It walks an array of at most\nmap->max_elts pointers and calls destroy_sort_entry(), which dereferences\nand frees, on whatever lies past the end.\n\nReading the hist file of a trigger with a .percent value, with that\nallocation forced to fail:\n\n BUG: KASAN: vmalloc-out-of-bounds in tracing_map_destroy_sort_entries+0xa0/0xb0\n Read of size 8 at addr ffffc90000045000 by task init/1\n tracing_map_destroy_sort_entries+0xa0/0xb0\n hist_show+0x6f7/0x1df0\n seq_read_iter+0x2b8/0x1190\n vfs_read+0x176/0xa40\n The buggy address belongs to a 4-page vmalloc region starting at\n ffffc90000041000 allocated at tracing_map_sort_entries+0x5c/0xd50\n\nA few pages further the fault is fatal. The registers at the oops confirm\nthe bound: the loop's end pointer less the array start, over the pointer\nsize, is 4294967284.\n\nReturn the error in a separate variable and leave n_entries holding the\ncount, the way tracing_map_sort_entries() does on its own error path.\n\nThe stats block is only entered for a value carrying .percent or .graph,\nwhich __create_val_field() has rejected since v6.3, so this cannot be\nreached in mainline as it stands. It becomes reachable again with\n\"tracing: hist: let values keep the percent and graph modifiers\", so it\nshould be applied first.","state":0,"publishedAt":"2026-09-25T10:22:40.431+00:00","modifiedAt":"2026-10-19T09:10:47.192+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 \"kernel/trace/trace_events_hist.c\"\n ],\n \"versions\": [\n {\n \"version\": \"93454d1a306ea975294b861d32ffa1e44b20c733\",\n \"lessThan\": \"89c978d67ad01ce28223944cc58e95feea177b35\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"abaa5258ce5e5887a9de049f50a85dc023391a1c\",\n \"lessThan\": \"fe05eeed27128e17d38dbc0af02e4470bcecda89\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"abaa5258ce5e5887a9de049f50a85dc023391a1c\",\n \"lessThan\": \"9bd8321f5370295d1ae96dd17d43be3c9edd441b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"abaa5258ce5e5887a9de049f50a85dc023391a1c\",\n \"lessThan\": \"c80b2a8067d58ff7d268ceef781c68b37a16c321\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"abaa5258ce5e5887a9de049f50a85dc023391a1c\",\n \"lessThan\": \"17e87ce55f877efff1b08fe509e8bf91378cbbc9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"abaa5258ce5e5887a9de049f50a85dc023391a1c\",\n \"lessThan\": \"06f5634ec5584954177f9a22e36b3bfb398a971b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.23\",\n \"lessThan\": \"6.1.189\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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 \"kernel/trace/trace_events_hist.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.2\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.2\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.158\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.111\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.53\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.7\",\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/89c978d67ad01ce28223944cc58e95feea177b35","https://git.kernel.org/stable/c/fe05eeed27128e17d38dbc0af02e4470bcecda89","https://git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b","https://git.kernel.org/stable/c/c80b2a8067d58ff7d268ceef781c68b37a16c321","https://git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9","https://git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97920","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97920","identifiers":["CVE-2026-97920"]},"retained":false,"historicalAffected":[]}],"coverage":[]}