CVE-2024-56755

/// Technical description

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

netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING

In fscache_create_volume(), there is a missing memory barrier between the

bit-clearing operation and the wake-up operation. This may cause a

situation where, after a wake-up, the bit-clearing operation hasn't been

detected yet, leading to an indefinite wait. The triggering process is as

follows:

[cookie1] [cookie2] [volume_work]

fscache_perform_lookup

fscache_create_volume

fscache_perform_lookup

fscache_create_volume

fscache_create_volume_work

cachefiles_acquire_volume

clear_and_wake_up_bit

test_and_set_bit

test_and_set_bit

goto maybe_wait

goto no_wait

In the above process, co

/// 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