CVE-2026-89765timers/itimer: Zero-init old itimerval before copy to userspace
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6d4b937251386d9c6f968e7802f0cb16a8523772; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4ea70146ab9376092297eb8b622ef1792797f2cf; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a17b345daff46fec4af9f1ecbdf350208016dd15; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before bdfda99c5763822a9a888e8af0ad7d9312ffcfe2; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 00ef529a5402f41eb1d227916437e237450719f9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 | CNA record |
References
- https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772
- https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf
- https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15
- https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2
- https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4
- https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e
- https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9
- https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.