CVE-2025-37741

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

jfs: Prevent copying of nlink with value 0 from disk inode

syzbot report a deadlock in diFree. [1]

When calling "ioctl$LOOP_SET_STATUS64", the offset value passed in is 4,

which does not match the mounted loop device, causing the mapping of the

mounted loop device to be invalidated.

When creating the directory and creating the inode of iag in diReadSpecial(),

read the page of fixed disk inode (AIT) in raw mode in read_metapage(), the

metapage data it returns is corrupted, which causes the nlink value of 0 to be

assigned to the iag inode when executing copy_from_dinode(), which ultimately

causes a deadlock when entering diFree().

To avoid this, first check the nlink value of dinode before setting iag inode.

[1]

WARNING: possible recursive locking detected

6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Not tainted

--------------------------------------------

syz-executor301/5309 is trying to acquire lock:

ffff88804454

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References