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

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (3.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-38657: held from 0.001 to 0.002.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

  • Linux — versions 9dd85e739ce0765f022014c3e0713e1007d7ef60, 6.16, 0
  • 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.