Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.2, < 5.4.182 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/2efece1368aeee2d2552c7ec36aeb676c4d4c95fPatch
- https://git.kernel.org/stable/c/3c32405d6474a21f7d742828e73c13e326dcae82Patch
- https://git.kernel.org/stable/c/ab3824427b848da10e9fe2727f035bbeecae6ff4Patch
- https://git.kernel.org/stable/c/b9dd08cbebe0c593c49bf86d2012a431494e54cbPatch
- https://git.kernel.org/stable/c/df14d2bed8e2455878e046e67123d9ecb2e79056Patch
FAQ
What is CVE-2021-4441?
CVE-2021-4441 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 us...
How severe is CVE-2021-4441?
CVE-2021-4441 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-4441?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.