CVE-2024-49979 (GCVE-0-2024-49979)
Vulnerability from cvelistv5
Published
2024-10-21 18:02
Modified
2026-05-11 20:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: gso: fix tcp fraglist segmentation after pull from frag_list Detect tcp gso fraglist skbs with corrupted geometry (see below) and pass these to skb_segment instead of skb_segment_list, as the first can segment them correctly. Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify these skbs, breaking these invariants. In extreme cases they pull all data into skb linear. For TCP, this causes a NULL ptr deref in __tcpv4_gso_segment_list_csum at tcp_hdr(seg->next). Detect invalid geometry due to pull, by checking head_skb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skb_segment. Approach and description based on a patch by Willem de Bruijn.
References
Impacted products
Vendor Product Version
Linux Linux Version: c2ea8cab368b9f25b5937a7f07ab1a66e90b8064
Version: 1f2b859225eb8d1ec974214ce4a581f8c528ae57
Version: bee88cd5bd83d40b8aec4d6cb729378f707f6197
Version: bee88cd5bd83d40b8aec4d6cb729378f707f6197
Version: bee88cd5bd83d40b8aec4d6cb729378f707f6197
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gso: fix tcp fraglist segmentation after pull from frag_list\n\nDetect tcp gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\n\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\nIn extreme cases they pull all data into skb linear. For TCP, this\ncauses a NULL ptr deref in __tcpv4_gso_segment_list_csum at\ntcp_hdr(seg-\u003enext).\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon\u0027t just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.\n\nApproach and description based on a patch by Willem de Bruijn."
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