CVE-2024-49978gso: fix udp gso fraglist segmentation after pull from frag_list
- 7.5HighCVSS base score
- 0.66%Exploitation in 30 daysEPSS · top 48% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 22 months later
· 22 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.66% · top 48% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 9fd1ff5d2ac7181844735806b0a703c942365291 – < 080e6c9a3908de193a48f646c5ce1bfb15676ffc
- affected 9fd1ff5d2ac7181844735806b0a703c942365291 – < af3122f5fdc0d00581d6e598a668df6bf54c9daa
- affected 9fd1ff5d2ac7181844735806b0a703c942365291 – < 33e28acf42ee863f332a958bfc2f1a284a3659df
- affected 9fd1ff5d2ac7181844735806b0a703c942365291 – < 3cd00d2e3655fad3bda96dc1ebf17b6495f86fea
- affected 9fd1ff5d2ac7181844735806b0a703c942365291 – < a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab
- affected 5.6
- unaffected < 5.6
- unaffected 6.1.113 – ≤ 6.1.*
- unaffected 6.6.55 – ≤ 6.6.*
- unaffected 6.10.14 – ≤ 6.10.*
- unaffected 6.11.3 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References6
- https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc (opens in a new tab)
- https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa (opens in a new tab)
- https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df (opens in a new tab)
- https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea (opens in a new tab)
- https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-43656 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-49978)Record last updated .