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CVE-2026-46320

tap: free page on error paths in tap_get_user_xdp()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in 8d03e65eb6cfbffec471a6b65416f93679bf3286; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in f979971835dddbca86cf99e3b2e2b94a408a1ab2; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in 3f52a86a482a69294c50a5a2a097bd6f4104990a; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in d30aac0fa00ca0afc3e08174cf7f974a66bdcf05; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in d68eab61944a9b0826fa2e954e42db1aa3201b7a; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in e27c17346628cb56843a83f93ac63c314c00f388; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in 18a84c35842e19cd3c5534d8cee73d31863f696d; From 0efac27791ee068075d80f07c55a229b1335ce12 · fixed in 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2

  • Linux Linux

    4.20

  • KernelLinux

    From 4.20.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.12

References 8

git.kernel.org