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CVE-2025-68341— veth: reduce XDP no_direct return section to fix race

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veth中XDP no_direct返回部分竞争，可能导致竞争条件。

CVSS 9.8 · Critical EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 401cb7dae8130fd34eb84648e02ab4c506df7d5e< c1ceabcb347d1b0f7e70a7384ec7eff3847b7628 affected
401cb7dae8130fd34eb84648e02ab4c506df7d5e< d0bd018ad72a8a598ae709588934135017f8af52 affected
401cb7dae8130fd34eb84648e02ab4c506df7d5e< a14602fcae17a3f1cb8a8521bedf31728f9e7e39 affected
6.11 affected
< 6.11 unaffected
6.12.61≤ 6.12.* unaffected
6.17.11≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-68341

Vulnerability Information
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Vulnerability Title
veth: reduce XDP no_direct return section to fix race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: veth: reduce XDP no_direct return section to fix race As explain in commit fa349e396e48 ("veth: Fix race with AF_XDP exposing old or uninitialized descriptors") for veth there is a chance after napi_complete_done() that another CPU can manage start another NAPI instance running veth_pool(). For NAPI this is correctly handled as the napi_schedule_prep() check will prevent multiple instances from getting scheduled, but for the remaining code in veth_pool() this can run concurrent with the newly started NAPI instance. The problem/race is that xdp_clear_return_frame_no_direct() isn't designed to be nested. Prior to commit 401cb7dae813 ("net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.") the temporary BPF net context bpf_redirect_info was stored per CPU, where this wasn't an issue. Since this commit the BPF context is stored in 'current' task_struct. When running veth in threaded-NAPI mode, then the kthread becomes the storage area. Now a race exists between two concurrent veth_pool() function calls one exiting NAPI and one running new NAPI, both using the same BPF net context. Race is when another CPU gets within the xdp_set_return_frame_no_direct() section before exiting veth_pool() calls the clear-function xdp_clear_return_frame_no_direct().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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veth中XDP no_direct返回部分竞争，可能导致竞争条件。
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 401cb7dae8130fd34eb84648e02ab4c506df7d5e ~ c1ceabcb347d1b0f7e70a7384ec7eff3847b7628 -
Linux Linux 6.11 -

II. Public POCs for CVE-2025-68341

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III. Intelligence Information for CVE-2025-68341

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Same Patch Batch · Linux · 2025-12-23 · 6 CVEs total

CVE-2025-68340 7.8 HIGH team: Move team device type change at the end of team_port_add
CVE-2025-68343 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header
CVE-2025-68342 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing data
CVE-2025-68339 atm/fore200e: Fix possible data race in fore200e_open()
CVE-2025-68338 net: dsa: microchip: Don't free uninitialized ksz_irq

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68341

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