high
7.8
CWE
416
Advisory Published
CVE Published
Updated

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 SoftwareAffected VersionHow to fix
redhat/kernel-alt<0:4.14.0-115.17.1.el7a
0:4.14.0-115.17.1.el7a
Linux Kernel>=4.10<4.14.103
Linux Kernel>=4.19<4.19.25
Linux Kernel>=4.20<4.20.12
Linux Kernel=5.0-rc1
Linux Kernel=5.0-rc2
Linux Kernel=5.0-rc3
Linux Kernel=5.0-rc4
Linux Kernel=5.0-rc5
Linux Kernel=5.0-rc6
Linux Kernel=5.0-rc7
Linux Kernel=5.0-rc8
Red Hat Enterprise Linux=7.0
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=18.10
SUSE Linux=15.0
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.17-1

Remedy

http://patchwork.ozlabs.org/patch/1042902/

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-8912

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2019-8912?

    CVE-2019-8912 has a high severity rating as it allows local attackers to escalate privileges.

  • How do I fix CVE-2019-8912?

    To mitigate CVE-2019-8912, update to the appropriate kernel version that contains the fix, such as 5.10.223-1 or later.

  • What systems are affected by CVE-2019-8912?

    CVE-2019-8912 affects various Linux kernel versions including those up to 5.0-rc8 and specific distributions like Red Hat and Ubuntu.

  • Can CVE-2019-8912 be exploited remotely?

    No, CVE-2019-8912 can only be exploited by local attackers with access to the system.

  • Is there a workaround for CVE-2019-8912?

    There are no specific workarounds for CVE-2019-8912, so applying the latest updates is recommended.

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