530 lines
25 KiB
JSON
530 lines
25 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21765",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-29T08:45:45.761Z",
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"datePublished": "2025-02-27T02:18:16.078Z",
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"dateUpdated": "2026-11-10T12:34:59.868Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:54:18.497Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: use RCU protection in ip6_default_advmss()\n\nip6_default_advmss() needs rcu protection to make\nsure the net structure it reads does not disappear."
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}
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{
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"baseScore": 8.1,
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},
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{
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"lang": "en",
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"value": "AV:N - `ip6_default_advmss()` is reached from the inbound IPv6 TCP handshake — `tcp_v6_rcv()` → `tcp_conn_request()` → `tcp_openreq_init_rwin()` and `tcp_v6_send_synack()` → `tcp_make_synack()` — so an unauthenticated remote peer sending a TCP SYN to any listening IPv6 socket executes the vulnerable read. No local access is needed.\nAC:H - The use-after-free only materialises if the `struct net` obtained from `dev_net(dst->dev)` is concurrently torn down (netns dismantle or `dev_change_net_namespace()`), a condition a remote attacker cannot influence, and the unprotected window between the pointer load and the `ip6_rt_min_advmss` dereference is narrow.\nPR:N - There is no privilege, capability or authentication check anywhere on the path; the code runs in softirq during SYN processing before any connection is established or credentials exchanged.\nUI:N - The attacker triggers the path entirely by transmitting packets to a listening IPv6 port; no action by a local user or victim process is required.\nS:U - The stale `struct net` dereference is confined to the kernel's own networking stack on the same host, crossing no virtualization, IOMMU or other security-authority boundary.\nC:H - This is a use-after-free read of a freed `net_cachep` slab object, and the recovered value directly influences the MSS advertised in the SYN-ACK, exposing reallocated kernel heap contents to the remote peer as an oracle.\nI:H - Reuse of a freed `struct net` means kernel state is derived from attacker-groomable reallocated slab memory; per UAF scoring guidance such object reuse is treated as corruption exploitable for further modification of kernel state.\nA:H - Dereferencing a `struct net` that has already been returned to the slab allocator can fault or read garbage, producing a KASAN splat, oops or panic in the TCP receive softirq path, and the trigger is repeatable with ordinary inbound connections."
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}
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|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.5",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
},
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.6",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
},
|
|
{
|
|
"vendor": "Siemens",
|
|
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)",
|
|
"versions": [
|
|
{
|
|
"status": "affected",
|
|
"version": "V3.1.7",
|
|
"lessThan": "*",
|
|
"versionType": "custom"
|
|
}
|
|
],
|
|
"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |