CVE-2025-21954

MediumCVSS 5.5/10Last modified Jul 30, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

netmem: prevent TX of unreadable skbs

Currently on stable trees we have support for netmem/devmem RX but not TX. It is not safe to forward/redirect an RX unreadable netmem packet into the device's TX path, as the device may call dma-mapping APIs on dma addrs that should not be passed to it.

Fix this by preventing the xmit of unreadable skbs.

Tested by configuring tc redirect:

sudo tc qdisc add dev eth1 ingress sudo tc filter add dev eth1 ingress protocol ip prio 1 flower ip_proto \ tcp src_ip 192.168.1.12 action mirred egress redirect dev eth1

Before, I see unreadable skbs in the driver's TX path passed to dma mapping APIs.

After, I don't see unreadable skbs in the driver's TX path passed to dma mapping APIs.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-401

Affected software

VendorProductVersions
LinuxLinux>= 65249feb6b3df9e17bab5911ee56fa7b0971e231, < 454825019d2f0c59e5174ece9e713f45ad80beff; >= 65249feb6b3df9e17bab5911ee56fa7b0971e231, < 1c17c8ced25c5fbe424c7ad7ea11d33014a986b1; >= 65249feb6b3df9e17bab5911ee56fa7b0971e231, < f3600c867c99a2cc8038680ecf211089c50e7971
LinuxLinux6.12

References

Timeline

Published
Apr 1, 2025
Last modified
Jul 30, 2026
NVD status
Modified

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CVE-2025-21954: Medium severity, CVSS 5.5 | Vulnix