Vulnerability identifier: #VU11520
Vulnerability risk: Low
CVSSv3.1: 5.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-476
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: Linux Foundation
Description
The vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists due to improper initialization of the crc32c checksum driver when using the ext4_fill_super function, as defined in the fs/ext4/super.c source code file. A local attacker can mount a customized ext4 image, trigger NULL pointer dereference in the ext4/xattr.c:ext4_xattr_inode_hash() function and cause the service to crash.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Linux kernel: 4.0.1 - 4.0.6, 4.1 - 4.1.5, 4.2 - 4.2.6, 4.3 - 4.3.6, 4.4.0 - 4.4.111, 4.6 rc1 - 4.6.3, 4.5 - 4.5.4, 4.7 - 4.7.9, 4.8 - 4.8.12, 4.9 - 4.9.76, 4.10.0 - 4.10.15, 4.11 - 4.11.5, 4.12 - 4.12.9, 4.13 - 4.13.6, 4.14.0 - 4.14.15, 4.15 - 4.15.15
External links
http://bugzilla.kernel.org/show_bug.cgi?id=199183
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.