CVE-2026-74651

Status: UPDATED  |  Advisory ID: CVE-2026-74651

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()

rtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific

information element without checking that the element is long enough,

causing an out-of-bounds read for a short trailing IE.

The function locates a vendor-specific IE (EID 221) with rtw_get_ie()

and then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte

version word at pbuf + 6. Those accesses require the IE body to be at

least 6 bytes, but rtw_get_ie() only guarantees that the element fits

within the buffer; it does not enforce a minimum body length. A

vendor-specific IE whose length byte is 0 to 5, placed at the end of

the buffer, therefore makes these reads run past the end of the IE and

past the end of the buffer itself.

The buffer holds information elements taken from received management

frames and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which

is kmemdup'd to its exact length, so the read can run off the end of

the allocation.

The sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and

rtw_get_wps_ie() in this file already reject too-short vendor-specific

IEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in

line with them, and needs a minimum of 6 rather than 4 bytes because

of the version word. Add the missing length check. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References