Vulnerability-Lookup

GHSA-CF8W-8G67-48GV

Vulnerability from github – Published: 2026-04-06 09:31 – Updated: 2026-04-06 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: conntrack: add missing netlink policy validations

Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.

These attributes are used by the kernel without any validation. Extend the netlink policies accordingly.

Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..]

and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31407"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-06T08:16:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n  nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n  value directly to ct-\u003eproto.sctp.state without checking that it is\n  within the valid range. [..]\n\n  and: ... with exp-\u003edir = 100, the access at\n  ct-\u003emaster-\u003etuplehash[100] reads 5600 bytes past the start of a\n  320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n  UBSAN.",
  "id": "GHSA-cf8w-8g67-48gv",
  "modified": "2026-04-06T09:31:42Z",
  "published": "2026-04-06T09:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31407"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31407 (GCVE-0-2026-31407)

Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-04-06 07:38

Title

netfilter: conntrack: add missing netlink policy validations

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/0fbae1e74493d5a16…
	https://git.kernel.org/stable/c/f900e1d77ee0ef87b…

Impacted products

Vendor

Product

Version

Linux

Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < 0fbae1e74493d5a160a70c51aeba035d8266ea7d (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 (git)

Linux

Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc5 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_netlink.c",
            "net/netfilter/nf_conntrack_proto_sctp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0fbae1e74493d5a160a70c51aeba035d8266ea7d",
              "status": "affected",
              "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
              "versionType": "git"
            },
            {
              "lessThan": "f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05",
              "status": "affected",
              "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_netlink.c",
            "net/netfilter/nf_conntrack_proto_sctp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "lessThan": "2.6.27",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "7.0-rc5",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n  nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n  value directly to ct-\u003eproto.sctp.state without checking that it is\n  within the valid range. [..]\n\n  and: ... with exp-\u003edir = 100, the access at\n  ct-\u003emaster-\u003etuplehash[100] reads 5600 bytes past the start of a\n  320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n  UBSAN."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-06T07:38:19.712Z",
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        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"
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          "url": "https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"
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      "title": "netfilter: conntrack: add missing netlink policy validations",
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    "assignerShortName": "Linux",
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    "datePublished": "2026-04-06T07:38:19.712Z",
    "dateReserved": "2026-03-09T15:48:24.086Z",
    "dateUpdated": "2026-04-06T07:38:19.712Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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-CF8W-8G67-48GV

CVE-2026-31407 (GCVE-0-2026-31407)

Tags

Sightings

Nomenclature