# CVE-2026-89765

## Summary

- **CVE ID:** CVE-2026-89765
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## 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.

## Affected Products

- Linux — Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (2.6.12)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4)
- [CNA](https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e)
- [CNA](https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9)
- [CNA](https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8)
- [CNA](https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772)
- [CNA](https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf)
- [CNA](https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15)
- [CNA](https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 9.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._