CVE-2023-52879
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-52879
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52879.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-52879
- Downstream
- Related
- Published
- 2024-05-21T15:32:11Z
- Modified
- 2025-10-21T15:46:28.943611Z
- Summary
- tracing: Have trace_event_file have ref counters
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
tracing: Have traceeventfile have ref counters
The following can crash the kernel:
# cd /sys/kernel/tracing # echo 'p:sched schedule' > kprobeevents # exec 5>>events/kprobes/sched/enable # > kprobeevents # exec 5>&-
The above commands:
- Change directory to the tracefs directory
- Create a kprobe event (doesn't matter what one)
- Open bash file descriptor 5 on the enable file of the kprobe event
- Delete the kprobe event (removes the files too)
- Close the bash file descriptor 5
The above causes a crash!
BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tracingreleasefiletr+0xc/0x50
What happens here is that the kprobe event creates a traceeventfile "file" descriptor that represents the file in tracefs to the event. It maintains state of the event (is it enabled for the given instance?). Opening the "enable" file gets a reference to the event "file" descriptor via the open file descriptor. When the kprobe event is deleted, the file is also deleted from the tracefs system which also frees the event "file" descriptor.
But as the tracefs file is still opened by user space, it will not be totally removed until the final dput() is called on it. But this is not true with the event "file" descriptor that is already freed. If the user does a write to or simply closes the file descriptor it will reference the event "file" descriptor that was just freed, causing a use-after-free bug.
To solve this, add a ref count to the event "file" descriptor as well as a new flag called "FREED". The "file" will not be freed until the last reference is released. But the FREE flag will be set when the event is removed to prevent any more modifications to that event from happening, even if there's still a reference to the event "file" descriptor.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706
- https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976
- https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d
- https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e
- https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f
- https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4
- https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0
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
-
Introducede6807c873d8791ae5a5186ad05ec66cab926539aFixed961c4511c7578d6b8f39118be919016ec3db1c1e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced407bf1c140f0757706c0b28604bcc90837d45ce2Fixeda98172e36e5f1b3d29ad71fade2d611cfcc2fe6f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedfa6d449e4d024d8c17f4288e0567d28ace69415cFixedcbc7c29dff0fa18162f2a3889d82eeefd67305e0
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceda46bf337a20f9edd3c8041b025639842280d0575Fixed2fa74d29fc1899c237d51bf9a6e132ea5c488976
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9beec04370132a7a6cd1aa9897f6fffc6262ff28Fixed2c9de867ca285c397cd71af703763fe416265706
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf5ca233e2e66dc1c249bf07eefa37e34a6c9346aFixed9034c87d61be8cff989017740a91701ac8195a1d
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf5ca233e2e66dc1c249bf07eefa37e34a6c9346aFixedbb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4
Affected versions
v5.*
v5.10.198
v5.10.199
v5.10.200
v5.10.201
v5.15.134
v5.15.135
v5.15.136
v5.15.137
v5.15.138
v5.15.139
v5.4.258
v5.4.259
v5.4.260
v5.4.261
v6.*
v6.1.55
v6.1.56
v6.1.57
v6.1.58
v6.1.59
v6.1.60
v6.1.61
v6.1.62
v6.1.63
v6.5.10
v6.5.11
v6.5.12
v6.5.5
v6.5.6
v6.5.7
v6.5.8
v6.5.9
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
Database specific
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Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.4.262
- Type
- ECOSYSTEM
- Events
-
Introduced5.5.0Fixed5.10.202
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed5.15.140
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.1.64
- Type
- ECOSYSTEM
- Events
-
Introduced6.2.0Fixed6.5.13
- Type
- ECOSYSTEM
- Events
-
Introduced6.6.0Fixed6.6.1