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net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Router Advertisements with user options the kernel builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct has three padding fields that are never zeroed and can leak kernel data The fix is simple, just zeroes the padding fields.

Announced Source revision 1
Original source ↗

CVE-2026-43040

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43040

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "11d7fe97421cfc81549940c20ed5ac9472d6db05",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "7f56d87e527bb5a13c3e8b0d5840cb6332822f6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "4f810c686fde509d1cdaa706322d9d2531f8f1a4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "b485eef3d97b7aae55ce669b6de555ec81f3d21c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "ef3645606e4a635d5062a492f22b7f490852ee67",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "31910575a9de61e78065e93846e8e7a4894a18bf",
        "lessThan": "ae05340ccaa9d347fe85415609e075545bec589f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/ndisc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.24"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.24",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.168",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.134",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/ndisc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43040

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28341 · Revision 1
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Publisher date
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