{"id":"CVE-2026-97920","title":"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, …","summary":"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, …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-125"],"vendor":"Linux","product":"Linux","affected":["Linux >= 93454d1a306ea975294b861d32ffa1e44b20c733 < 89c978d67ad01ce28223944cc58e95feea177b35","Linux >= abaa5258ce5e5887a9de049f50a85dc023391a1c < fe05eeed27128e17d38dbc0af02e4470bcecda89","Linux >= abaa5258ce5e5887a9de049f50a85dc023391a1c < 9bd8321f5370295d1ae96dd17d43be3c9edd441b","Linux >= abaa5258ce5e5887a9de049f50a85dc023391a1c < c80b2a8067d58ff7d268ceef781c68b37a16c321","Linux >= abaa5258ce5e5887a9de049f50a85dc023391a1c < 17e87ce55f877efff1b08fe509e8bf91378cbbc9","Linux >= abaa5258ce5e5887a9de049f50a85dc023391a1c < 06f5634ec5584954177f9a22e36b3bfb398a971b","Linux >= 6.1.23 < 6.1.189","Linux 6.2"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:09.677","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97920","references":[{"url":"https://git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/89c978d67ad01ce28223944cc58e95feea177b35","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c80b2a8067d58ff7d268ceef781c68b37a16c321","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fe05eeed27128e17d38dbc0af02e4470bcecda89","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97920.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97920"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541107"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97920"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97920"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97920.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10516,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.888Z","slug":"CVE-2026-97920","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97920.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":213477,"id":"CVE-2026-97920","ts":1790754735959,"field":"cvss","old":null,"new":"5.5"},{"seq":213476,"id":"CVE-2026-97920","ts":1790754735959,"field":"severity","old":"none","new":"medium"}]}