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CVE-2024-49949 is an integer-underflow flaw in the Linux kernel networking subsystem's qdisc_pkt_len_init() packet-length estimation logic when handling UDP Fragmentation Offload (UFO) GSO packets. A malformed IPv4 SKB_GSO_UDP packet whose total length equals its IPv4-plus-UDP header length can cause the GSO segment calculation to return zero. Subsequent arithmetic subtracts one from that zero segment count while updating the estimated packet length, producing an invalid length estimate. This invalid state can cause a NULL-pointer dereference in the FQ-CoDel enqueue path.
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A potential integer underflow in Linux kernel network qdisc packet-length initialization when using UFO.
Linux kernel networking flaw involving a potential underflow in qdisc_pkt_len_init() when UFO is used.
Linux kernel networking flaw involving a potential underflow in qdisc_pkt_len_init() when using UDP Fragmentation Offload (UFO).
A Linux kernel networking flaw involving a potential underflow in qdisc_pkt_len_init() when UFO is used.
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Cross-references every affected SKU, including bundled OEM variants.
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