Vulnerability-Lookup

GHSA-X38G-MR96-V378

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89765"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:07Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-x38g-mr96-v378",
  "modified": "2026-09-14T15:32:36Z",
  "published": "2026-09-11T21:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89765"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89765 (GCVE-0-2026-89765)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:47 – Updated: 2026-09-14 12:02

Title

timers/itimer: Zero-init old itimerval before copy to userspace

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/6d4b937251386d9c6…
https://git.kernel.org/stable/c/4ea70146ab9376092…
https://git.kernel.org/stable/c/a17b345daff46fec4…
https://git.kernel.org/stable/c/bdfda99c5763822a9…
https://git.kernel.org/stable/c/4c66719dd1e4023c5…
https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3b…
https://git.kernel.org/stable/c/00ef529a5402f41eb…
https://git.kernel.org/stable/c/18c7d85864e554adc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6d4b937251386d9c6f968e7802f0cb16a8523772 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4ea70146ab9376092297eb8b622ef1792797f2cf (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a17b345daff46fec4af9f1ecbdf350208016dd15 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bdfda99c5763822a9a888e8af0ad7d9312ffcfe2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 00ef529a5402f41eb1d227916437e237450719f9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/time/itimer.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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            {
              "lessThan": "4ea70146ab9376092297eb8b622ef1792797f2cf",
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
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            },
            {
              "lessThan": "2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e",
              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                },
                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.12",
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        }
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        {
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        }
      ],
      "title": "timers/itimer: Zero-init old itimerval before copy to userspace",
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    "datePublished": "2026-09-11T19:47:05.851Z",
    "dateReserved": "2026-09-11T19:38:34.764Z",
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}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-X38G-MR96-V378

CVE-2026-89765 (GCVE-0-2026-89765)

Tags

Sightings

Nomenclature