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CVE-2026-46320— tap: free page on error paths in tap_get_user_xdp()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tap_get_user_xdp()函数在拒绝短帧或build_skb()失败时未释放vhost_net_build_xdp()分配的页面，导致页面泄漏。

CVSS 7.4 · High EPSS 0.25% · P16

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0efac27791ee068075d80f07c55a229b1335ce12< 8d03e65eb6cfbffec471a6b65416f93679bf3286 affected
0efac27791ee068075d80f07c55a229b1335ce12< f979971835dddbca86cf99e3b2e2b94a408a1ab2 affected
0efac27791ee068075d80f07c55a229b1335ce12< 3f52a86a482a69294c50a5a2a097bd6f4104990a affected
0efac27791ee068075d80f07c55a229b1335ce12< d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 affected
0efac27791ee068075d80f07c55a229b1335ce12< d68eab61944a9b0826fa2e954e42db1aa3201b7a affected
0efac27791ee068075d80f07c55a229b1335ce12< e27c17346628cb56843a83f93ac63c314c00f388 affected
0efac27791ee068075d80f07c55a229b1335ce12< 18a84c35842e19cd3c5534d8cee73d31863f696d affected
0efac27791ee068075d80f07c55a229b1335ce12< 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 affected
… +10 more rows
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I. Basic Information for CVE-2026-46320

Vulnerability Information
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Vulnerability Title
tap: free page on error paths in tap_get_user_xdp()
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tap_get_user_xdp()函数在拒绝短帧或build_skb()失败时未释放vhost_net_build_xdp()分配的页面，导致页面泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0efac27791ee068075d80f07c55a229b1335ce12 ~ 8d03e65eb6cfbffec471a6b65416f93679bf3286 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-46320

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III. Intelligence Information for CVE-2026-46320

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Patches & Fixes for CVE-2026-46320 (8)

Same Patch Batch · Linux · 2026-06-09 · 21 CVEs total

CVE-2026-46325 9.8 CRITICAL RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
CVE-2026-46316 9.3 CRITICAL KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry
CVE-2026-46317 8.8 HIGH KVM: arm64: Reassign nested_mmus array behind mmu_lock
CVE-2026-46326 8.4 HIGH iio: pressure: mprls0025pa: fix spi_transfer struct initialisation
CVE-2026-46332 8.0 HIGH greybus: gb-beagleplay: bound bootloader receive buffering
CVE-2026-52907 7.8 HIGH media: rockchip: rkcif: fix off by one bugs
CVE-2026-46319 7.8 HIGH net/sched: act_ct: Only release RCU read lock after ct_ft
CVE-2026-46330 7.8 HIGH Revert "net/smc: Introduce TCP ULP support"
CVE-2026-46323 7.8 HIGH net: gro: don't merge zcopy skbs
CVE-2026-46327 7.8 HIGH dm: fix unlocked test for dm_suspended_md
CVE-2026-46324 7.8 HIGH netfilter: nf_tables: use list_del_rcu for netlink hooks
CVE-2026-52906 7.7 HIGH 9p: fix access mode flags being ORed instead of replaced
CVE-2026-46328 7.3 HIGH apparmor: fix rlimit for posix cpu timers
CVE-2026-46322 7.1 HIGH tun: free page on build_skb failure in tun_xdp_one()
CVE-2026-46321 7.1 HIGH tun: free page on short-frame rejection in tun_xdp_one()
CVE-2026-46329 erofs: handle end of filesystem properly for file-backed mounts
CVE-2026-46318 Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
CVE-2026-52904 drm/nouveau: fix nvkm_device leak on aperture removal failure
CVE-2026-52905 mm/damon/core: disallow non-power of two min_region_sz on damon_start()
CVE-2026-46315 io_uring/waitid: clear waitid info before copying it to userspace

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46320

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