An issue was discovered in xfs_setattr_nonsize in fs/xfs/xfs_iops.c in the Linux kernel through 5.2.9. XFS partially wedges when a chgrp fails on account of being out of disk quota. xfs_setattr_nonsize is failing to unlock the ILOCK after the xfs_qm_vop_chown_reserve call fails. This is primarily a local DoS attack vector, but it might result as well in remote DoS if the XFS filesystem is exported for instance via NFS.
4.15.0-1051.53~16.04.14.15.0-1060.654.15.0-1046.494.15.0-65.74~16.04.14.15.0-1026.29~16.04.14.15.0-65.744.15.0-1051.535.0.0-1022.23~18.04.15.0.0-1020.20~18.04.14.15.0-1045.48Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H