CVE-2024-39510

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Source
https://nvd.nist.gov/vuln/detail/CVE-2024-39510
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-39510.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-39510
Downstream
Related
Published
2024-07-12T12:20:40.901Z
Modified
2025-11-15T23:43:44.235675Z
Summary
cachefiles: fix slab-use-after-free in cachefiles_ondemand_daemon_read()
Details

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

cachefiles: fix slab-use-after-free in cachefilesondemanddaemon_read()

We got the following issue in a fuzz test of randomly issuing the restore command:

================================================================== BUG: KASAN: slab-use-after-free in cachefilesondemanddaemon_read+0xb41/0xb60 Read of size 8 at addr ffff888122e84088 by task ondemand-04-dae/963

CPU: 13 PID: 963 Comm: ondemand-04-dae Not tainted 6.8.0-dirty #564 Call Trace: kasanreport+0x93/0xc0 cachefilesondemanddaemonread+0xb41/0xb60 vfsread+0x169/0xb50 ksysread+0xf5/0x1e0

Allocated by task 116: kmemcachealloc+0x140/0x3a0 cachefileslookupcookie+0x140/0xcd0 fscachecookiestate_machine+0x43c/0x1230 [...]

Freed by task 792: kmemcachefree+0xfe/0x390 cachefilesputobject+0x241/0x480 fscachecookiestate_machine+0x5c8/0x1230

[...]

Following is the process that triggers the issue:

mount | daemonthread1 | daemonthread2

cachefileswithdrawcookie cachefilesondemandcleanobject(object) cachefilesondemandsendreq REQA = kzalloc(sizeof(*req) + datalen) waitforcompletion(&REQ_A->done)

        cachefiles_daemon_read
         cachefiles_ondemand_daemon_read
          REQ_A = cachefiles_ondemand_select_req
          msg->object_id = req->object->ondemand->ondemand_id
                              ------ restore ------
                              cachefiles_ondemand_restore
                              xas_for_each(&xas, req, ULONG_MAX)
                               xas_set_mark(&xas, CACHEFILES_REQ_NEW)

                              cachefiles_daemon_read
                               cachefiles_ondemand_daemon_read
                                REQ_A = cachefiles_ondemand_select_req
          copy_to_user(_buffer, msg, n)
           xa_erase(&cache->reqs, id)
           complete(&REQ_A->done)
          ------ close(fd) ------
          cachefiles_ondemand_fd_release
           cachefiles_put_object

cachefilesputobject kmemcachefree(cachefilesobjectjar, object) REQA->object->ondemand->ondemandid // object UAF !!!

When we see the request within xalock, req->object must not have been freed yet, so grab the reference count of object before xaunlock to avoid the above issue.

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f17443d52d805c9a7fab5e67a4e8b973626fe1cd
Fixed
cb55625f8eb9d2de8be4da0c4580d48cbb32058e
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f740fd943bb1fbf79b7eaba3c71eb7536f437f51
Fixed
3958679c49152391209b32be3357193300a51abd
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0a7e54c1959c0feb2de23397ec09c7692364313e
Fixed
93064676a2820420a2d37d7c8289f277fe20793d
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0a7e54c1959c0feb2de23397ec09c7692364313e
Fixed
da4a827416066191aafeeccee50a8836a826ba10

Affected versions

v6.*

v6.7
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
v6.9.1
v6.9.2
v6.9.3
v6.9.4
v6.9.5

Database specific

vanir_signatures

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        "target": {
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]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.8.0
Fixed
6.9.6