Bug 2422777 (CVE-2025-68256)

Summary: CVE-2025-68256 kernel: staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-16 15:04:09 UTC 
In the Linux kernel, the following vulnerability has been resolved:

staging: rtl8723bs: fix out-of-bounds read in rtw_get_ie() parser

The Information Element (IE) parser rtw_get_ie() trusted the length
byte of each IE without validating that the IE body (len bytes after
the 2-byte header) fits inside the remaining frame buffer. A malformed
frame can advertise an IE length larger than the available data, causing
the parser to increment its pointer beyond the buffer end. This results
in out-of-bounds reads or, depending on the pattern, an infinite loop.

Fix by validating that (offset + 2 + len) does not exceed the limit
before accepting the IE or advancing to the next element.

This prevents OOB reads and ensures the parser terminates safely on
malformed frames.
Comment 1 Alexander B 2025-12-16 20:39:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121612-CVE-2025-68256-5ed2@gregkh/T