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

CVSS 7.1 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux043d222f93ab8c76b56a3b315cd8692e35affb6c< 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 793385c154771603b8671dd8338927221e9d8d78affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 60d9c0d6cdde5420d6483c921b16fe5465eb5238affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< d16e38fac09a47bfcf98c1ad65a1bb53f94540f5affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< aa308e9dbb9acb17cacdbbce9e4504f69bac8385affected
043d222f93ab8c76b56a3b315cd8692e35affb6c< 4fefc6156a162a9f50035c12091a5e5130c82c6eaffected
043d222f93ab8c76b56a3b315cd8692e35affb6c< aa8963fdce667a42fb7f0bdd2909fadcab02f9a8affected
… +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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 043d222f93ab8c76b56a3b315cd8692e35affb6c ~ 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9 -
LinuxLinux 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-2026-463259.8 CRITICALRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
CVE-2026-463169.3 CRITICALKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry
CVE-2026-463178.8 HIGHKVM: arm64: Reassign nested_mmus array behind mmu_lock
CVE-2026-463268.4 HIGHiio: pressure: mprls0025pa: fix spi_transfer struct initialisation
CVE-2026-463328.0 HIGHgreybus: gb-beagleplay: bound bootloader receive buffering
CVE-2026-529077.8 HIGHmedia: rockchip: rkcif: fix off by one bugs
CVE-2026-463197.8 HIGHnet/sched: act_ct: Only release RCU read lock after ct_ft
CVE-2026-463307.8 HIGHRevert "net/smc: Introduce TCP ULP support"
CVE-2026-463237.8 HIGHnet: gro: don't merge zcopy skbs
CVE-2026-463277.8 HIGHdm: fix unlocked test for dm_suspended_md
CVE-2026-463247.8 HIGHnetfilter: nf_tables: use list_del_rcu for netlink hooks
CVE-2026-529067.7 HIGH9p: fix access mode flags being ORed instead of replaced
CVE-2026-463207.4 HIGHtap: free page on error paths in tap_get_user_xdp()
CVE-2026-463287.3 HIGHapparmor: fix rlimit for posix cpu timers
CVE-2026-463217.1 HIGHtun: free page on short-frame rejection in tun_xdp_one()
CVE-2026-46329erofs: handle end of filesystem properly for file-backed mounts
CVE-2026-46318Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
CVE-2026-52904drm/nouveau: fix nvkm_device leak on aperture removal failure
CVE-2026-52905mm/damon/core: disallow non-power of two min_region_sz on damon_start()
CVE-2026-46315io_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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