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CVE-2026-46321— tun: free page on short-frame rejection 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()函数在拒绝短帧时未释放vhost_net_build_xdp()分配的页面，导致页面泄漏，可能被本地进程利用耗尽主机内存触发OOM崩溃。

CVSS 7.1 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 6100e0237204890269e3f934acfc50d35fd6f319< 0a6f46a9332ad6958992d64d3b3a81a80b2ca940 affected
589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2< 0e8211fcf9426f5adddf32516ba0f400ceb9544d affected
ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146< e915445942af6dcea628bf66d6241641201a0c41 affected
d5ad89b7d01ed4e66fd04734fc63d6e78536692a< 5b34f9e4fe2f203724a6e893d6df0316b9670057 affected
049584807f1d797fc3078b68035450a9769eb5c3< 69863ff2720a0e9871f1a5710f2a33a94217fee0 affected
049584807f1d797fc3078b68035450a9769eb5c3< 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0 affected
049584807f1d797fc3078b68035450a9769eb5c3< 98c67be9eb9de72465a071949e84a3cdb8fab5a3 affected
049584807f1d797fc3078b68035450a9769eb5c3< f4feb1e20058e407cb00f45aff47f5b7e19a6bbf affected
… +20 more rows
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I. Basic Information for CVE-2026-46321

Vulnerability Information
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Vulnerability Title
tun: free page on short-frame rejection 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 short-frame rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.
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()函数在拒绝短帧时未释放vhost_net_build_xdp()分配的页面，导致页面泄漏，可能被本地进程利用耗尽主机内存触发OOM崩溃。
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 6100e0237204890269e3f934acfc50d35fd6f319 ~ 0a6f46a9332ad6958992d64d3b3a81a80b2ca940 -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-46321

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III. Intelligence Information for CVE-2026-46321

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Patches & Fixes for CVE-2026-46321 (7)

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-2026-46322 7.1 HIGH tun: free page on build_skb failure 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-2026-46321

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