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CVE-2026-89765

UnknownEPSS 0.19%

Last modified

CVE-2026-89765 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.19%

8.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6d4b937251386d9c6f968e7802f0cb16a8523772; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4ea70146ab9376092297eb8b622ef1792797f2cf; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a17b345daff46fec4af9f1ecbdf350208016dd15; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < bdfda99c5763822a9a888e8af0ad7d9312ffcfe2; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 00ef529a5402f41eb1d227916437e237450719f9; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89765?
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.
How severe is CVE-2026-89765?
Severity scoring for CVE-2026-89765 is pending analysis. The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89765?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST