CVE-2026-97920 (GCVE-0-2026-97920)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-09-25 10:22
VLAI
Title
tracing: Keep the entry count when the histogram stats allocation fails
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: abaa5258ce5e5887a9de049f50a85dc023391a1c , < 9bd8321f5370295d1ae96dd17d43be3c9edd441b (git)
Affected: abaa5258ce5e5887a9de049f50a85dc023391a1c , < c80b2a8067d58ff7d268ceef781c68b37a16c321 (git)
Affected: abaa5258ce5e5887a9de049f50a85dc023391a1c , < 17e87ce55f877efff1b08fe509e8bf91378cbbc9 (git)
Affected: abaa5258ce5e5887a9de049f50a85dc023391a1c , < 06f5634ec5584954177f9a22e36b3bfb398a971b (git)
Affected: 93454d1a306ea975294b861d32ffa1e44b20c733 (git)
Affected: 6.1.23 , < 6.2 (semver)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "version": "6.1.23",
              "versionType": "semver"
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          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.2"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc3",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.23",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u003c 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-\u003emax_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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:22:40.431Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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",
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97920",
    "datePublished": "2026-09-25T10:22:40.431Z",
    "dateReserved": "2026-09-25T10:18:58.202Z",
    "dateUpdated": "2026-09-25T10:22:40.431Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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    "epss": {
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      "date": "2026-09-29",
      "epss": "0.002",
      "percentile": "0.08812"
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      "id": "msrc_CVE-2026-97920",
      "initial_release_date": "2026-09-28T00:01:14.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tracing: Keep the entry count when the histogram stats allocation fails",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97920.json",
      "version": "1"
    },
    "nvd": {
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                "defaultStatus": "unaffected",
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                "programFiles": [
                  "kernel/trace/trace_events_hist.c"
                ],
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                "vendor": "Linux",
                "versions": [
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                    "version": "6.2"
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                  {
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                    "versionType": "semver"
                  },
                  {
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        "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 \u003c 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-\u003emax_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\u0027s 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."
          }
        ],
        "id": "CVE-2026-97920",
        "lastModified": "2026-09-25T11:17:19.037",
        "metrics": {},
        "published": "2026-09-25T11:17:19.037",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9"
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            "url": "https://git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-29T19:27:24+00:00",
      "cve": "CVE-2026-97920",
      "id": "CVE-2026-97920",
      "initial_release_date": "2026-09-25T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Keep the entry count when the histogram stats allocation fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97920.json",
      "version": "3"
    }
  }
}



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