CVE-2026-97920
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Keep the entry count when the histogram stats allocation fails print_entries() uses n_entries both as the number of sort entries and as its own return value, so the -ENOMEM it stores when the stats allocation fails overwrites the count that the cleanup still needs: n_entries = tracing_map_sort_entries(map, ...); if (n_entries < 0) return n_entries; ... if (!stats) { n_entries = -ENOMEM; goto out; } ... out: tracing_map_destroy_sort_entries(sort_entries, n_entries); tracing_map_destroy_sort_entries() takes an unsigned int and loops up to it, so -ENOMEM arrives as 4294967284. It walks an array of at most map->max_elts pointers and calls destroy_sort_entry(), which dereferences and frees, on whatever lies past the end. Reading the hist file of a trigger with a .percent value, with that allocation forced to fail: BUG: KASAN: vmalloc-out-of-bounds in tracing_map_destroy_sort_entries+0xa0/0xb0 Read of size 8 at addr ffffc90000045000 by task init/1 tracing_map_destroy_sort_entries+0xa0/0xb0 hist_show+0x6f7/0x1df0 seq_read_iter+0x2b8/0x1190 vfs_read+0x176/0xa40 The buggy address belongs to a 4-page vmalloc region starting at ffffc90000041000 allocated at tracing_map_sort_entries+0x5c/0xd50 A few pages further the fault is fatal. The registers at the oops confirm the bound: the loop's end pointer less the array start, over the pointer size, is 4294967284. Return the error in a separate variable and leave n_entries holding the count, the way tracing_map_sort_entries() does on its own error path. The stats block is only entered for a value carrying .percent or .graph, which __create_val_field() has rejected since v6.3, so this cannot be reached in mainline as it stands. It becomes reachable again with "tracing: hist: let values keep the percent and graph modifiers", so it should be applied first.
View original CVE JSON
{
"id": "CVE-2026-97920",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:19.037",
"lastModified": "2026-10-19T10:17:42.690",
"vulnStatus": "Received",
"cveTags": [],
"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": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "93454d1a306ea975294b861d32ffa1e44b20c733",
"lessThan": "89c978d67ad01ce28223944cc58e95feea177b35",
"versionType": "git",
"status": "affected"
},
{
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "fe05eeed27128e17d38dbc0af02e4470bcecda89",
"versionType": "git",
"status": "affected"
},
{
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "9bd8321f5370295d1ae96dd17d43be3c9edd441b",
"versionType": "git",
"status": "affected"
},
{
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "c80b2a8067d58ff7d268ceef781c68b37a16c321",
"versionType": "git",
"status": "affected"
},
{
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "17e87ce55f877efff1b08fe509e8bf91378cbbc9",
"versionType": "git",
"status": "affected"
},
{
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "06f5634ec5584954177f9a22e36b3bfb398a971b",
"versionType": "git",
"status": "affected"
},
{
"version": "6.1.23",
"lessThan": "6.1.189",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.2",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.2",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.111",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/89c978d67ad01ce28223944cc58e95feea177b35",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c80b2a8067d58ff7d268ceef781c68b37a16c321",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fe05eeed27128e17d38dbc0af02e4470bcecda89",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}