fs: fix UAF/GPF bug in nilfs_mdt_destroy
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
fs: fix UAF/GPF bug in nilfs_mdt_destroy
In alloc_inode, inode_init_always() could return -ENOMEM if
security_inode_alloc() fails, which causes inode->i_private
uninitialized. Then nilfs_is_metadata_file_inode() returns
true and nilfs_free_inode() wrongly calls nilfs_mdt_destroy(),
which frees the uninitialized inode->i_private
and leads to crashes(e.g., UAF/GPF).
Fix this by moving security_inode_alloc just prior to
this_cpu_inc(nr_inodes)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/1e555c3ed1fce4b278aaebe18a64a934cece57d8https://git.kernel.org/stable/c/2a96b532098284ecf8e4849b8b9e5fc7a28bdee9https://git.kernel.org/stable/c/2e488f13755ffbb60f307e991b27024716a33b29https://git.kernel.org/stable/c/64b79e632869ad3ef6c098a4731d559381da1115https://git.kernel.org/stable/c/70e4f70d54e0225f91814e8610477d65f33cefe4https://git.kernel.org/stable/c/81de80330fa6907aec32eb54c5619059e6e36452https://git.kernel.org/stable/c/c0aa76b0f17f59dd9c9d3463550a2986a1d592e4https://git.kernel.org/stable/c/d1ff475d7c83289d0a7faef346ea3bbf90818badhttps://git.kernel.org/stable/c/ec2aab115eb38ac4992ea2fcc2a02fbe7af5cf48