{"id":"CVE-2026-89765","state":"PUBLISHED","title":"timers/itimer: Zero-init old itimerval before copy to userspace","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntimers/itimer: Zero-init old itimerval before copy to userspace\n\nOn native sparc64, struct __kernel_old_timeval contains a four-byte hole\nafter tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit.\nput_itimerval() fills only the named fields in a stack-allocated\n__kernel_old_itimerval and copies the entire object to userspace, so\ngetitimer() can expose the two padding holes.\n\nZero-initialize the aggregate before assigning the fields so implicit\npadding is deterministic before it crosses the user/kernel boundary.","publishedAt":"2026-09-11T19:47:05.851Z","updatedAt":"2026-10-19T08:52:18.849Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6d4b937251386d9c6f968e7802f0cb16a8523772","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4ea70146ab9376092297eb8b622ef1792797f2cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a17b345daff46fec4af9f1ecbdf350208016dd15","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"bdfda99c5763822a9a888e8af0ad7d9312ffcfe2","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"00ef529a5402f41eb1d227916437e237450719f9","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/itimer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/itimer.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89765.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89765","state":"PUBLISHED","datePublished":"2026-09-11T19:47:05.851Z","dateUpdated":"2026-10-19T08:52:18.849Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.764Z"},"containers":{"cna":{"title":"timers/itimer: Zero-init old itimerval before copy to userspace","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntimers/itimer: Zero-init old itimerval before copy to userspace\n\nOn native sparc64, struct __kernel_old_timeval contains a four-byte hole\nafter tv_usec because tv_sec is 64-bit while __kernel_suseconds_t is 32-bit.\nput_itimerval() fills only the named fields in a stack-allocated\n__kernel_old_itimerval and copies the entire object to userspace, so\ngetitimer() can expose the two padding holes.\n\nZero-initialize the aggregate before assigning the fields so implicit\npadding is deterministic before it crosses the user/kernel boundary."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6d4b937251386d9c6f968e7802f0cb16a8523772","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4ea70146ab9376092297eb8b622ef1792797f2cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a17b345daff46fec4af9f1ecbdf350208016dd15","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"bdfda99c5763822a9a888e8af0ad7d9312ffcfe2","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"00ef529a5402f41eb1d227916437e237450719f9","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/itimer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/itimer.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772"},{"url":"https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf"},{"url":"https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15"},{"url":"https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2"},{"url":"https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4"},{"url":"https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e"},{"url":"https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9"},{"url":"https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:52:18.849Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}