CVE-2025-22003 — can: ucan: fix out of bound read in strscpy() source

Affected: Linux

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

can: ucan: fix out of bound read in strscpy() source

Commit 7fdaf8966aae ("can: ucan: use strscpy() to instead of strncpy()") unintentionally introduced a one byte out of bound read on strscpy()'s source argument (which is kind of ironic knowing that strscpy() is meant to be a more secure alternative :)).

Let's consider below buffers:

dest[len + 1]; /* will be NUL terminated */ src[len]; /* may not be NUL terminated */

When doing:

strncpy(dest, src, len); dest[len] = '\0';

strncpy() will read up to len bytes from src.

On the other hand:

strscpy(dest, src, len + 1);

will read up to len + 1 bytes from src, that is to say, an out of bound read of one byte will occur on src if it is not NUL terminated. Note that the src[len] byte is never copied, but strscpy() still needs to read it to check whether a truncation occurred or not.

This exact pattern happened in ucan.

The root cause is that the source is not NUL terminated. Instead of doing a copy in a local buffer, directly NUL terminate it as soon as usb_control_msg() returns. With this, the local firmware_str[] variable can be removed.

On top of this do a couple refactors:

- ucan_ctl_payload->raw is only used for the firmware string, so rename it to ucan_ctl_payload->fw_str and change its type from u8 to char.

- ucan_device_request_in() is only used to retrieve the firmware string, so rename it to ucan_get_fw_str() and re…

USN-7605-1 — linux, linux-aws, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oracle, linux-raspi, linux-realtime vulnerabilities

Affected: Ubuntu:24.04:LTS: linux-gcp-6.11, Ubuntu:24.04:LTS: linux-hwe-6.11

It was discovered that the CIFS network file system implementation in the Linux kernel did not properly verify the target namespace when handling upcalls. An attacker could use this to expose sensitive information. (CVE-2025-2312)

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; - PowerPC architecture; - x86 architecture; - Compute Acceleration Framework; - ACPI drivers; - Ublk userspace block driver; - Compressed RAM block device driver; - Bus devices; - AMD CDX bus driver; - Clock framework and drivers; - DMA engine subsystem; - DPLL subsystem; - Qualcomm firmware drivers; - GPIO subsystem; - GPU drivers; - HID subsystem; - IIO subsystem; - InfiniBand drivers; - Multiple devices driver; - Media drivers; - MemoryStick subsystem; - Network drivers; - Mellanox network drivers; - NTB driver; - NVME drivers; - PCI subsystem; - Pin controllers subsystem; - RapidIO drivers; - Voltage and Current Regulator drivers; - Remote Processor subsystem; - SCSI subsystem; - SLIMbus drivers; - QCOM SoC drivers; - VideoCore services drivers; - Thermal drivers; - USB DSL drivers; - USB Host Controller drivers; - Renesas USBHS Controller drivers; - USB Type-C Connector System Software Interface driver; - Virtio Host (VHOST) subsystem; - Fr…

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CVE-2025-22003 — can: ucan: fix out of bound read in strscpy() source

USN-7605-1 — linux, linux-aws, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oracle, linux-raspi, linux-realtime vulnerabilities