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CVE-2026-98298: dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

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.

Affected products

• Linux kernel: 3.7 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47
• https://git.kernel.org/stable/c/2148db529f082d6e3ca95413bf943442f4ef30cc
• https://git.kernel.org/stable/c/4a33886057e6d127555efb022879c583e966acc5
• https://git.kernel.org/stable/c/54ccc01012a240476edf641bf1a2b8bff54fe6ae
• https://git.kernel.org/stable/c/88a505330eb06128f7ce79a4c5e4832b7601b3d1
• https://git.kernel.org/stable/c/bae65e4925928f77824ca0103122e2ed20ef5802
• https://git.kernel.org/stable/c/d920c07aa6d89ec11afdb6976aafaee9563a5234
• https://git.kernel.org/stable/c/f448a5f5bd10d792440a1b08cf2e8f311767032d

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