UnratedFix available
dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees
Type: advisorySources: OSV
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/
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.245, 5.15.194, 5.4.300, 6.1.153, 6.12.48, 6.16.8, 6.6.107
- CVEs
- CVE-2025-39923
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 04:12 UTC · Revision 1
Source evidence
dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees
core-osv · Original sourcePublished 1 Oct 2025, 08:07 UTC
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/
osv:CVE-2025-39923
Kernel
Fixed versions: 5.4.300, 5.10.245, 5.15.194, 6.1.153, 6.6.107, 6.12.48, 6.16.8
Complete source record
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"title": "dmaengine: qcom: bam_dma: Fix DT error handling for num-channels/ees",
"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/",
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],
"modified": "2026-10-28T02:30:49.438764440Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0ff9df758af7022d749718fb6b8385cc5693acf3",
"https://git.kernel.org/stable/c/1d98ba204d8a6db0d986c7f1aefaa0dcd1c007a2",
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"https://git.kernel.org/stable/c/2e257a6125c63350f00dc42b9674f20fd3cf4a9f",
"https://git.kernel.org/stable/c/5068b5254812433e841a40886e695633148d362d",
"https://git.kernel.org/stable/c/555bd16351a35c79efb029a196975a5a27f7fbc4",
"https://git.kernel.org/stable/c/6ac1599d0e78036d9d08efc2f58c2d91f0a3ee4c",
"https://git.kernel.org/stable/c/ebf6c7c908e5999531c3517289598f187776124f",
"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39923.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-39923",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
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"value": "CVE-2025-39923",
"evidence": "/id"
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"source_id": "core-osv",
"document_id": 518033,
"published_at": "2025-10-01T08:07:11.469+00:00"
}