CVE-2019-8956: Use After Free
First published: Mon Apr 01 2019(Updated: )
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.
Credit: PSIRT-CNA@flexerasoftware.com PSIRT-CNA@flexerasoftware.com PSIRT-CNA@flexerasoftware.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.17<4.19.21 | |
| Linux Kernel | >=4.20<4.20.8 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Linux | =18.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 | |
| Ubuntu | =18.04 | |
| Ubuntu | =18.10 |
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Reference Links
- 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/
- https://launchpad.net/bugs/cve/CVE-2019-8956
- https://git.kernel.org/linus/ba59fb0273076637f0add4311faa990a5eec27c0
- https://security-tracker.debian.org/tracker/CVE-2019-8956
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8956
- https://nvd.nist.gov/vuln/detail/CVE-2019-8956
- https://ubuntu.com/security/CVE-2019-8956
Frequently Asked Questions
What is CVE-2019-8956?
CVE-2019-8956 is a vulnerability in the Linux Kernel that allows for a use-after-free error in the "sctp_sendmsg()" function when handling SCTP_SENDALL flag, which can be exploited to corrupt memory.
What is the severity of CVE-2019-8956?
The severity of CVE-2019-8956 is not provided.
How can I exploit CVE-2019-8956?
Details on how to exploit CVE-2019-8956 are not provided.
How do I fix CVE-2019-8956?
To fix CVE-2019-8956, update your Linux Kernel to versions 4.20.8 or 4.19.21.
Where can I find more information about CVE-2019-8956?
You can find more information about CVE-2019-8956 at the following references: [1] [2] [3]
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