CVE-2019-3896: Use After Free
First published: Mon Apr 01 2019(Updated: )
A double-free can happen in idr_remove_all() in lib/idr.c in the Linux kernel 2.6 branch. An unprivileged local attacker can use this flaw for a privilege escalation or for a system crash and a denial of service (DoS).
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:2.6.32-754.15.3.el6 | 0:2.6.32-754.15.3.el6 |
| redhat/kernel | <0:2.6.32-431.95.3.el6 | 0:2.6.32-431.95.3.el6 |
| redhat/kernel | <0:2.6.32-504.79.3.el6 | 0:2.6.32-504.79.3.el6 |
| Linux Linux kernel | >=2.6.0<=2.6.39.4 | |
| Redhat Enterprise Linux Desktop | =6.0 | |
| Redhat Enterprise Linux Server | =6.0 | |
| Redhat Enterprise Linux Server Aus | =6.5 | |
| Redhat Enterprise Linux Server Aus | =6.6 | |
| Redhat Enterprise Linux Workstation | =6.0 |
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Reference Links
- http://www.securityfocus.com/bid/108814
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3896
- https://security.netapp.com/advisory/ntap-20190710-0002/
- https://support.f5.com/csp/article/K04327111
- https://marc.info/?t=127366612300001&r=1&w=2
- https://marc.info/?l=linux-kernel&m=127422151819010&w=2
- https://lore.kernel.org/patchwork/patch/205534/
- https://marc.info/?t=136035740900005&r=1&w=2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2dcb22b346be
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=326cf0f0f308
- https://access.redhat.com/errata/RHSA-2019:1488
- https://access.redhat.com/errata/RHSA-2019:1489
- https://access.redhat.com/errata/RHSA-2019:1490
- https://access.redhat.com/security/cve/cve-2019-3896
- https://bugzilla.redhat.com/show_bug.cgi?id=1694812
- https://www.cve.org/CVERecord?id=CVE-2019-3896 https://nvd.nist.gov/vuln/detail/CVE-2019-3896
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2019-3896?
CVE-2019-3896 is a vulnerability in the Linux kernel that allows an unprivileged local attacker to escalate privileges or cause a denial of service.
How does CVE-2019-3896 affect Linux kernel 2.6?
CVE-2019-3896 affects the Linux kernel 2.6 branch, specifically versions 2.6.32-754.15.3.el6, 2.6.32-431.95.3.el6, and 2.6.32-504.79.3.el6.
What is the severity of CVE-2019-3896?
CVE-2019-3896 has a severity rating of high.
How can an attacker exploit CVE-2019-3896?
An attacker can exploit CVE-2019-3896 by using a double-free vulnerability in idr_remove_all() in lib/idr.c to escalate privileges or cause a system crash and denial of service (DoS).
Are there any patches or fixes available for CVE-2019-3896?
Yes, patches for CVE-2019-3896 are available. It is recommended to update to the latest version of the Linux kernel to fix this vulnerability.
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