CVE-2026-58091
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would block, it releases the sync group list lock and sleeps. Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility. On a system with multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges.
Risk Assessment
Risk of privilege escalation by an unprivileged local user, potentially leading to full system compromise.
Recommendation
Apply the vendor patch that fixes the use-after-free in the ioctl implementation for sync groups.
Other vulnerabilities in Operating System Kernel
See all- CVE-2026-58094High
The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state. An unprivileged local user can exploit this race to escalate privileges.
- CVE-2026-58093High
The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session. An unprivileged local user can exploit this race condition to escalate privileges.
Original NVD description (English source)
The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would block, it releases the sync group list lock and sleeps. Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility. On a system with a multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges.