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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89765
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:07 UTC
Updated2026-09-11 20:20:07 UTC
DescriptionIn 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 Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 00ef529a5402f41eb1d227916437e237450719f9 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 git Not specified
CNA Linux Linux affected 6.12.109 semver Not specified
CNA Linux Linux affected 6.18.50 semver Not specified
CNA Linux Linux affected 7.2.4 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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