CVE-2026-74458
In the Linux kernel, the following vulnerability has been resolved:
can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents
The wait and bulk receive paths walk variable-length commands from a
USB buffer. A nonzero command shorter than CMD_HEADER_LEN can still be
dispatched, and the wait path copies a matching command into a fixed
caller-owned struct kvaser_cmd using the device-provided length.
Reject nonzero commands that do not contain the fixed header or that
extend beyond the current USB buffer item. In the wait path, also reject
a matching command that exceeds the destination before copying it.
CSIRTS triage
- What
- Insufficient validation of received command extents in kvaser_usb_leaf driver allows buffer overflow.
- Who is affected
- Systems running affected Linux kernel versions with kvaser_usb_leaf CAN driver and Kvaser USB devices connected.
- Urgency
- Moderate; unvalidated command extents can cause denial of service or memory corruption.
- Action
- Apply kernel patch validating command extents or update to patched kernel version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Advisory coverage (3)
- unknownDSA-6466-1 linux - security updatedebian · 2026-08-25
- unknownCVE-2026-74458: In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb_leaf: kvas…nvd · 2026-08-15
- mediumCVE-2026-74458: can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extentsmsrc · 2026-08-11
External references
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