CVE-2024-35955 Affecting kernel-rt-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTKVM-6961400
- published 21 May 2024
- disclosed 20 May 2024
How to fix?
There is no fixed version for Centos:7 kernel-rt-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
kprobes: Fix possible use-after-free issue on kprobe registration
When unloading a module, its state is changing MODULE_STATE_LIVE ->
MODULE_STATE_GOING -> MODULE_STATE_UNFORMED. Each change will take
a time. is_module_text_address() and __module_text_address()
works with MODULE_STATE_LIVE and MODULE_STATE_GOING.
If we use is_module_text_address() and __module_text_address()
separately, there is a chance that the first one is succeeded but the
next one is failed because module->state becomes MODULE_STATE_UNFORMED
between those operations.
In check_kprobe_address_safe(), if the second __module_text_address()
is failed, that is ignored because it expected a kernel_text address.
But it may have failed simply because module->state has been changed
to MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify
non-exist module text address (use-after-free).
To fix this problem, we should not use separated is_module_text_address()
and __module_text_address(), but use only __module_text_address()
once and do try_module_get(module) which is only available with
MODULE_STATE_LIVE.
References
- https://access.redhat.com/security/cve/CVE-2024-35955
- https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2e
- https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8
- https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0
- https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26d
- https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808
- https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412
- https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33
- https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2f