CVE-2026-89765 (GCVE-0-2026-89765)
Vulnerability from cvelistv5
Published
2026-09-11 19:47
Modified
2026-10-19 08:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: timers/itimer: Zero-init old itimerval before copy to userspace On native sparc64, struct __kernel_old_timeval contains a four-byte hole after tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit. put_itimerval() fills only the named fields in a stack-allocated __kernel_old_itimerval and copies the entire object to userspace, so getitimer() can expose the two padding holes. Zero-initialize the aggregate before assigning the fields so implicit padding is deterministic before it crosses the user/kernel boundary.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/time/itimer.c"
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          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
        {
          "nodes": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntimers/itimer: Zero-init old itimerval before copy to userspace\n\nOn native sparc64, struct __kernel_old_timeval contains a four-byte hole\nafter tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit.\nput_itimerval() fills only the named fields in a stack-allocated\n__kernel_old_itimerval and copies the entire object to userspace, so\ngetitimer() can expose the two padding holes.\n\nZero-initialize the aggregate before assigning the fields so implicit\npadding is deterministic before it crosses the user/kernel boundary."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:18.849Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2"
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          "url": "https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4"
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          "url": "https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e"
        },
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          "url": "https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8"
        }
      ],
      "title": "timers/itimer: Zero-init old itimerval before copy to userspace",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89765",
    "datePublished": "2026-09-11T19:47:05.851Z",
    "dateReserved": "2026-09-11T19:38:34.764Z",
    "dateUpdated": "2026-10-19T08:52:18.849Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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