CVE-2025-39923In 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 ha…
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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/
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
linux linux_kernel linux:linux_kernel | from 4.9.104 before 4.10; from 4.14.45 before 4.15; from 4.16.13 before 5.4.300; from 5.5 before 5.10.245; from 5.11 before 5.15.194; from 5.16 before 6.1.153; from 6.2 before 6.6.107; from 6.7 before 6.12.48; and 6 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/0ff9df758af7022d749718fb6b8385cc5693acf3patch
- https://git.kernel.org/stable/c/1d98ba204d8a6db0d986c7f1aefaa0dcd1c007a2patch
- https://git.kernel.org/stable/c/1fc14731f0be4885e60702b9596d14d9a79cf053patch
- https://git.kernel.org/stable/c/2e257a6125c63350f00dc42b9674f20fd3cf4a9fpatch
- https://git.kernel.org/stable/c/5068b5254812433e841a40886e695633148d362dpatch
- https://git.kernel.org/stable/c/555bd16351a35c79efb029a196975a5a27f7fbc4patch
- https://git.kernel.org/stable/c/6ac1599d0e78036d9d08efc2f58c2d91f0a3ee4cpatch
- https://git.kernel.org/stable/c/ebf6c7c908e5999531c3517289598f187776124fpatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.