Vulnerability-Lookup

GHSA-59PC-R9MR-H2PV

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-08 21:31

Details

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.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43040"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-909"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:50Z",
    "severity": "HIGH"
  },
  "details": "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": "GHSA-59pc-r9mr-h2pv",
  "modified": "2026-05-08T21:31:20Z",
  "published": "2026-05-01T15:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43040"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43040 (GCVE-0-2026-43040)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-11 22:16

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1da9023f6b071a38e…
https://git.kernel.org/stable/c/2fe4d0ba690a69ad6…
https://git.kernel.org/stable/c/11d7fe97421cfc815…
https://git.kernel.org/stable/c/7f56d87e527bb5a13…
https://git.kernel.org/stable/c/4f810c686fde509d1…
https://git.kernel.org/stable/c/b485eef3d97b7aae5…
https://git.kernel.org/stable/c/ef3645606e4a635d5…
https://git.kernel.org/stable/c/ae05340ccaa9d347f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < 11d7fe97421cfc81549940c20ed5ac9472d6db05 (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < 4f810c686fde509d1cdaa706322d9d2531f8f1a4 (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < b485eef3d97b7aae55ce669b6de555ec81f3d21c (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < ef3645606e4a635d5062a492f22b7f490852ee67 (git) Affected: 31910575a9de61e78065e93846e8e7a4894a18bf , < ae05340ccaa9d347fe85415609e075545bec589f (git)
Linux	Linux	Affected: 2.6.24 Unaffected: 0 , < 2.6.24 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
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        {
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          "programFiles": [
            "net/ipv6/ndisc.c"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.18.22",
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              "status": "unaffected",
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            },
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          "url": "https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f"
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    "dateReserved": "2026-05-01T14:12:55.978Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-59PC-R9MR-H2PV

CVE-2026-43040 (GCVE-0-2026-43040)

Tags

Sightings

Nomenclature