Attacker Value
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0

CVE-2024-40900

Disclosure Date: July 12, 2024 •
CVE-2024-40900
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Description

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

cachefiles: remove requests from xarray during flushing requests

Even with CACHEFILES_DEAD set, we can still read the requests, so in the
following concurrency the request may be used after it has been freed:

 mount  |   daemon_thread1    |    daemon_thread2

cachefiles_ondemand_init_object
cachefiles_ondemand_send_req
REQ_A = kzalloc(sizeof(*req) + data_len)
wait_for_completion(&REQ_A->done)

        cachefiles_daemon_read
         cachefiles_ondemand_daemon_read
                              // close dev fd
                              cachefiles_flush_reqs
                               complete(&REQ_A->done)

kfree(REQ_A)

          xa_lock(&cache->reqs);
          cachefiles_ondemand_select_req
            req->msg.opcode != CACHEFILES_OP_READ
            // req use-after-free !!!
          xa_unlock(&cache->reqs);
                               xa_destroy(&cache->reqs)

Hence remove requests from cache->reqs when flushing them to avoid
accessing freed requests.

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CVSS V3 Severity and Metrics
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
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Vector:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Scope (S):
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Confidentiality (C):
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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 9f13aacdd4ee
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
Unknown
Metasploit Module
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Reporter
Unknown

Vendors

  • Linux

Products

  • Linux
Technical Analysis