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

Vulnerability from cvelistv5 – Published: 2026-04-06 07:38 – Updated: 2026-08-05 12:22
VLAI
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
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < e7b5766693477c52424cc6c79dd30a7a9c7db52c (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < 78bba9f73942aa7dca47d817d8cec0fb9b443b70 (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < be88a337bf07afb1ee173f1099294d1b7ab3fefe (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < c5e918390002edf0cff80a0e7ce1f86f16a9507c (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < 9174d28f3f15d8c4962f5980c0be167633880443 (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < 67c53c1978cef3c504237275e39c857e2f6af56e (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < 0fbae1e74493d5a160a70c51aeba035d8266ea7d (git)
Affected: a258860e01b80e8f554a4ab1a6c95e6042eb8b73 , < f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:L - Reachability is through NETLINK_NETFILTER ctnetlink messages sent by a local process. Later packet processing can trigger the bad state or expectation, but the attacker must first inject the malformed conntrack/expectation attributes locally.\nAC:L - The bug is triggered with crafted netlink attributes and does not require winning a race. The attacker can create the relevant conntrack/expectation state and matching traffic in a controlled network namespace.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket\u0027s network namespace. Because this capability is reachable via user and network namespaces on affected deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can send the netlink request. The attacker can trigger the vulnerable paths directly.\nS:U - The impact remains within the kernel security authority. This is not a VM escape or cross-authority boundary bypass.\nC:H - The missing validation permits attacker-controlled out-of-bounds reads, including indexing beyond the master nf_conn tuplehash and SCTP state tables. This is not strictly bounded to a harmless few bytes, so high confidentiality impact is defensible.\nI:N - The investigated paths show out-of-bounds reads and invalid in-object state assignment, not an out-of-bounds write or control-flow overwrite. No direct integrity-impacting primitive was identified.\nA:H - The out-of-bounds reads are attacker-triggerable and were reported as UBSAN-confirmed slab out-of-bounds accesses. Such kernel faults can produce an oops or panic, so availability impact is high."
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      "cve": "CVE-2026-31407",
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[..]\\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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nnetfilter: conntrack: a\u00f1adir validaciones de pol\u00edticas netlink faltantes\\n\\nHyunwoo Kim informa de acceso fuera de l\u00edmites en sctp y ctnetlink.\\n\\nEstos atributos son utilizados por el kernel sin ninguna validaci\u00f3n.\\nExtender las pol\u00edticas netlink en consecuencia.\\n\\nCitando al informante:\\n  \u0027nlattr_to_sctp() asigna el valor CTA_PROTOINFO_SCTP_STATE proporcionado por el usuario\\n  directamente a ct -\u003e proto.sctp.state sin comprobar que est\u00e9\\n  dentro del rango v\u00e1lido. [..]\\n\\n  y: ... con exp -\u003e dir = 100, el acceso en\\n  ct -\u003e master -\u003e tuplehash[100] lee 5600 bytes m\u00e1s all\u00e1 del inicio de un\\n  objeto nf_conn de 320 bytes, causando una lectura fuera de l\u00edmites de slab confirmada por\\n  UBSAN.\u0027\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"e7b5766693477c52424cc6c79dd30a7a9c7db52c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"78bba9f73942aa7dca47d817d8cec0fb9b443b70\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"be88a337bf07afb1ee173f1099294d1b7ab3fefe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"c5e918390002edf0cff80a0e7ce1f86f16a9507c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"9174d28f3f15d8c4962f5980c0be167633880443\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"67c53c1978cef3c504237275e39c857e2f6af56e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"0fbae1e74493d5a160a70c51aeba035d8266ea7d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a258860e01b80e8f554a4ab1a6c95e6042eb8b73\",\"lessThan\":\"f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"2.6.27\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.27\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.136\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.10\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.27\",\"versionEndExcluding\":\"6.6.136\",\"matchCriteriaId\":\"B3457033-D01A-43C8-836D-8E21A577B7A5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.10\",\"matchCriteriaId\":\"96D34333-38BE-4414-9E79-6EB764329581\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:46:50+00:00",
      "cve": "CVE-2026-31407",
      "id": "CVE-2026-31407",
      "initial_release_date": "2026-04-06T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: conntrack: add missing netlink policy validations",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31407.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-19T17:41:46Z",
      "cve": "CVE-2026-31407",
      "id": "CVE-2026-31407",
      "initial_release_date": "2026-04-06T23:25:07Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "212",
      "product_status:recommended": "325",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31407",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31407.json",
      "version": "17"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.