# CVE-2024-49979: linux: In the Linux kernel, the following vulnerability has been resolved:  net: gso: fix tcp fraglist segmentation after pu...

CVE-2024-49979 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49979, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49979
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0059
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49979](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49979.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49979](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49979.md) | Oct 21, 2024 |

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