CVE-2026-46322

Summary

In the Linux kernel, the following vulnerability has been resolved:

tun: free page on build_skb failure in tun_xdp_one()

When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk.

Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < 793385c154771603b8671dd8338927221e9d8d78affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < 60d9c0d6cdde5420d6483c921b16fe5465eb5238affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < d16e38fac09a47bfcf98c1ad65a1bb53f94540f5affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < aa308e9dbb9acb17cacdbbce9e4504f69bac8385affected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < 4fefc6156a162a9f50035c12091a5e5130c82c6eaffected
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c < aa8963fdce667a42fb7f0bdd2909fadcab02f9a8affected
LinuxLinux4.20affected
LinuxLinux0 < 4.20unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References