Use-after-free in Linux kernel

1) Use-after-free

EUVDB-ID: #VU31153

Risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2019-9003

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.20.1 - 4.20.4

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.20.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.20.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.20.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.20.4:*:*:*:*:*:*:*

External links

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=77f8269606bf95fcb232ee86f6da80886f1dfae8
https://lists.opensuse.org/opensuse-security-announce/2019-05/msg00037.html
https://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/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.