Incorrect calculation in Linux kernel - CVE-2026-98254
Published: October 7, 2026
Vulnerability identifier: #VU153762
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98254
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt memory and transfer incorrect data during DMA operations.
The vulnerability exists due to incorrect address calculations in swiotlb_bounce() when performing partial DMA synchronization. A local user can trigger a partial synchronization with an address adjustment that crosses a page boundary to corrupt memory and transfer incorrect data during DMA operations.
A recorded lowmem address that is adjusted into highmem can also cause the lowmem path to pass a highmem address to phys_to_virt().
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98254
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