CVE-2025-39684: comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl()
comedi: Fix use of uninitialized memory in doinsnioctl() and doinsnlistioctl()
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.113-1Fixed in 7.2.12-1Fixed in 7.2.13-1 - Compensating control
In the Comedi driver, update do_insn_ioctl() and do_insnlist_ioctl() to zero uninitialized portions of the allocated unsigned-int sample buffer before handling each instruction, preventing uninitialized kernel data from being copied to userspace.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-39684?
CVE-2025-39684 has been rated as moderate severity due to the risk of kernel memory leaks.
How do I fix CVE-2025-39684?
To fix CVE-2025-39684, ensure that you update the Linux kernel to the latest stable version that has addressed this vulnerability.
What affected systems are vulnerable to CVE-2025-39684?
CVE-2025-39684 affects all versions of the Linux kernel that are prior to the security patch release.
What is the nature of the vulnerability in CVE-2025-39684?
CVE-2025-39684 involves the use of uninitialized memory in the 'do_insn_ioctl()' and 'do_insnlist_ioctl()' functions.
Can CVE-2025-39684 lead to data exposure?
Yes, CVE-2025-39684 can potentially lead to information disclosure through kernel memory leaks.