CVE-2026-46320tap: free page on error paths in tap_get_user_xdp()
- 7.4HighCVSS base score
- 0.25%Exploitation in 30 daysEPSS · top 83% 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: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk. Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().
Timeline
ID reserved
By Linux
- 27 days later
· 27 days later
Published
- 4 months later
· 4 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 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (12 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 7.4.
Affected products
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < 8d03e65eb6cfbffec471a6b65416f93679bf3286
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < f979971835dddbca86cf99e3b2e2b94a408a1ab2
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < 3f52a86a482a69294c50a5a2a097bd6f4104990a
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < d30aac0fa00ca0afc3e08174cf7f974a66bdcf05
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < d68eab61944a9b0826fa2e954e42db1aa3201b7a
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < e27c17346628cb56843a83f93ac63c314c00f388
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < 18a84c35842e19cd3c5534d8cee73d31863f696d
- affected 0efac27791ee068075d80f07c55a229b1335ce12 – < 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2
- affected 4.20
- unaffected < 4.20
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.12 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References9
- https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286 (opens in a new tab)
- https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2 (opens in a new tab)
- https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a (opens in a new tab)
- https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 (opens in a new tab)
- https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a (opens in a new tab)
- https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388 (opens in a new tab)
- https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d (opens in a new tab)
- https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.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-2026-35410 (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-2026-46320)Record last updated .