SB2019082809 - Denial of service in Linux kernel
Published: August 28, 2019
Security Bulletin ID
SB2019082809
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource management error (CVE-ID: CVE-2019-15538)
The vulnerability allows a local attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to buggy implementation of quotas in "xfs_setattr_nonsize" in the "fs/xfs/xfs_iops.c" file. A local attacker can send specially crafted requests to the affected system and perform denial of service attack.
Note: This vulnerability can be exploited remotely, if XFS filesystem is exported for instance via NFS.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1fb254aa983bf190cfd685d40c64a480a9bafaee
- https://github.com/torvalds/linux/commit/1fb254aa983bf190cfd685d40c64a480a9bafaee
- https://lore.kernel.org/linux-xfs/20190823035528.GH1037422@magnolia/
- https://lore.kernel.org/linux-xfs/20190823192433.GA8736@eldamar.local