CVE-2026-74476veth: convert frag_list skbs before running XDP
- 9.1CriticalCVSS base score
- 0.49%Exploitation in 30 daysEPSS · top 57% 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: veth: convert frag_list skbs before running XDP A frag_list skb can reach veth with data_len set but nr_frags zero. veth_convert_skb_to_xdp_buff() only converts skbs that are shared, locked, have frags[], or do not have enough headroom. It later uses skb_is_nonlinear() to decide whether to set XDP_FLAGS_HAS_FRAGS and xdp_frags_size. That exposes frag_list data to XDP as if it were stored in frags[], but frags[] is empty. AF_XDP copy mode can then trust the bogus XDP fragment metadata, walk an empty fragment entry, and crash in memcpy() from __xsk_rcv(). Route non-linear skbs through skb_pp_cow_data() before exposing them to XDP, and only advertise XDP frags when the resulting skb has frags[]. skb_copy_bits() already handles frag_list input, and skb_pp_cow_data() builds frags[] output with skb_add_rx_frag(), which is the representation XDP multi-buffer expects.
Timeline
ID reserved
By Linux
Published
- 2 months later
· 2 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 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| NVDNVD · Received | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.49% · top 57% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < 0be3632597b8349d43a7dc4244b492dc62a05998
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < 04958dba44dc795dc79ce2fcbc117821bbbd6542
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < 5c1c15c540fc45820ce3033c319151ec891bc10a
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < f9c1fff857e93be709c8b52ed1a643f37bd82c66
- affected 718a18a0c8a67f97781e40bdef7cdd055c430996 – < d0d6415963040c401e7a7e4e482a698ba52448cb
- affected 5.18
- unaffected < 5.18
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.153 – ≤ 6.6.*
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.44 – ≤ 6.18.*
- unaffected 7.1.8 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/0be3632597b8349d43a7dc4244b492dc62a05998 (opens in a new tab)
- https://git.kernel.org/stable/c/04958dba44dc795dc79ce2fcbc117821bbbd6542 (opens in a new tab)
- https://git.kernel.org/stable/c/5c1c15c540fc45820ce3033c319151ec891bc10a (opens in a new tab)
- https://git.kernel.org/stable/c/b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb (opens in a new tab)
- https://git.kernel.org/stable/c/f9c1fff857e93be709c8b52ed1a643f37bd82c66 (opens in a new tab)
- https://git.kernel.org/stable/c/d0d6415963040c401e7a7e4e482a698ba52448cb (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-2026-59669 (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-2026-74476)Record last updated .