CVE-2024-36929

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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The invalid skb is manufactured entirely from received UDP traffic \u2014 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 \u2014 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 \u2014 NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` \u2192 `skb_gso_segment` \u2014 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 \u2014 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`). 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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 \u2014 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 \u2014 NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` \u2192 `skb_gso_segment` \u2014 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 \u2014 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`). 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{}