SB2021060428 - Out-of-bounds read in Linux kernel bpf
Published: June 4, 2021
Security Bulletin ID
SB2021060428
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2021-3489)
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to an out-of-bounds read error within the __bpf_ringbuf_reserve() function in kernel/bpf/ringbuf.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's website.
References
- https://www.zerodayinitiative.com/advisories/ZDI-21-590/
- https://ubuntu.com/security/notices/USN-4949-1
- https://ubuntu.com/security/notices/USN-4950-1
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea
- https://www.openwall.com/lists/oss-security/2021/05/11/10
- https://security.netapp.com/advisory/ntap-20210716-0004/