CVE-2026-98298

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < f448a5f5bd10d792440a1b08cf2e8f311767032daffected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < 2148db529f082d6e3ca95413bf943442f4ef30ccaffected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < d920c07aa6d89ec11afdb6976aafaee9563a5234affected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < 4a33886057e6d127555efb022879c583e966acc5affected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < 88a505330eb06128f7ce79a4c5e4832b7601b3d1affected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < bae65e4925928f77824ca0103122e2ed20ef5802affected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < 54ccc01012a240476edf641bf1a2b8bff54fe6aeaffected
LinuxLinuxc8acd6aa6bed3c0fd7898202f4ebc534db9085f2 < 075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47affected
LinuxLinux3.7affected
LinuxLinux0 < 3.7unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References