Vulnerability identifier: #VU28165

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12655

CWE-ID: CWE-400

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources in "xfs_agf_verify" in "fs/xfs/libxfs/xfs_alloc.c" file. A local user can use an XFS v5 image with crafted metadata, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.6 - 5.6.10

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External links
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0c7feaf87678371c2c09b3709400be416b2dc62
http://github.com/torvalds/linux/commit/d0c7feaf87678371c2c09b3709400be416b2dc62
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ES5C6ZCMALBEBMKNNCTBSLLSYGFZG3FF/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IO5XIQSRI747P4RVVTNX7TUPEOCF4OPU/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZ2X3TM6RGRUS3KZAS26IJO5XGU7TBBR/
http://lore.kernel.org/linux-xfs/20200221153803.GP9506@magnolia/

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Q & A

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.