CVE-2019-8912: Use After Free
First published: Fri Feb 15 2019(Updated: )
In the Linux kernel af_alg_release() in crypto/af_alg.c neglects to set a NULL value for a certain structure member, which leads to a use-after-free (UAF) in sockfs_setattr. A local attacker can use this flaw to escalate privileges and take control of the system. Other vendors have considered this a 'network' accessible attack, this claim is unsubstantiated at this time. Note: The attack vector that allowed the use-after-free mentioned in the original report is not introduced in the Red Hat Enterprise Linux 7, 6 and 5 versions of the kernel. References: <a href="http://patchwork.ozlabs.org/patch/1042902/">http://patchwork.ozlabs.org/patch/1042902/</a> An upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9060cb719e61b685ec0102574e10337fa5f445ea">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9060cb719e61b685ec0102574e10337fa5f445ea</a>
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-alt | <0:4.14.0-115.17.1.el7a | 0:4.14.0-115.17.1.el7a |
| Linux Linux kernel | >=4.10<4.14.103 | |
| Linux Linux kernel | >=4.19<4.19.25 | |
| Linux Linux kernel | >=4.20<4.20.12 | |
| Linux Linux kernel | =5.0-rc1 | |
| Linux Linux kernel | =5.0-rc2 | |
| Linux Linux kernel | =5.0-rc3 | |
| Linux Linux kernel | =5.0-rc4 | |
| Linux Linux kernel | =5.0-rc5 | |
| Linux Linux kernel | =5.0-rc6 | |
| Linux Linux kernel | =5.0-rc7 | |
| Linux Linux kernel | =5.0-rc8 | |
| Redhat Enterprise Linux | =7.0 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =18.10 | |
| openSUSE Leap | =15.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-8912 https://nvd.nist.gov/vuln/detail/CVE-2019-8912
- https://bugzilla.redhat.com/show_bug.cgi?id=1678685
- https://access.redhat.com/errata/RHSA-2020:0174
- https://access.redhat.com/security/cve/cve-2019-8912
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00052.html
- http://patchwork.ozlabs.org/patch/1042902/
- http://www.securityfocus.com/bid/107063
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-8912
- https://usn.ubuntu.com/3930-1/
- https://usn.ubuntu.com/3930-2/
- https://usn.ubuntu.com/3931-1/
- https://usn.ubuntu.com/3931-2/
- https://launchpad.net/bugs/cve/CVE-2019-8912
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9060cb719e61b685ec0102574e10337fa5f445ea
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1678686
- https://security-tracker.debian.org/tracker/CVE-2019-8912
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8912
- https://nvd.nist.gov/vuln/detail/CVE-2019-8912
- https://ubuntu.com/security/CVE-2019-8912
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