CVE-2026-64443staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop

Official description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer. Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions. Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len. Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length for consistency with the sizeof(*pIE) guards added above.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25
• https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539
• https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29
• https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070
• https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4
• https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907
• https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16