CVE-2026-31407 (GCVE-0-2026-31407)
Vulnerability from cvelistv5
Published
2026-04-06 07:38
Modified
2026-10-19 18:35
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
Version: a258860e01b80e8f554a4ab1a6c95e6042eb8b73
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    "datePublished": "2026-04-06T07:38:19.712Z",
    "dateReserved": "2026-03-09T15:48:24.086Z",
    "dateUpdated": "2026-10-19T18:35:47.097Z",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_netlink.c\", \"net/netfilter/nf_conntrack_proto_sctp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.27\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.27\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.136\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_netlink.c\", \"net/netfilter/nf_conntrack_proto_sctp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c\"}, {\"url\": \"https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70\"}, {\"url\": \"https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe\"}, {\"url\": \"https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c\"}, {\"url\": \"https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443\"}, {\"url\": \"https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e\"}, {\"url\": \"https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d\"}, {\"url\": \"https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.136\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.83\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.24\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.10\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:22:16.533Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31407\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:35:47.097Z\", \"dateReserved\": \"2026-03-09T15:48:24.086Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-06T07:38:19.712Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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