Buffer overflow in Linux kernel

1) Buffer overflow

EUVDB-ID: #VU28400

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-12817

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

arch/powerpc/mm/mmu_context_book3s64.c in the Linux kernel before 5.1.15 for powerpc has a bug where unrelated processes may be able to read/write to one another's virtual memory under certain conditions via an mmap above 512 TB. Only a subset of powerpc systems are affected.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.0 - 5.2.21

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.8:*:*:*:*:*:*:*

External links

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3

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.