7.8

CVE-2021-47334

misc/libmasm/module: Fix two use after free in ibmasm_init_one

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

misc/libmasm/module: Fix two use after free in ibmasm_init_one

In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().
Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are
allocated by input_allocate_device(), and assigned to
sp->remote.mouse_dev and sp->remote.keybd_dev respectively.

In the err_free_devices error branch of ibmasm_init_one,
mouse_dev and keybd_dev are freed by input_free_device(), and return
error. Then the execution runs into error_send_message error branch
of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called
to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.

My patch add a "error_init_remote" label to handle the error of
ibmasm_init_remote_input_dev(), to avoid the uaf bugs.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.4.276
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.276
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.240
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.198
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.134
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.52
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.19
Linux ≫ Linux Kernel Version >= 5.13 < 5.13.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.193
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069
Patch
https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a
Patch
https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d
Patch
https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e
Patch
https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab
Patch
https://git.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9ae
Patch
https://git.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274
Patch
https://git.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3
Patch
https://git.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12c
Patch