CVE-2024-40998

Technical Description

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

ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()

In the following concurrency we will access the uninitialized rs->lock:

ext4_fill_super

ext4_register_sysfs

// sysfs registered msg_ratelimit_interval_ms

// Other processes modify rs->interval to

// non-zero via msg_ratelimit_interval_ms

ext4_orphan_cleanup

ext4_msg(sb, KERN_INFO, "Errors on filesystem, "

__ext4_msg

___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state)

if (!rs->interval) // do nothing if interval is 0

return 1;

raw_spin_trylock_irqsave(&rs->lock, flags)

raw_spin_trylock(lock)

_raw_spin_trylock

__raw_spin_trylock

spin_acquire(&lock->dep_map, 0, 1, _RET_IP_)

lock_acquire

__lock_acquire

regist

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References