CVE-2026-98298

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()

In mmp_pdma_prep_slave_sg(), for_each_sg() iterates the scatterlist

putting each entry into 'sg', but the entry length is read from 'sgl'

(the list head) instead of 'sg' (the current entry):

for_each_sg(sgl, sg, sg_len, i) {

addr = sg_dma_address(sg);

avail = sg_dma_len(sgl); /* should be 'sg' */

Consequently 'avail' is always the length of the first entry. For

multi-sg lists this causes out-of-bounds reads when a later entry is

shorter than the first, and silent data loss when it is longer.

Single-sg or uniformly-sized lists happen to mask the issue.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References