SB2019040110 - Use-after-free in Linux kernel
Published: April 1, 2019 Updated: July 17, 2020
Security Bulletin ID
SB2019040110
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) Use-after-free (CVE-ID: CVE-2019-8956)
The vulnerability allows a local authenticated user to execute arbitrary code.
In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the "sctp_sendmsg()" function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.
Remediation
Install update from vendor's website.
References
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8
- https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ba59fb0273076637f0add4311faa990a5eec27c0
- https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/
- https://support.f5.com/csp/article/K12671141
- https://usn.ubuntu.com/3930-1/
- https://usn.ubuntu.com/3930-2/