Race condition in Linux kernel - CVE-2026-74655
Published: August 24, 2026
Vulnerability identifier: #VU144838
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74655
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state management in the qcom-geni UART DMA transmit handling in drivers/tty/serial/qcom_geni_serial.c when flushing the transmit buffer during an ongoing TX DMA transfer. A local user can trigger a large write followed by TCOFLUSH to cause a denial of service.
A subsequent tcdrain call may hang indefinitely.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74655
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1