Use-after-free in Linux kernel - CVE-2019-9003

Vulnerability identifier: #VU31153

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-9003

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

In the Linux kernel before 4.20.5, attackers can trigger a drivers/char/ipmi/ipmi_msghandler.c use-after-free and OOPS by arranging for certain simultaneous execution of the code, as demonstrated by a "service ipmievd restart" loop.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-azure (Ubuntu package)

Install update from vendor's website.

Linux kernel - update to 4.20.5
linux (Ubuntu package) - update to 4.18.0-17.18
linux-gcp (Ubuntu package) - update to 4.18.0-1008.9
linux-aws (Ubuntu package) - update to 4.18.0-1012.14
linux-kvm (Ubuntu package) - update to 4.18.0-1009.9
linux-azure (Ubuntu package) - update to 4.18.0-1014.14

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=77f8269606bf95fcb232ee86f6da80886f1dfae8
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00037.html
• http://www.securityfocus.com/bid/107145
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.5
• https://github.com/torvalds/linux/commit/77f8269606bf95fcb232ee86f6da80886f1dfae8
• https://security.netapp.com/advisory/ntap-20190327-0002/
• https://usn.ubuntu.com/3930-1/
• https://usn.ubuntu.com/3930-2/

• Use-after-free in Linux kernel
• Ubuntu update for linux, linux-aws, linux-azure and more