In the Linux kernel, the following vulnerability has been resolved:
comedi: vmk80xx: fix incomplete endpoint checking
While vmk80xx does have endpoint checking implemented, some things can fall through the cracks. Depending on the hardware model, URBs can have either bulk or interrupt type, and current version of vmk80xx_find_usb_endpoints() function does not take that fully into account. While this warning does not seem to be too harmful, at the very least it will crash systems with 'panic_on_warn' set on them.
Fix the issue found by Syzkaller [1] by somewhat simplifying the endpoint checking process with usb_find_common_endpoints() and ensuring that only expected endpoint types are present.
This patch has not been tested on real hardware.
[1] Syzkaller report: usb 1-1: BOGUS urb xfer, pipe 1 != type 3 WARNING: CPU: 0 PID: 781 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> usb_start_wait_urb+0x113/0x520 drivers/usb/core/message.c:59 vmk80xx_reset_device drivers/comedi/drivers/vmk80xx.c:227 [inline] vmk80xx_auto_attach+0xa1c/0x1a40 drivers/comedi/drivers/vmk80xx.c:818 comedi_auto_config+0x238/0x380 drivers/comedi/drivers.c:1067 usb_probe_interface+0x5cd/0xb00 drivers/usb/core/driver.c:399 ...
Similar issue also found by Syzkaller:
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 3.9 | 4.19.313 |
| linux / linux_kernel | 4.20 | 5.4.275 |
| linux / linux_kernel | 5.5 | 5.10.216 |
| linux / linux_kernel | 5.11 | 5.15.157 |
| linux / linux_kernel | 5.16 | 6.1.88 |
| linux / linux_kernel | 6.2 | 6.6.29 |
| linux / linux_kernel | 6.7 | 6.8.8 |
| linux / linux_kernel | 6.9-rc1 | 6.9-rc1.x |
| linux / linux_kernel | 6.9-rc2 | 6.9-rc2.x |
| linux / linux_kernel | 6.9-rc3 | 6.9-rc3.x |
| linux / linux_kernel | 6.9-rc4 | 6.9-rc4.x |
| debian / debian_linux | 10.0 | 10.0.x |
| fedoraproject / fedora | 38 | 38.x |
| fedoraproject / fedora | 39 | 39.x |
| fedoraproject / fedora | 40 | 40.x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
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