{"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": "2026-05-01T14:15:37.364Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T14:15:37.364Z"}, "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"}}}}

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{"cveTags": [], "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."}], "id": "CVE-2026-43040", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:50.130", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak", "id": "2464354", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464354"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-909", "details": ["A flaw was found in the Linux kernel. When processing Router Advertisements with user options, the `nduseroptmsg` structure's padding fields are not properly zeroed. This oversight can lead to an information leak, potentially exposing sensitive kernel data. A remote attacker could exploit this to gain unauthorized access to system information."], "name": "CVE-2026-43040", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43040\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43040\nhttps://lore.kernel.org/linux-cve-announce/2026050103-CVE-2026-43040-8fa0@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,11d7fe97421cfc81549940c20ed5ac9472d6db05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,7f56d87e527bb5a13c3e8b0d5840cb6332822f6d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,4f810c686fde509d1cdaa706322d9d2531f8f1a4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,b485eef3d97b7aae55ce669b6de555ec81f3d21c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,ef3645606e4a635d5062a492f22b7f490852ee67)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[31910575a9de61e78065e93846e8e7a4894a18bf,ae05340ccaa9d347fe85415609e075545bec589f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.24"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.24)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.168,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.134,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.81,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.22,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.12,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-01T18:45:15.320917+00:00", "updated": "2026-05-01T23:15:29.805725+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}