CVE-2025-39923 (GCVE-0-2025-39923)
Vulnerability from cvelistv5
Published
2025-10-01 08:07
Modified
2025-10-02 13:26
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees
When we don't have a clock specified in the device tree, we have no way to
ensure the BAM is on. This is often the case for remotely-controlled or
remotely-powered BAM instances. In this case, we need to read num-channels
from the DT to have all the necessary information to complete probing.
However, at the moment invalid device trees without clock and without
num-channels still continue probing, because the error handling is missing
return statements. The driver will then later try to read the number of
channels from the registers. This is unsafe, because it relies on boot
firmware and lucky timing to succeed. Unfortunately, the lack of proper
error handling here has been abused for several Qualcomm SoCs upstream,
causing early boot crashes in several situations [1, 2].
Avoid these early crashes by erroring out when any of the required DT
properties are missing. Note that this will break some of the existing DTs
upstream (mainly BAM instances related to the crypto engine). However,
clearly these DTs have never been tested properly, since the error in the
kernel log was just ignored. It's safer to disable the crypto engine for
these broken DTBs.
[1]: https://lore.kernel.org/r/CY01EKQVWE36.B9X5TDXAREPF@fairphone.com/
[2]: https://lore.kernel.org/r/20230626145959.646747-1-krzysztof.kozlowski@linaro.org/
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: 48d163b1aa6e7f650c0b7a4f9c61c387a6def868 Version: cecf8a69042b3a54cb843223756c10ee8a8665e3 Version: 909474cd384cb206f33461fbd18089cf170533f8 Version: 5e0986f7caf17d7b1acd2092975360bf8e88a57d |
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|
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees\n\nWhen we don\u0027t have a clock specified in the device tree, we have no way to\nensure the BAM is on. This is often the case for remotely-controlled or\nremotely-powered BAM instances. In this case, we need to read num-channels\nfrom the DT to have all the necessary information to complete probing.\n\nHowever, at the moment invalid device trees without clock and without\nnum-channels still continue probing, because the error handling is missing\nreturn statements. The driver will then later try to read the number of\nchannels from the registers. This is unsafe, because it relies on boot\nfirmware and lucky timing to succeed. Unfortunately, the lack of proper\nerror handling here has been abused for several Qualcomm SoCs upstream,\ncausing early boot crashes in several situations [1, 2].\n\nAvoid these early crashes by erroring out when any of the required DT\nproperties are missing. Note that this will break some of the existing DTs\nupstream (mainly BAM instances related to the crypto engine). However,\nclearly these DTs have never been tested properly, since the error in the\nkernel log was just ignored. It\u0027s safer to disable the crypto engine for\nthese broken DTBs.\n\n[1]: https://lore.kernel.org/r/CY01EKQVWE36.B9X5TDXAREPF@fairphone.com/\n[2]: https://lore.kernel.org/r/20230626145959.646747-1-krzysztof.kozlowski@linaro.org/"
}
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{
"url": "https://git.kernel.org/stable/c/5068b5254812433e841a40886e695633148d362d"
}
],
"title": "dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees",
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"datePublished": "2025-10-01T08:07:11.469Z",
"dateReserved": "2025-04-16T07:20:57.147Z",
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