CVE-2024-36895 — usb: gadget: uvc: use correct buffer size when parsing configfs lists

Affected: Linux

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

usb: gadget: uvc: use correct buffer size when parsing configfs lists

This commit fixes uvc gadget support on 32-bit platforms.

Commit 0df28607c5cb ("usb: gadget: uvc: Generalise helper functions for reuse") introduced a helper function __uvcg_iter_item_entries() to aid with parsing lists of items on configfs attributes stores. This function is a generalization of another very similar function, which used a stack-allocated temporary buffer of fixed size for each item in the list and used the sizeof() operator to check for potential buffer overruns. The new function was changed to allocate the now variably sized temp buffer on heap, but wasn't properly updated to also check for max buffer size using the computed size instead of sizeof() operator.

As a result, the maximum item size was 7 (plus null terminator) on 64-bit platforms, and 3 on 32-bit ones. While 7 is accidentally just barely enough, 3 is definitely too small for some of UVC configfs attributes. For example, dwFrameInteval, specified in 100ns units, usually has 6-digit item values, e.g. 166666 for 60fps.

USN-6949-1 — linux, linux-aws, linux-gcp, linux-gke, linux-ibm, linux-nvidia, linux-nvidia-6.8 vulnerabilities

Affected: Ubuntu:22.04:LTS: linux-nvidia-6.8, Ubuntu:24.04:LTS: linux, Ubuntu:24.04:LTS: linux-aws, Ubuntu:24.04:LTS: linux-gcp, Ubuntu:24.04:LTS: linux-gke, Ubuntu:24.04:LTS: linux-ibm, Ubuntu:24.04:LTS: linux-nvidia

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM32 architecture; - ARM64 architecture; - M68K architecture; - OpenRISC architecture; - PowerPC architecture; - RISC-V architecture; - x86 architecture; - Block layer subsystem; - Accessibility subsystem; - Bluetooth drivers; - Clock framework and drivers; - CPU frequency scaling framework; - Hardware crypto device drivers; - DMA engine subsystem; - DPLL subsystem; - FireWire subsystem; - EFI core; - Qualcomm firmware drivers; - GPIO subsystem; - GPU drivers; - Microsoft Hyper-V drivers; - InfiniBand drivers; - IOMMU subsystem; - IRQ chip drivers; - Macintosh device drivers; - Multiple devices driver; - Media drivers; - EEPROM drivers; - MMC subsystem; - Network drivers; - STMicroelectronics network drivers; - Device tree and open firmware driver; - HiSilicon SoC PMU drivers; - PHY drivers; - Pin controllers subsystem; - Remote Processor subsystem; - S/390 drivers; - SCSI drivers; - SPI subsystem; - Media staging drivers; - Thermal drivers; - Userspace I/O drivers; - USB subsystem; - DesignWare USB3 driver; - ACRN Hypervisor Service Module driver; - Virtio drivers; - 9P distributed file system; - BTRFS file system; - eCrypt file system; - EROFS file system; - File systems infrastructure; - GF…

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CVE-2024-36895 — usb: gadget: uvc: use correct buffer size when parsing configfs lists

USN-6949-1 — linux, linux-aws, linux-gcp, linux-gke, linux-ibm, linux-nvidia, linux-nvidia-6.8 vulnerabilities