AZL-51829
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-51829.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-51829
- Upstream
- Published
- 2024-10-21T18:15:18Z
- Modified
- 2026-04-01T05:17:46.389464Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- CVE-2024-49978 affecting package kernel 5.15.200.1-1
- 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.
- References