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

Summary

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.

Timeline

1. Oct 6, 2026, 8:45 AM UTCCVE published
2. Oct 19, 2026, 9:17 AM UTCRecord last updated

Affected versions

• Linux Linux

  From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in f448a5f5bd10d792440a1b08cf2e8f311767032d; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in 2148db529f082d6e3ca95413bf943442f4ef30cc; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in d920c07aa6d89ec11afdb6976aafaee9563a5234; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in 4a33886057e6d127555efb022879c583e966acc5; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in 88a505330eb06128f7ce79a4c5e4832b7601b3d1; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in bae65e4925928f77824ca0103122e2ed20ef5802; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in 54ccc01012a240476edf641bf1a2b8bff54fe6ae; From c8acd6aa6bed3c0fd7898202f4ebc534db9085f2 · fixed in 075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47

• Linux Linux

  3.7

• KernelLinux

  From 3.7.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8