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CVE-2024-41051

Disclosure Date: July 29, 2024 •
CVE-2024-41051
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Description

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

cachefiles: wait for ondemand_object_worker to finish when dropping object

When queuing ondemand_object_worker() to re-open the object,
cachefiles_object is not pinned. The cachefiles_object may be freed when
the pending read request is completed intentionally and the related
erofs is umounted. If ondemand_object_worker() runs after the object is
freed, it will incur use-after-free problem as shown below.

process A processs B process C process D

cachefiles_ondemand_send_req()
// send a read req X
// wait for its completion

       // close ondemand fd
       cachefiles_ondemand_fd_release()
       // set object as CLOSE

                   cachefiles_ondemand_daemon_read()
                   // set object as REOPENING
                   queue_work(fscache_wq, &info->ondemand_work)

                            // close /dev/cachefiles
                            cachefiles_daemon_release
                            cachefiles_flush_reqs
                            complete(&req->done)

// read req X is completed
// umount the erofs fs
cachefiles_put_object()
// object will be freed
cachefiles_ondemand_deinit_obj_info()
kmem_cache_free(object)

                   // both info and object are freed
                   ondemand_object_worker()

When dropping an object, it is no longer necessary to reopen the object,
so use cancel_work_sync() to cancel or wait for ondemand_object_worker()
to finish.

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CVSS V3 Severity and Metrics
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Impact Score:
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Vector:
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Attack Vector (AV):
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Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux ec9289369259
Linux d3179bae72b1
Linux b26525b21836
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
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Metasploit Module
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Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis