In the Linux kernel, the following vulnerability has been resolved:
erofs: fix interlaced ztailpacking pclusters
On-disk sizes of interlaced pclusters should be block-aligned, and
ztailpacking interlaced pclusters should be invalid at all.
Currently, mkfs.erofs won't generate any interlaced pcluster with
ztailpacking enabled, so this doesn't affect any existing valid
filesystems.
However, crafted images can contain invalid interlaced ztailpacking
pclusters, resulting in an out-of-bounds read from a kmap'd page and
copying irrelevant kernel memory into userspace-visible page cache.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 3
https://git.kernel.org/stable/c/451027c642e752420e1a04237db9ce7b35cee595
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/862427ebb81d1f6abbf74d799790e1694b37b187
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/ddb7ea4fd99bf6c4314d1dfca18aec6945ce8054
416baaa9-dc9f-4396-8d5f-8c081fb06d67