{ "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": "2026-10-19T09:10:47.192Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:10:47.192Z" }, "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", "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" } ] } ] } ], "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" } } } }