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vuln-cve/data/2026/31xxx/CVE-2026-31427.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-31427",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-03-09T15:48:24.088Z",
"datePublished": "2026-04-13T13:40:30.280Z",
"dateUpdated": "2026-11-10T12:44:14.313Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T22:08:29.865Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp\n\nprocess_sdp() declares union nf_inet_addr rtp_addr on the stack and\npasses it to the nf_nat_sip sdp_session hook after walking the SDP\nmedia descriptions. However rtp_addr is only initialized inside the\nmedia loop when a recognized media type with a non-zero port is found.\n\nIf the SDP body contains no m= lines, only inactive media sections\n(m=audio 0 ...) or only unrecognized media types, rtp_addr is never\nassigned. Despite that, the function still calls hooks->sdp_session()\nwith &rtp_addr, causing nf_nat_sdp_session() to format the stale stack\nvalue as an IP address and rewrite the SDP session owner and connection\nlines with it.\n\nWith CONFIG_INIT_STACK_ALL_ZERO (default on most distributions) this\nresults in the session-level o= and c= addresses being rewritten to\n0.0.0.0 for inactive SDP sessions. Without stack auto-init the\nrewritten address is whatever happened to be on the stack.\n\nFix this by pre-initializing rtp_addr from the session-level connection\naddress (caddr) when available, and tracking via a have_rtp_addr flag\nwhether any valid address was established. Skip the sdp_session hook\nentirely when no valid address exists."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_conntrack_sip.c"
],
"versions": [
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "faa6ea32797a1847790514ff0da1be1d09771580",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "82baeb871e8f04906bc886273fdf0209e1754eb3",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "6e5e3c87b7e6212f1d8414fc2e4d158b01e12025",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "7edca70751b9bdb5b83eed53cde21eccf3c86147",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "01f34a80ac23ae90b1909b94b4ed05343a62f646",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "52fdda318ef2362fc5936385bcb8b3d0328ee629",
"status": "affected",
"versionType": "git"
},
{
"version": "4ab9e64e5e3c0516577818804aaf13a630d67bc9",
"lessThan": "6a2b724460cb67caed500c508c2ae5cf012e4db4",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_conntrack_sip.c"
],
"versions": [
{
"version": "2.6.26",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.26",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.253",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.203",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.168",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.131",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.80",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.21",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.11",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "5.10.253"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "5.15.203"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.1.168"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.6.131"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.12.80"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.18.21"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "6.19.11"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "7.0"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/faa6ea32797a1847790514ff0da1be1d09771580"
},
{
"url": "https://git.kernel.org/stable/c/82baeb871e8f04906bc886273fdf0209e1754eb3"
},
{
"url": "https://git.kernel.org/stable/c/6e5e3c87b7e6212f1d8414fc2e4d158b01e12025"
},
{
"url": "https://git.kernel.org/stable/c/fe463e76c9b4b0b43b5ee8961b4c500231f1a3f6"
},
{
"url": "https://git.kernel.org/stable/c/7edca70751b9bdb5b83eed53cde21eccf3c86147"
},
{
"url": "https://git.kernel.org/stable/c/01f34a80ac23ae90b1909b94b4ed05343a62f646"
},
{
"url": "https://git.kernel.org/stable/c/52fdda318ef2362fc5936385bcb8b3d0328ee629"
},
{
"url": "https://git.kernel.org/stable/c/6a2b724460cb67caed500c508c2ae5cf012e4db4"
}
],
"title": "netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-11-10T12:44:14.313Z"
},
"affected": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
{
"status": "affected",
"version": "V3.1.5",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
{
"status": "affected",
"version": "V3.1.7",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)",
"versions": [
{
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"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
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}
],
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{
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)",
"versions": [
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],
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{
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{
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"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
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{
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{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
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},
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-31427",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-11-05T21:33:05.862569Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-05T21:33:51.004Z"
}
}
]
}
}
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