{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97920","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:18:58.202Z","datePublished":"2026-09-25T10:22:40.431Z","dateUpdated":"2026-10-03T11:00:32.808Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T11:00:32.808Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_events_hist.c"],"versions":[{"version":"93454d1a306ea975294b861d32ffa1e44b20c733","lessThan":"89c978d67ad01ce28223944cc58e95feea177b35","status":"affected","versionType":"git"},{"version":"abaa5258ce5e5887a9de049f50a85dc023391a1c","lessThan":"fe05eeed27128e17d38dbc0af02e4470bcecda89","status":"affected","versionType":"git"},{"version":"abaa5258ce5e5887a9de049f50a85dc023391a1c","lessThan":"9bd8321f5370295d1ae96dd17d43be3c9edd441b","status":"affected","versionType":"git"},{"version":"abaa5258ce5e5887a9de049f50a85dc023391a1c","lessThan":"c80b2a8067d58ff7d268ceef781c68b37a16c321","status":"affected","versionType":"git"},{"version":"abaa5258ce5e5887a9de049f50a85dc023391a1c","lessThan":"17e87ce55f877efff1b08fe509e8bf91378cbbc9","status":"affected","versionType":"git"},{"version":"abaa5258ce5e5887a9de049f50a85dc023391a1c","lessThan":"06f5634ec5584954177f9a22e36b3bfb398a971b","status":"affected","versionType":"git"},{"version":"6.1.23","lessThan":"6.1.189","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_events_hist.c"],"versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.23","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.3-rc3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/89c978d67ad01ce28223944cc58e95feea177b35"},{"url":"https://git.kernel.org/stable/c/fe05eeed27128e17d38dbc0af02e4470bcecda89"},{"url":"https://git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b"},{"url":"https://git.kernel.org/stable/c/c80b2a8067d58ff7d268ceef781c68b37a16c321"},{"url":"https://git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9"},{"url":"https://git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b"}],"title":"tracing: Keep the entry count when the histogram stats allocation fails","x_generator":{"engine":"bippy-1.2.0"}}}}