Out-of-bounds read in Linux kernel bpf

1) Out-of-bounds read

EUVDB-ID: #VU92400

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3600

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to out-of-bounds read error within the fixup_bpf_calls() function in kernel/bpf/verifier.c. A local user can execute arbitrary code.

Mitigation

Install update from vendor's repository.

Vulnerable software versions

Linux kernel: 4.2 - 5.4.97

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.2.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.3.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.4.302:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.5.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.6.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.7.10:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.8.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.9.337:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.10.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.11.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.12.14:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.13.16:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.14.336:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.15.18:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.16.18:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.17.19:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.18.20:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.316:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.20.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.0.21:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.1.21:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.2.21:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.3.18:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.4.97:*:*:*:*:*:*:*

External links

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3600
http://ubuntu.com/security/notices/USN-5003-1
http://git.kernel.org/linus/e88b2c6e5a4d9ce30d75391e4d950da74bb2bd90

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.