CVE-2026-90272 (GCVE-0-2026-90272)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
perf: arm_pmuv3: Zero initialize hw_id branch stack field
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: arm_pmuv3: Zero initialize hw_id branch stack field PERF_SAMPLE_BRANCH_HW_INDEX is supported by BRBE so hw_id is passed to userspace, but it's never set by the BRBE driver. Zero initialize it as it should be according to the docs: * For the architectures whose raw branch records are * already stored in age order, the hw_idx should be 0. It's probably too risky to remove PERF_SAMPLE_BRANCH_HW_INDEX from BRBE now in case anyone is setting it and reading the value, but zero initializing the whole struct also protects against the same issue with new fields that are added in the future.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f , < 57b72442c1672963fd51ab441ca1b71f6dc79b66 (git)
Affected: 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f , < 988e11b69ef9d4034e19c64407030fa948580c3d (git)
Affected: 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f , < 7c3b63386c27bed8d59a4b4c283d02860420eb0a (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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        }
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    "dateReserved": "2026-09-11T19:38:34.797Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: arm_pmuv3: Zero initialize hw_id branch stack field\n\nPERF_SAMPLE_BRANCH_HW_INDEX is supported by BRBE so hw_id is passed to\nuserspace, but it\u0027s never set by the BRBE driver. Zero initialize it as\nit should be according to the docs:\n\n   * For the architectures whose raw branch records are\n   * already stored in age order, the hw_idx should be 0.\n\nIt\u0027s probably too risky to remove PERF_SAMPLE_BRANCH_HW_INDEX from BRBE\nnow in case anyone is setting it and reading the value, but zero\ninitializing the whole struct also protects against the same issue with\nnew fields that are added in the future."
          }
        ],
        "id": "CVE-2026-90272",
        "lastModified": "2026-09-17T17:17:23.773",
        "metrics": {},
        "published": "2026-09-17T17:17:23.773",
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      "id": "CVE-2026-90272",
      "initial_release_date": "2026-09-21T16:29:17Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90272",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90272.json",
      "version": "2"
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}



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Nomenclature

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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