CVE-2025-21762

arp: use RCU protection in arp_xmit()

HIGH

8.1

CVSS Score

Published: February 27, 2025 at 02:18 AM UTC

Updated: October 15, 2026 at 02:17 AM UTC

2 products affected across 2 vendorsLinux KernelSIMATIC S7-1500 TM MFP

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Severity

HIGH8.1

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: arp: use RCU protection in arp_xmit() arp_xmit() can be called without RTNL or RCU protection. Use RCU protection to avoid potential UAF.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.4 ≤ v < 5.4.2915.11 ≤ v < 5.15.1795.16 ≤ v < 6.1.1295.5 ≤ v < 5.10.2356.13 ≤ v < 6.13.46.2 ≤ v < 6.6.796.7 ≤ v < 6.12.1629a26a56803855a79dbd028cd61abee56237d6e56.14 6.14 rc1 6.14 rc2

Vendor states this is fixed in 01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe (fixed)

Vendor states this is fixed in 10f555e3f573d004ae9d89b3276abb58c4ede5c3 (fixed)

Vendor states this is fixed in 2c331718d3389b6c5f6855078ab7171849e016bd (fixed)

Vendor states this is fixed in 307cd1e2d3cb1cbc6c40c679cada6d7168b18431 (fixed)

Vendor states this is fixed in a42b69f692165ec39db42d595f4f65a4c8f42e44 (fixed)

Vendor states this is fixed in d9366ac2f956a1948b68c0500f84a3462ff2ed8a (fixed)

Vendor states this is fixed in e9f4dee534eb1b225b0a120395ad9bc2afe164d3 (fixed)

Vendor states this is fixed in f189654459423d4d48bef2d120b4bfba559e6039 (fixed)

Vendor states this is fixed in 4.4 (unaffected)

Vendor states this is fixed in 5.10.235 (unaffected)

Vendor states this is fixed in 5.15.179 (unaffected)

Vendor states this is fixed in 5.4.291 (unaffected)