Bug 2390373 (CVE-2025-38657)

Summary: CVE-2025-38657 kernel: wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-08-22 17:03:22 UTC 
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.
Comment 1 Alexander B 2025-08-25 10:39:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025082239-CVE-2025-38657-87b3@gregkh/T