CVE-2026-89765
timers/itimer: Zero-init old itimerval before copy to userspace
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2026 |
| Last Updated | Sep 14, 2026 |
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Affected Versions
Linux / Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6d4b937251386d9c6f968e7802f0cb16a8523772 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4ea70146ab9376092297eb8b622ef1792797f2cf 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a17b345daff46fec4af9f1ecbdf350208016dd15 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < bdfda99c5763822a9a888e8af0ad7d9312ffcfe2 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 00ef529a5402f41eb1d227916437e237450719f9 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8
Linux / Linux
2.6.12
References
git.kernel.org: https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772 git.kernel.org: https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf git.kernel.org: https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15 git.kernel.org: https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2 git.kernel.org: https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 git.kernel.org: https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e git.kernel.org: https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9 git.kernel.org: https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8