The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade SLES:15.5
kernel-livepatch-5_14_21-150500_55_68-default
to version 1-150500.11.3.1 or higher.
Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-5_14_21-150500_55_68-default
package and not the kernel-livepatch-5_14_21-150500_55_68-default
package as distributed by SLES
.
See How to fix?
for SLES:15.5
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.