CVE-2026-46320
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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().
- CVSS 3.1
- 7.4 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696dPatch
- https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2Patch
- https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990aPatch
- https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286Patch
- 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/f979971835dddbca86cf99e3b2e2b94a408a1ab2Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.