Memory leak in Linux kernel - CVE-2026-98208
Published: October 7, 2026
Vulnerability identifier: #VU153806
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98208
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to consume kernel memory through a transmit FIFO leak.
The vulnerability exists due to failure to release allocated memory in sdio_uart_add_port() when attempting to add a port after all UART_NR slots in sdio_uart_table[] are occupied. A local user can trigger a port-addition attempt with a full port table to consume kernel memory through a transmit FIFO leak.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98208
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1
External References
- https://git.kernel.org/stable/c/53823e25793a97d07e6e98e0904bbf74cac8bc76
- https://git.kernel.org/stable/c/5e142adbbdc54afbd01fad476c91cded41d22594
- https://git.kernel.org/stable/c/72f4c2b7a48423c708f2c348585419a1b71ab04c
- https://git.kernel.org/stable/c/8a2c1bf209ba04cbd14153a771724bd5aa522fcd
- https://git.kernel.org/stable/c/9e992d59138fcfaa4bad7cc0750265b0a8bca100
- https://git.kernel.org/stable/c/ac866db277a4c73e84b4263773652e3aba326249
- https://git.kernel.org/stable/c/b97b5b66c93cb4aaf6358727a73fff880a774dfd
- https://git.kernel.org/stable/c/fd8223c53ad9553b2a349d2a40e19bbc6e60fc48