492 lines
23 KiB
JSON
492 lines
23 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-27431",
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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": "2024-02-25T13:47:42.686Z",
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"datePublished": "2024-05-17T12:02:10.274Z",
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"dateUpdated": "2026-10-15T00:40:19.620Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:29:46.451Z"
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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\ncpumap: Zero-initialise xdp_rxq_info struct before running XDP program\n\nWhen running an XDP program that is attached to a cpumap entry, we don't\ninitialise the xdp_rxq_info data structure being used in the xdp_buff\nthat backs the XDP program invocation. Tobias noticed that this leads to\nrandom values being returned as the xdp_md->rx_queue_index value for XDP\nprograms running in a cpumap.\n\nThis means we're basically returning the contents of the uninitialised\nmemory, which is bad. Fix this by zero-initialising the rxq data\nstructure before running the XDP program."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Exploitation requires the attacker to load a BPF program and populate a CPUMAP entry via the local bpf() syscall, then attach XDP to a local netdev; network packets only serve as the trigger the attacker generates themselves. No remote peer can reach this code path.\nAC:L - The uninitialized read is deterministic on every cpumap XDP invocation, and the attacker fully controls the setup (own veth/MTU, own XDP program, own traffic), so it can be triggered repeatedly and reliably, including grooming the kthread stack residue across unlimited retries.\nPR:L - Requires CAP_BPF plus CAP_NET_ADMIN, which are routinely delegated to non-root network daemons and container workloads (Cilium-style XDP/cpumap pipelines) rather than requiring full root; consistent with scoring of other BPF/XDP subsystem issues.\nUI:N - The attacker performs every step — map creation, program attach, and packet injection through their own interface — with no action needed from any other user.\nS:U - Both the uninitialized stack disclosure and the out-of-bounds fragment write are contained within the kernel's own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Uninitialized cpumap kthread stack memory is handed directly to the BPF program via xdp_md->rx_queue_index and exfiltrated to userspace, repeatedly and with groomable content, leaking kernel pointers; the accompanying frag_size corruption additionally provides memory-corruption primitives leverageable for broader disclosure.\nI:H - Garbage rxq.frag_size makes the unsigned tailroom computation in bpf_xdp_frags_increase_tail() underflow, bypassing the bounds check and permitting memset() of an attacker-chosen length past the last fragment — an out-of-bounds heap write, plus inconsistent sinfo->xdp_frags_size accounting propagated into subsequent skb construction.\nA:H - The out-of-bounds zeroing of adjacent page/heap memory corrupts unrelated kernel structures and leads to oops or panic, and the bogus queue_index/frag_size values also cause misrouted XSK redirects and inconsistent frame accounting in the receive path."
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}
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]
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}
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],
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"kernel/bpf/cpumap.c"
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|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
},
|
|
"dataVersion": "5.2"
|
|
} |