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.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 00ef529a5402f41eb1d227916437e237450719f9
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8
0 affected < 6.12.109
0 affected < 6.18.50
0 affected < 7.2.4
Linux Linux affected
Version Status Constraints
6.12.109 unaffected ≤ 6.12.*
6.18.50 unaffected ≤ 6.18.*
7.2.4 unaffected ≤ 7.2.*
7.3-rc1 unaffected ≤ *

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9 cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-89765 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-89765 cve-icon
History

Sat, 12 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-201
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H'}

threat_severity

Moderate

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
Description 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.
Title timers/itimer: Zero-init old itimerval before copy to userspace
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-11T19:47:05.851Z

Reserved: 2026-09-11T19:38:34.764Z

Link: CVE-2026-89765

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-11T20:20:07.740

Modified: 2026-09-11T20:20:07.740

Link: CVE-2026-89765

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-11T19:47:05Z

Links: CVE-2026-89765 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-12T06:00:11Z

Weaknesses