CVE-2025-38657

wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()

State: Published
Severity: 7.3 High
Published: Aug 22, 2025
Updated: Aug 5, 2026
Reserved: Apr 16, 2025

Description

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

wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()

The "link_id" value comes from the user via debugfs. If it's larger than BITS_PER_LONG then that would result in shift wrapping and potentially an out of bounds access later. In fact, we can limit it to IEEE80211_MLD_MAX_NUM_LINKS (15).

Fortunately, only root can write to debugfs files so the security impact is minimal.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	9dd85e739ce0765f022014c3e0713e1007d7ef60 to before 417cfa9cc44fbe6bceab786f9a4ee5a210f1288eAffected 9dd85e739ce0765f022014c3e0713e1007d7ef60 to before 53cf488927a0f79968f9c03c4d1e00d2a79731c3Affected
LinuxLinux	6.16Affected before 6.16Not affected 6.16.1 through 6.16.*Not affected 6.17 and laterNot affected

References

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