Integer overflow in Linux kernel - CVE-2026-98242

Vulnerability identifier: #VU153773

CSH Severity: Low

CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98242

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause DMA mapping lengths to be truncated.

The vulnerability exists due to integer overflow in dma_buf_phys_vec_to_sgt() when accumulating size_t lengths in the 32-bit mapped_len variable. A local user can trigger physical-vector conversion with a total linked IOVA length greater than 4 GiB to cause DMA mapping lengths to be truncated.

The described code path requires an MMIO size greater than 4 GiB and peer-to-peer DMA passing through the host bridge. Truncated lengths are passed to functions such as fill_sg_entry().

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/6b98fd7106d4e486f432664893dcd4d6fa3a9693
• https://git.kernel.org/stable/c/b344ca94e8cc85796f16ea25e2e5a8e0303fe813

• Integer overflow in Linux kernel dma-buf driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more