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CVE-2026-46322— tun: free page on build_skb failure in tun_xdp_one()

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tun_xdp_one()函数在build_skb()失败时未释放vhost_net_build_xdp()分配的页面，导致页面泄漏。

CVSS 7.1 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 043d222f93ab8c76b56a3b315cd8692e35affb6c< 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 793385c154771603b8671dd8338927221e9d8d78 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 60d9c0d6cdde5420d6483c921b16fe5465eb5238 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< d16e38fac09a47bfcf98c1ad65a1bb53f94540f5 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< aa308e9dbb9acb17cacdbbce9e4504f69bac8385 affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 4fefc6156a162a9f50035c12091a5e5130c82c6e affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 affected
… +10 more rows
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I. Basic Information for CVE-2026-46322

Vulnerability Information
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Vulnerability Title
tun: free page on build_skb failure in tun_xdp_one()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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tun_xdp_one()函数在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 043d222f93ab8c76b56a3b315cd8692e35affb6c ~ 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-46322

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III. Intelligence Information for CVE-2026-46322

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Patches & Fixes for CVE-2026-46322 (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-2026-46320 7.4 HIGH tap: free page on error paths in tap_get_user_xdp()
CVE-2026-46328 7.3 HIGH apparmor: fix rlimit for posix cpu timers
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-2026-46322

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