SB20261007107 - Incorrect calculation in Linux kernel dma

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-98254)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: 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]

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().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0219b72f5c209732b2f03a8cc0d7240b5e428a99
• https://git.kernel.org/stable/c/6e53b4d6afbde626255805d438cabb1cac482445
• https://git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1
• https://git.kernel.org/stable/c/b7d7914a9ae3097e63d113007e4fb44d33d515b1