221 lines
11 KiB
JSON
221 lines
11 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-2024-35834",
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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": "2024-05-17T13:50:33.103Z",
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"datePublished": "2024-05-17T14:02:19.184Z",
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"dateUpdated": "2026-08-05T11:30:12.321Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:30:12.321Z"
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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\nxsk: recycle buffer in case Rx queue was full\n\nAdd missing xsk_buff_free() call when __xsk_rcv_zc() failed to produce\ndescriptor to XSK Rx queue."
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}
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],
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{
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"baseScore": 8.2,
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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:N - The trigger condition — the AF_XDP Rx ring becoming full in `__xsk_rcv_zc()` — is produced purely by inbound network packets arriving faster than the userspace application drains the ring, so a remote attacker flooding the NIC bound to the zero-copy socket reaches the vulnerable path with no local access. AF_XDP zero-copy data planes (cloud load balancers, 5G UPF, DPDK-style userspace networking) are by definition internet-facing.\nAC:L - The attacker fully controls the trigger by sending traffic faster than the application consumes it; there is no race to win and no memory-layout dependency, and `XDP_USE_NEED_WAKEUP` (which makes the ice/i40e drivers take the `XDP_EXIT` path that also skips the free) is the libbpf/xdpsock default. Every `-ENOBUFS` event leaks a buffer, so a flood drains the fixed-size umem pool deterministically.\nPR:N - No credentials or local account are needed — the attacker only has to send packets to the interface, and the entire path runs in the driver NAPI/XDP receive context before any authentication or authorization exists.\nUI:N - The leak occurs automatically during packet reception in the driver's NAPI poll; no action by any local user or administrator is required beyond the AF_XDP application already running.\nS:U - The leaked buffers and the resulting resource exhaustion are confined to the kernel's XSK buffer pool and the host's network stack, with no crossing into a hypervisor, IOMMU, or other security authority.\nC:N - There is no out-of-bounds read, uninitialized-memory read, or use-after-free; the stale `xskb_list` fragments that get mis-delivered contain packet data that was already destined for that same socket's umem, so no kernel memory or cross-boundary data is disclosed.\nI:L - Fragments left on the shared `pool->xskb_list` are produced as descriptors for a subsequent, unrelated frame, and the already-reserved `XDP_PKT_CONTD` descriptors desynchronize reassembly, so the attacker can cause corrupted, mis-assembled packet data to be delivered to the userspace application. This is bounded data corruption on the receive path, not an arbitrary write or control-flow hijack.\nA:H - Each Rx-full event permanently removes a chunk from the fixed-size, non-replenishable XSK buffer pool; a sustained flood drains it entirely, after which `xp_alloc_batch()` returns nothing, the Rx ring cannot be refilled, and packet reception on that queue ceases while `ice_clean_rx_irq_zc()` keeps returning `budget` and re-arming NAPI. This is a complete, non-self-healing denial of service of the network data path requiring an application restart to recover."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/xdp/xsk.c"
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],
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"programFiles": [
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"net/xdp/xsk.c"
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"version": "0",
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"lessThan": "6.6",
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"status": "unaffected",
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"versionType": "semver"
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},
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"version": "6.6.15",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.7.3",
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"lessThanOrEqual": "6.7.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.8",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"url": "https://git.kernel.org/stable/c/cce713664548284daf977739e7ff1cd59e84189c"
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}
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"title": "xsk: recycle buffer in case Rx queue was full",
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"timestamp": "2024-06-12T15:14:57.887303Z",
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"id": "CVE-2024-35834",
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