# CVE-2021-4441: linux: In the Linux kernel, the following vulnerability has been resolved:  spi: spi-zynq-qspi: Fix a NULL pointer dereferen...

CVE-2021-4441 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4441, released August 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-4441
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()  In zynq_qspi_exec_mem_op(), kzalloc() is directly used in memset(), which could lead to a NULL pointer dereference on failure of kzalloc().  Fix this bug by adding a check of tmpbuf.  This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs.  Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug.  Builds with CONFIG_SPI_ZYNQ_QSPI=m show no new warnings, and our static analyzer no longer warns about this code.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.12-1 | [DEBIAN-CVE-2021-4441](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4441.md) | Aug 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.12-1 | [DEBIAN-CVE-2021-4441](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4441.md) | Aug 22, 2024 |
| Linux | linux Debian 14 | 5.16.12-1 | [DEBIAN-CVE-2021-4441](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4441.md) | Aug 22, 2024 |

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