CVE-2024-49978: gso: fix udp gso fraglist segmentation after pull from frag_list
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: gso: fix udp gso fraglist segmentation after pull from frag_list Detect 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 UDP, this causes a NULL ptr deref in __udpv4_gso_segment_list_csum at udp_hdr(seg->next)->dest. 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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.6<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| Linux Kernel | =6.12-rc1 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc
- https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa
- https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df
- https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea
- https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49978
- https://nvd.nist.gov/vuln/detail/CVE-2024-49978
- https://launchpad.net/bugs/cve/CVE-2024-49978
- https://security-tracker.debian.org/tracker/CVE-2024-49978
- https://ubuntu.com/security/CVE-2024-49978
- https://git.kernel.org/linus/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab
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