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CVE-2022-49650: dmaengine: qcom: bam_dma: fix runtime PM underflow

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-191

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: qcom: bam_dma: fix runtime PM underflow Commit dbad41e7bb5f ("dmaengine: qcom: bam_dma: check if the runtime pm enabled") caused unbalanced pm_runtime_get/put() calls when the bam is controlled remotely. This commit reverts it and just enables pm_runtime in all cases, the clk_* functions already just nop when the clock is NULL. Also clean up a bit by removing unnecessary bamclk null checks.

Affected products

• Linux kernel: from 4.17.1 before 5.15.54; from 5.16 before 5.18.11; 4.17, 4.17-rc6, 4.17-rc7, 5.19-rc1, 5.19-rc2, 5.19-rc3 (+2) — fixed in 5.15.54, 5.18.11

How to fix

Upgrade to a fixed version: Linux kernel 5.15.54, 5.18.11. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ac9c3dd0d6fe293cd5044cfad10bec27d171e4e
• https://git.kernel.org/stable/c/2f6ded79068cac8cff41d5d5632564165d98ee12
• https://git.kernel.org/stable/c/b702a1077b51fcb39507cc3bd39206f539319a96

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