CVE-2026-46320tap: free page on error paths in tap_get_user_xdp()
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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().
- CVSS
- 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0efac27791ee068075d80f07c55a229b1335ce12 before 8d03e65eb6cfbffec471a6b65416f93679bf3286; from 0efac27791ee068075d80f07c55a229b1335ce12 before f979971835dddbca86cf99e3b2e2b94a408a1ab2; from 0efac27791ee068075d80f07c55a229b1335ce12 before 3f52a86a482a69294c50a5a2a097bd6f4104990a; from 0efac27791ee068075d80f07c55a229b1335ce12 before d30aac0fa00ca0afc3e08174cf7f974a66bdcf05; from 0efac27791ee068075d80f07c55a229b1335ce12 before d68eab61944a9b0826fa2e954e42db1aa3201b7a; from 0efac27791ee068075d80f07c55a229b1335ce12 before e27c17346628cb56843a83f93ac63c314c00f388; from 0efac27791ee068075d80f07c55a229b1335ce12 before 18a84c35842e19cd3c5534d8cee73d31863f696d; from 0efac27791ee068075d80f07c55a229b1335ce12 before 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.20 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.12; 7.1; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286patch
- https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2patch
- https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990apatch
- https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05patch
- https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7apatch
- https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388patch
- https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696dpatch
- https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.