CVE-2026-98935 (GCVE-0-2026-98935)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:11 – Updated: 2026-10-23 12:11
VLAI
Title
rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak
Summary
In the Linux kernel, the following vulnerability has been resolved: rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak The struct rtc_wkalrm has padding holes after the 'pending' member. When returned to userspace via the RTC_WKALRM_RD ioctl, uninitialized kernel stack data residing in these holes may be leaked. Zero-initialize the struct at declaration to eliminate this information leak risk. Fixes smatch warnings: - drivers/rtc/dev.c:392 rtc_dev_ioctl() warn: check that 'alarm' doesn't leak information (struct has a hole after 'pending')
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 , < a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb (git)
Affected: 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 , < beda3c9730ad3087d01aa1d0415c40942042ec87 (git)
Affected: 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 , < 00dc50cede96738dadc64b20e671186cddb8a58d (git)
Affected: 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 , < 2838d7bbb551861c25187dfb581ed6e7a56762e9 (git)
Affected: 36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62 , < 0ee5c5d804d592a8328a425b9274487d393d3a05 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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      "cpeApplicability": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak\n\nThe struct rtc_wkalrm has padding holes after the \u0027pending\u0027 member.\nWhen returned to userspace via the RTC_WKALRM_RD ioctl, uninitialized\nkernel stack data residing in these holes may be leaked.\n\nZero-initialize the struct at declaration to eliminate this information\nleak risk.\n\nFixes smatch warnings:\n- drivers/rtc/dev.c:392 rtc_dev_ioctl() warn: check that \u0027alarm\u0027 doesn\u0027t\n  leak information (struct has a hole after \u0027pending\u0027)"
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        "shortName": "Linux"
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    "datePublished": "2026-10-23T12:11:46.041Z",
    "dateReserved": "2026-09-25T10:25:14.381Z",
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      "product_status:under_investigation": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98935.json",
      "version": "2"
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          }
        ],
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        "lastModified": "2026-10-23T13:17:14.377",
        "metrics": {},
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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  }
}



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