381 lines
18 KiB
JSON
381 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-36929",
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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": "2024-05-30T15:25:07.069Z",
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"datePublished": "2024-05-30T15:29:21.430Z",
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"dateUpdated": "2026-10-15T00:42:53.205Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:32:08.251Z"
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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\nnet: core: reject skb_copy(_expand) for fraglist GSO skbs\n\nSKB_GSO_FRAGLIST skbs must not be linearized, otherwise they become\ninvalid. Return NULL if such an skb is passed to skb_copy or\nskb_copy_expand, in order to prevent a crash on a potential later\ncall to skb_gso_segment."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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 invalid skb is manufactured entirely from received UDP traffic — fraglist GRO aggregates remotely-sourced datagrams, and `udp_gro_receive` marks any UDP packet lacking a local socket as fraglist-eligible, so forwarded flows from arbitrary internet sources qualify. Bridge/overlay ports (VXLAN, GRE, L2TP) carrying such traffic mean the attacker need not sit on the victim's L2 segment.\nAC:L - The attacker fully controls both preconditions for GRO coalescing — sending back-to-back same-flow UDP datagrams is sufficient to build the fraglist skb, and the resulting `udp_hdr(seg->next)->dest` dereference on a NULL `seg->next` is deterministic, not layout- or timing-dependent. No memory grooming or race win is needed.\nPR:N - The entire path — NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` → `skb_gso_segment` — runs in softirq on unauthenticated received packets. The attacker needs no account, credentials, or capability on the target.\nUI:N - Triggering requires only that the victim host receive and forward the attacker's UDP packets, which happens automatically in the receive/transmit softirq. No administrator or user action is involved.\nS:U - The fault occurs in the kernel's own network stack and its impact is confined to that kernel's security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The failure is a NULL pointer dereference at a small fixed offset (`udp_hdr(NULL)->dest`), which faults immediately below `mmap_min_addr` rather than reading valid memory. No out-of-bounds read, uninitialized data, or kernel pointer is exposed to the attacker.\nI:N - Nothing is written outside the skb before the oops — only the packet's own UDP length field is updated in `__udp_gso_segment_list()`. There is no out-of-bounds write, use-after-free, or type confusion, so no control-flow-hijack or arbitrary-write primitive arises.\nA:H - The NULL dereference happens in softirq context on the transmit path, producing a kernel oops that on a forwarding device typically panics the machine (and is fatal with `panic_on_oops`). An unauthenticated attacker can repeat it at will with a UDP burst, causing complete loss of availability."
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}
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