CVE-2026-58084 (GCVE-0-2026-58084)

Vulnerability from cvelistv5 – Published: 2026-08-19 07:31 – Updated: 2026-08-19 07:31
VLAI
Title
Kernel stack disclosure via timer_settime(2)
Summary
To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace. An unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data.
Severity
No CVSS data available.
CWE
  • CWE-908 - Use of Uninitialized Resource
Assigner
References
Impacted products
Vendor Product Version CPE status
FreeBSD FreeBSD Affected: 15.1-RELEASE , < p2 (release)
Affected: 15.0-RELEASE , < p12 (release)
guessed Create a notification for this product.
Date Public
2026-07-29 22:40
Credits
Hazley Samsudin of GovTech CSG
Show details on NVD website
To clipboard 

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          "modules": [
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          "vendor": "FreeBSD",
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              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
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              "status": "affected",
              "version": "15.0-RELEASE",
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            }
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Hazley Samsudin of GovTech CSG"
        }
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      "datePublic": "2026-07-29T22:40:00.000Z",
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          "value": "To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer\u0027s clock.  For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace.\n\nAn unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908: Use of Uninitialized Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T07:31:42.001Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
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          "tags": [
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          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:51.ktimer.asc"
        }
      ],
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    "cveId": "CVE-2026-58084",
    "datePublished": "2026-08-19T07:31:42.001Z",
    "dateReserved": "2026-06-29T01:40:17.498Z",
    "dateUpdated": "2026-08-19T07:31:42.001Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-08-19",
      "epss": "0.00182",
      "percentile": "0.08077"
    },
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  }
}



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