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THREATINT
PUBLISHED

CVE-2024-49978

gso: fix udp gso fraglist segmentation after pull from frag_list



Description

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.

Reserved 2024-10-21 | Published 2024-10-21 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

9fd1ff5d2ac7181844735806b0a703c942365291 before 080e6c9a3908de193a48f646c5ce1bfb15676ffc
affected

9fd1ff5d2ac7181844735806b0a703c942365291 before af3122f5fdc0d00581d6e598a668df6bf54c9daa
affected

9fd1ff5d2ac7181844735806b0a703c942365291 before 33e28acf42ee863f332a958bfc2f1a284a3659df
affected

9fd1ff5d2ac7181844735806b0a703c942365291 before 3cd00d2e3655fad3bda96dc1ebf17b6495f86fea
affected

9fd1ff5d2ac7181844735806b0a703c942365291 before a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab
affected

Default status
affected

5.6
affected

Any version before 5.6
unaffected

6.1.113
unaffected

6.6.55
unaffected

6.10.14
unaffected

6.11.3
unaffected

6.12
unaffected

References

git.kernel.org/...c/080e6c9a3908de193a48f646c5ce1bfb15676ffc

git.kernel.org/...c/af3122f5fdc0d00581d6e598a668df6bf54c9daa

git.kernel.org/...c/33e28acf42ee863f332a958bfc2f1a284a3659df

git.kernel.org/...c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea

git.kernel.org/...c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab

cve.org (CVE-2024-49978)

nvd.nist.gov (CVE-2024-49978)

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