# CVE-2022-50721: CVE-2022-50721

Status: published. Published: 2025-12-24. Updated: 2026-11-10.

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: qcom-adm: fix wrong calling convention for prep_slave_sg

The calling convention for pre_slave_sg is to return NULL on error and
provide an error log to the system. Qcom-adm instead provide error
pointer when an error occur. This indirectly cause kernel panic for
example for the nandc driver that checks only if the pointer returned by
device_prep_slave_sg is not NULL. Returning an error pointer makes nandc
think the device_prep_slave_sg function correctly completed and makes
the kernel panics later in the code.

While nandc is the one that makes the kernel crash, it was pointed out
that the real problem is qcom-adm not following calling convention for
that function.

To fix this, drop returning error pointer and return NULL with an error
log.

## Remediation

No remediation reported in collected sources

## Affected products and versions

Not reported in collected sources.

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/5653bd0200944e5803fa8e32dc36aa49931312f9 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/9a041174c58a226e713f6cebd41eccec7a5cfa72 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b9d2140c3badf4107973ad77c5a0ec3075705c85 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-50721; retrieved 2026-11-10; source updated 2026-11-10

Revision: ac3e18eabaf5c0e6437b4326f574d8a691e3af040a89476ef8a64327d27b3ee9

Canonical: https://y2.dev/cve/CVE-2022-50721

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