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CVE-2025-40126 (GCVE-0-2025-40126)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-23 16:01
VLAI
Title
sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC
Summary
In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 0bf3dc3a2156f1c5ddaba4b85d09767874634114 (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 41c18baee66134e6ef786eb075c1b6adb22432b0 (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 59424dc0d0e044b2eb007686a4724ddd91d57db5 (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 9b137f277cc3297044aabd950f589e505d30104c (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 674ff598148a28bae0b5372339de56f2abf0b1d1 (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 7de3a75bbc8465d816336c74d50109e73501efab (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 57c278500fce3cd4e1c540700c0b05426a958393 (git)
Affected: cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada , < 4fba1713001195e59cfc001ff1f2837dab877efb (git)
Affected: 1731d90d8a558ecb20cdee0c2c001ae8e15c251d (git)
Affected: b0580eadc19ff3a617a7d07cfaf2a985153c114e (git)
Affected: 4.4.34 , < 4.5 (semver)
Affected: 4.8.10 , < 4.9 (semver)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC\n\nThe referenced commit introduced exception handlers on user-space memory\nreferences in copy_from_user and copy_to_user. These handlers return from\nthe respective function and calculate the remaining bytes left to copy\nusing the current register contents. This commit fixes a couple of bad\ncalculations. This will fix the return value of copy_from_user and\ncopy_to_user in the faulting case. The behaviour of memcpy stays unchanged."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40126",
    "datePublished": "2025-11-12T10:23:20.460Z",
    "dateReserved": "2025-04-16T07:20:57.169Z",
    "dateUpdated": "2026-05-23T16:01:29.763Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:14:09+00:00",
      "cve": "CVE-2025-40126",
      "id": "CVE-2025-40126",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40126.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:49:01Z",
      "cve": "CVE-2025-40126",
      "id": "CVE-2025-40126",
      "initial_release_date": "2025-11-13T00:24:18Z",
      "product_status:known_not_affected": "546",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40126",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40126.json",
      "version": "18"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • 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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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


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