UBUNTU-CVE-2025-40317: Medium severity ubuntu/linux-hwe-edge vulnerability
In the Linux kernel, the following vulnerability has been resolved: regmap: slimbus: fix buscontext pointer in regmap init calls Commit 4e65bda8273c ("ASoC: wcd934x: fix error handling in wcd934xcodecparsedata()") revealed the problem in the slimbus regmap. That commit breaks audio playback, for instance, on sdm845 Thundercomm Dragonboard 845c board: Unable to handle kernel paging request at virtual address ffff8000847cbad4 ... CPU: 5 UID: 0 PID: 776 Comm: aplay Not tainted 6.18.0-rc1-00028-g7ea30958b305 #11 PREEMPT Hardware name: Thundercomm Dragonboard 845c (DT) ... Call trace: slimxfermsg+0x24/0x1ac [slimbus] (P) slimread+0x48/0x74 [slimbus] regmapslimbusread+0x18/0x24 [regmapslimbus] regmaprawread+0xe8/0x174 regmapbusread+0x44/0x80 regmapread+0x60/0xd8 regmapupdatebits+0xf4/0x140 regmapselectpage+0xa8/0x124 regmaprawwriteimpl+0x3b8/0x65c regmapbusrawwrite+0x60/0x80 regmapwrite+0x58/0xc0 regmapwrite+0x4c/0x80 wcd934xhwparams+0x494/0x8b8 [sndsocwcd934x] sndsocdaihwparams+0x3c/0x7c [sndsoccore] socpcmhwparams+0x22c/0x634 [sndsoccore] dpcmbedaihwparams+0x1d4/0x38c [sndsoccore] dpcmfedaihwparams+0x9c/0x17c [sndsoccore] sndpcmhwparams+0x124/0x464 [sndpcm] sndpcmcommonioctl+0x110c/0x1820 [sndpcm] sndpcmioctl+0x34/0x4c [sndpcm] arm64sysioctl+0xac/0x104 invokesyscall+0x48/0x104 el0svccommon.constprop.0+0x40/0xe0 doel0svc+0x1c/0x28 el0svc+0x34/0xec el0t64synchandler+0xa0/0xf0 el0t64sync+0x198/0x19c The devmregmapinitslimbus() started to be used instead of regmapinitslimbus() after the commit mentioned above and turns out the incorrect buscontext pointer (3rd argument) was used in devmregmapinitslimbus(). It should be just "slimbus" (which is equal to &slimbus->dev). Correct it. The wcd934x codec seems to be the only or the first user of devmregmapinitslimbus() but we should fix it till the point where devmregmapinitslimbus() was introduced therefore two "Fixes" tags. While at this, also correct the same argument in regmapinitslimbus().
Affected Software
Remediation
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.17.0-14.14 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 6.17.0-14.14.1 - Configuration
Change the third argument of both __devm_regmap_init_slimbus() and __regmap_init_slimbus() to "slimbus" (equivalent to &slimbus->dev).
Linux kernel Slimbus regmap initialization bus_context pointer (third argument) = slimbus