CVE-2026-89765

timers/itimer: Zero-init old itimerval before copy to userspace

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6d4b937251386d9c6f968e7802f0cb16a8523772Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4ea70146ab9376092297eb8b622ef1792797f2cfAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a17b345daff46fec4af9f1ecbdf350208016dd15Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bdfda99c5763822a9a888e8af0ad7d9312ffcfe2Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25eAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 00ef529a5402f41eb1d227916437e237450719f9Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6d4b937251386d9c6f968e7802f0cb16a8523772Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4ea70146ab9376092297eb8b622ef1792797f2cfAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a17b345daff46fec4af9f1ecbdf350208016dd15Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bdfda99c5763822a9a888e8af0ad7d9312ffcfe2Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25eAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 00ef529a5402f41eb1d227916437e237450719f9Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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