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.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-gcpUpgrade linux-image-generic-64kUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-realtimeUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-azure-fdeUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-azureUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.11.0-1015-oemUpgrade linux-image-awsUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-raspiUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-oem-24.04aUpgrade linux-image-genericUpgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-oem-24.04Upgrade linux-image-oem-24.04bUpgrade linux-image-virtual | Feb 20, 2025 | Oct 21, 2024 |
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