{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43040","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:55.978Z","datePublished":"2026-05-01T14:15:37.364Z","dateUpdated":"2026-05-11T22:16:33.369Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:16:33.369Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak\n\nWhen processing Router Advertisements with user options the kernel\nbuilds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct\nhas three padding fields that are never zeroed and can leak kernel data\n\nThe fix is simple, just zeroes the padding fields."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ndisc.c"],"versions":[{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"11d7fe97421cfc81549940c20ed5ac9472d6db05","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"7f56d87e527bb5a13c3e8b0d5840cb6332822f6d","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"4f810c686fde509d1cdaa706322d9d2531f8f1a4","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"b485eef3d97b7aae55ce669b6de555ec81f3d21c","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"ef3645606e4a635d5062a492f22b7f490852ee67","status":"affected","versionType":"git"},{"version":"31910575a9de61e78065e93846e8e7a4894a18bf","lessThan":"ae05340ccaa9d347fe85415609e075545bec589f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ndisc.c"],"versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.134","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c"},{"url":"https://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648"},{"url":"https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05"},{"url":"https://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d"},{"url":"https://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4"},{"url":"https://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c"},{"url":"https://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67"},{"url":"https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f"}],"title":"net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak","x_generator":{"engine":"bippy-1.2.0"}}}}