CVE-2026-53370 (GCVE-0-2026-53370)

Vulnerability from cvelistv5 – Published: 2026-07-19 09:10 – Updated: 2026-07-19 09:10
VLAI
Title
perf/x86/intel: Improve validation and configuration of ACR masks
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Improve validation and configuration of ACR masks Currently there are several issues on the user space ACR mask validation and configuration. - The validation for user space ACR mask (attr.config2) is incomplete, e.g., the ACR mask could include the index which belongs to another ACR events group, but it's not validated. - An early return on an invalid ACR mask caused all subsequent ACR groups to be skipped. - The stale hardware ACR mask (hw.config1) is not cleared before setting new hardware ACR mask. The following changes address all of the above issues. - Figure out the event index group of an ACR group. Any bits in the user-space mask not present in the index group are now dropped. - Instead of an early return on invalid bits, drop only the invalid portions and continue iterating through all ACR events to ensure full configuration. - Explicitly clear the stale hardware ACR mask for each event prior to writing the new configuration. Besides, a non-leader event member of ACR group could be disabled in theory. This could cause bit-shifting errors in the acr_mask of remaining group members. But since ACR sampling requires all events to be active, this should not be a big concern in real use case. Add a "FIXME" comment to notice this risk.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ec980e4facef8110f6fce27e5b6344660117f01f , < aab56b95bee3ff79176b13443cd9d7cfe9747df0 (git)
Affected: ec980e4facef8110f6fce27e5b6344660117f01f , < c05e01cef47d9b4969eae2dcf9467e2a555bcb4f (git)
Affected: ec980e4facef8110f6fce27e5b6344660117f01f , < 5ad732a56be46aabf158c16aa0c095291727aaef (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/events/intel/core.c"
          ],
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          "nodes": [
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Improve validation and configuration of ACR masks\n\nCurrently there are several issues on the user space ACR mask validation\nand configuration.\n- The validation for user space ACR mask (attr.config2) is incomplete,\n  e.g., the ACR mask could include the index which belongs to another\n  ACR events group, but it\u0027s not validated.\n- An early return on an invalid ACR mask caused all subsequent ACR groups\n  to be skipped.\n- The stale hardware ACR mask (hw.config1) is not cleared before setting\n  new hardware ACR mask.\n\nThe following changes address all of the above issues.\n- Figure out the event index group of an ACR group. Any bits in the\n  user-space mask not present in the index group are now dropped.\n- Instead of an early return on invalid bits, drop only the invalid\n  portions and continue iterating through all ACR events to ensure full\n  configuration.\n- Explicitly clear the stale hardware ACR mask for each event prior to\n  writing the new configuration.\n\nBesides, a non-leader event member of ACR group could be disabled in\ntheory. This could cause bit-shifting errors in the acr_mask of remaining\ngroup members. But since ACR sampling requires all events to be active,\nthis should not be a big concern in real use case. Add a \"FIXME\" comment\nto notice this risk."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T09:10:30.990Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef"
        }
      ],
      "title": "perf/x86/intel: Improve validation and configuration of ACR masks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53370",
    "datePublished": "2026-07-19T09:10:30.990Z",
    "dateReserved": "2026-06-09T07:44:35.401Z",
    "dateUpdated": "2026-07-19T09:10:30.990Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53370",
      "date": "2026-07-21",
      "epss": "0.00166",
      "percentile": "0.06266"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53370\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T09:17:02.153\",\"lastModified\":\"2026-07-19T09:17:02.153\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nperf/x86/intel: Improve validation and configuration of ACR masks\\n\\nCurrently there are several issues on the user space ACR mask validation\\nand configuration.\\n- The validation for user space ACR mask (attr.config2) is incomplete,\\n  e.g., the ACR mask could include the index which belongs to another\\n  ACR events group, but it\u0027s not validated.\\n- An early return on an invalid ACR mask caused all subsequent ACR groups\\n  to be skipped.\\n- The stale hardware ACR mask (hw.config1) is not cleared before setting\\n  new hardware ACR mask.\\n\\nThe following changes address all of the above issues.\\n- Figure out the event index group of an ACR group. Any bits in the\\n  user-space mask not present in the index group are now dropped.\\n- Instead of an early return on invalid bits, drop only the invalid\\n  portions and continue iterating through all ACR events to ensure full\\n  configuration.\\n- Explicitly clear the stale hardware ACR mask for each event prior to\\n  writing the new configuration.\\n\\nBesides, a non-leader event member of ACR group could be disabled in\\ntheory. This could cause bit-shifting errors in the acr_mask of remaining\\ngroup members. But since ACR sampling requires all events to be active,\\nthis should not be a big concern in real use case. Add a \\\"FIXME\\\" comment\\nto notice this risk.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/events/intel/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ec980e4facef8110f6fce27e5b6344660117f01f\",\"lessThan\":\"aab56b95bee3ff79176b13443cd9d7cfe9747df0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec980e4facef8110f6fce27e5b6344660117f01f\",\"lessThan\":\"c05e01cef47d9b4969eae2dcf9467e2a555bcb4f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ec980e4facef8110f6fce27e5b6344660117f01f\",\"lessThan\":\"5ad732a56be46aabf158c16aa0c095291727aaef\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/events/intel/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T08:04:19+00:00",
      "cve": "CVE-2026-53370",
      "id": "CVE-2026-53370",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf/x86/intel: Improve validation and configuration of ACR masks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53370.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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