CVE-2022-50269: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vkms: Fix memory leak in vkms_init() A memory leak was reported after the vkms module install failed. unreferenced object 0xffff88810bc28520 (size 16): comm "modprobe", pid 9662, jiffies 4298009455 (age 42.590s) hex dump (first 16 bytes): 01 01 00 64 81 88 ff ff 00 00 dc 0a 81 88 ff ff ...d............ backtrace: [<00000000e7561ff8>] kmalloc_trace+0x27/0x60 [<000000000b1954a0>] 0xffffffffc45200a9 [<00000000abbf1da0>] do_one_initcall+0xd0/0x4f0 [<000000001505ee87>] do_init_module+0x1a4/0x680 [<00000000958079ad>] load_module+0x6249/0x7110 [<00000000117e4696>] __do_sys_finit_module+0x140/0x200 [<00000000f74b12d2>] do_syscall_64+0x35/0x80 [<000000008fc6fcde>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The reason is that the vkms_init() returns without checking the return value of vkms_create(), and if the vkms_create() failed, the config allocated at the beginning of vkms_init() is leaked. vkms_init() config = kmalloc(...) # config allocated ... return vkms_create() # vkms_create failed and config is leaked Fix this problem by checking return value of vkms_create() and free the config if error happened.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.12 — 5.15.99
linux	linux_kernel	5.16 — 6.1.16
linux	linux_kernel	6.2 — 6.2.3

References

Advisories & Patches

https://git.kernel.org/stable/c/07ab77154d6fd2d67e465ab5ce30083709950f02 https://git.kernel.org/stable/c/0d0b368b9d104b437e1f4850ae94bdb9a3601e89 https://git.kernel.org/stable/c/bad13de764888b765ceaa4668893b52bd16653cc https://git.kernel.org/stable/c/bebd60ec3bf21062f103e32e6203c6daabdbd51b

Frequently Asked Questions

What is CVE-2022-50269? +

In the Linux kernel, the following vulnerability has been resolved: drm/vkms: Fix memory leak in vkms_init() A memory leak was reported after the vkms module install failed. unreferenced object 0xffff88810bc28520 (size 16): comm "modprobe", pid 9662, jiffies 4298009455 (age 42.590s) hex dump (first 16 bytes): 01 01 00 64 81 88 ff ff 00 00 dc 0a 81 88 ff ff ...d............ backtrace: [<00000000e7561ff8>] kmalloc_trace+0x27/0x60 [<000000000b1954a0>] 0xffffffffc45200a9 [<00000000abbf1da0>] do_one_initcall+0xd0/0x4f0 [<000000001505ee87>] do_init_module+0x1a4/0x680 [<00000000958079ad>] load_module+0x6249/0x7110 [<00000000117e4696>] __do_sys_finit_module+0x140/0x200 [<00000000f74b12d2>] do_syscall_64+0x35/0x80 [<000000008fc6fcde>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The reason is that the vkms_init() returns without checking the return value of vkms_create(), and if the vkms_create() failed, the config allocated at the beginning of vkms_init() is leaked. vkms_init() config = kmalloc(...) # config allocated ... return vkms_create() # vkms_create failed and config is leaked Fix this problem by checking return value of vkms_create() and free the config if error happened. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50269? +

CVE-2022-50269 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-50269? +

CVE-2022-50269 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50269? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2022-50269