{"id":"CVE-2026-98935","state":"PUBLISHED","title":"rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak\n\nThe struct rtc_wkalrm has padding holes after the 'pending' member.\nWhen returned to userspace via the RTC_WKALRM_RD ioctl, uninitialized\nkernel stack data residing in these holes may be leaked.\n\nZero-initialize the struct at declaration to eliminate this information\nleak risk.\n\nFixes smatch warnings:\n- drivers/rtc/dev.c:392 rtc_dev_ioctl() warn: check that 'alarm' doesn't\n  leak information (struct has a hole after 'pending')","publishedAt":"2026-10-23T12:11:46.041Z","updatedAt":"2026-10-30T12:40:24.910Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"f84eb9b7b0feeb267a174237d70a857042ce0158","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"beda3c9730ad3087d01aa1d0415c40942042ec87","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"00dc50cede96738dadc64b20e671186cddb8a58d","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"2838d7bbb551861c25187dfb581ed6e7a56762e9","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"0ee5c5d804d592a8328a425b9274487d393d3a05","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rtc/dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","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":["drivers/rtc/dev.c"]}],"references":["https://git.kernel.org/stable/c/f84eb9b7b0feeb267a174237d70a857042ce0158","https://git.kernel.org/stable/c/a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb","https://git.kernel.org/stable/c/beda3c9730ad3087d01aa1d0415c40942042ec87","https://git.kernel.org/stable/c/00dc50cede96738dadc64b20e671186cddb8a58d","https://git.kernel.org/stable/c/2838d7bbb551861c25187dfb581ed6e7a56762e9","https://git.kernel.org/stable/c/0ee5c5d804d592a8328a425b9274487d393d3a05"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98935.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98935","state":"PUBLISHED","datePublished":"2026-10-23T12:11:46.041Z","dateUpdated":"2026-10-30T12:40:24.910Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.381Z"},"containers":{"cna":{"title":"rtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: dev: zero-initialize struct rtc_wkalrm to prevent information leak\n\nThe struct rtc_wkalrm has padding holes after the 'pending' member.\nWhen returned to userspace via the RTC_WKALRM_RD ioctl, uninitialized\nkernel stack data residing in these holes may be leaked.\n\nZero-initialize the struct at declaration to eliminate this information\nleak risk.\n\nFixes smatch warnings:\n- drivers/rtc/dev.c:392 rtc_dev_ioctl() warn: check that 'alarm' doesn't\n  leak information (struct has a hole after 'pending')"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"f84eb9b7b0feeb267a174237d70a857042ce0158","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"beda3c9730ad3087d01aa1d0415c40942042ec87","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"00dc50cede96738dadc64b20e671186cddb8a58d","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"2838d7bbb551861c25187dfb581ed6e7a56762e9","versionType":"git"},{"version":"36e14f5fdfdf7cec8887b7ff69cd9bb5051ecf62","status":"affected","lessThan":"0ee5c5d804d592a8328a425b9274487d393d3a05","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rtc/dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","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":["drivers/rtc/dev.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f84eb9b7b0feeb267a174237d70a857042ce0158"},{"url":"https://git.kernel.org/stable/c/a2215eb3cbbd3d9d73cc18c08e3ef53f903443cb"},{"url":"https://git.kernel.org/stable/c/beda3c9730ad3087d01aa1d0415c40942042ec87"},{"url":"https://git.kernel.org/stable/c/00dc50cede96738dadc64b20e671186cddb8a58d"},{"url":"https://git.kernel.org/stable/c/2838d7bbb551861c25187dfb581ed6e7a56762e9"},{"url":"https://git.kernel.org/stable/c/0ee5c5d804d592a8328a425b9274487d393d3a05"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:40:24.910Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}