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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:47 – Updated: 2026-09-14 12:02
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
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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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    "datePublished": "2026-09-11T19:47:05.851Z",
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        "metrics": {},
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      "cve": "CVE-2026-89765",
      "id": "CVE-2026-89765",
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      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Kernel: Information disclosure in timers/itimer due to uninitialized padding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89765.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T16:56:17Z",
      "cve": "CVE-2026-89765",
      "id": "CVE-2026-89765",
      "initial_release_date": "2026-09-12T16:21:56Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89765",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89765.json",
      "version": "3"
    }
  }
}



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