CVE-2024-49978

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Source
https://cve.org/CVERecord?id=CVE-2024-49978
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49978.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-49978
Downstream
Related
Published
2024-10-21T18:02:25.151Z
Modified
2026-03-20T12:39:29.157375Z
Summary
gso: fix udp gso fraglist segmentation after pull from frag_list
Details

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 skbsegment instead of skbsegment_list, as the first can segment them correctly.

Valid SKBGSOFRAGLIST skbs - consist of two or more segments - the headskb holds the protocol headers plus first gsosize - one or more fraglist skbs hold exactly one segment - all but the last must be gsosize

Optional datapath hooks such as NAT and BPF (bpfskbpull_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 _udpv4gsosegmentlistcsum at udphdr(seg->next)->dest.

Detect invalid geometry due to pull, by checking headskb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skbsegment.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49978.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
9fd1ff5d2ac7181844735806b0a703c942365291
Fixed
080e6c9a3908de193a48f646c5ce1bfb15676ffc
Fixed
af3122f5fdc0d00581d6e598a668df6bf54c9daa
Fixed
33e28acf42ee863f332a958bfc2f1a284a3659df
Fixed
3cd00d2e3655fad3bda96dc1ebf17b6495f86fea
Fixed
a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-49978.json"