CVE-2026-52992
Published: June 24, 2026· Updated: Jun 24, 2026
Official Description
In the Linux kernel, the following vulnerability has been resolved:
fs/adfs: validate nzones in adfs_validate_bblk()
Reject ADFS disc records with a zero zone count during boot block
validation, before the disc record is used.
When nzones is 0, adfs_read_map() passes it to kmalloc_array(0, ...)
which returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to
dm[-1], causing an out-of-bounds write before the allocated buffer.
adfs_validate_dr0() already rejects nzones != 1 for old-format
images. Add the equivalent check to adfs_validate_bblk() for
new-format images so that a crafted image with nzones == 0 is
rejected at probe time.
Found by syzkaller.
Technical Analysis
CVE-2026-52992 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
Affected Vendors & Products
Exploit & PoC Resources
All References (8)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-52992 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts