CVE-2026-68479

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btrtl: validate firmware patch bounds rtlbt_parse_firmware() copies patch_length - 4 bytes before appending the firmware version. A malformed firmware patch shorter than the version field can make this subtraction underflow and turn the copy into an oversized read and write during Bluetooth setup. The existing patch_offset + patch_length check can also wrap on 32-bit architectures. Validate the patch length and range without arithmetic overflow before allocating or copying the patch.

References

• https://git.kernel.org/stable/c/39e01b4addfbbe177567d6ed1dfb81f9cccb19e6
• https://git.kernel.org/stable/c/609c5b04a28dc1b0f3af6a7bc93055135b2d2059
• https://git.kernel.org/stable/c/6744ab60dfac55d1df5733960aad5be300984301
• https://git.kernel.org/stable/c/68c5a2a19987c035eb129e627e579adafb04f637
• https://git.kernel.org/stable/c/83534891c058ed71e251135072640911670869aa