Out-of-bounds Read in Linux
CVE-2025-38657
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.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (4.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H.
Affected products
- Linux — versions 9dd85e739ce0765f022014c3e0713e1007d7ef60, 6.16, 0
- Linux Linux_kernel — versions 6.16
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-38657?
- CVE-2025-38657 is a high-severity vulnerability in Linux, classified under Out-of-bounds Read. CVSS score: 7.3/10. Published 2025-08-22.
- How severe is CVE-2025-38657?
- High severity. CVSS v3 base score is 7.3 out of 10.