#VU93669 Buffer overflow in Linux kernel - CVE-2021-47047

Vulnerability identifier: #VU93669

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47047

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory corruption within the zynqmp_qspi_irq(), zynqmp_qspi_setuprxdma(), zynqmp_qspi_write_op(), zynqmp_qspi_exec_op() and zynqmp_qspi_probe() functions in drivers/spi/spi-zynqmp-gqspi.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/5980a3b9c933408bc22b0e349b78c3ebd7cbf880
https://git.kernel.org/stable/c/c26c026eb496261dbc0adbf606cc81989cd2038c
https://git.kernel.org/stable/c/bad5a23cf2b477fa78b85fd392736dae09a1e818
https://git.kernel.org/stable/c/126bdb606fd2802454e6048caef1be3e25dd121e

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.