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 applicationsThere is no fixed version for RHEL:10 kernel-rt-64k-modules-core.
Note: Versions mentioned in the description apply only to the upstream kernel-rt-64k-modules-core package and not the kernel-rt-64k-modules-core package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
x86/mm/pat: Acquire init_mm write lock on collapse to avoid UAF
x86 implements page attribute modification using its Change Page Attributes (CPA) mechanism.
This tracks properties of ranges such as cache mode through x86 page attributes, and as part of that logic manipulates kernel page tables.
Since commit:
41d88484c71c ("x86/mm/pat: restore large ROX pages after fragmentation")
ranges of kernel page table entries can be collapsed into huge page table entries as part of this logic.
As part of this collapse, it frees the page tables which the collapsed entries previously pointed to, and it does so without any relevant locks being held to preclude concurrent kernel page table walkers.
The only way this code can be reached is if CPA_COLLAPSE is specified, and this is only set in set_memory_rox() via:
set_memory_rox() -> change_page_attr_set_clr() -> cpa_flush() -> cpa_collapse_large_pages()
Notable users of this are execmem and BPF when manipulating executable mappings.
However, this is problematic for ptdump as it walks ranges it does not own and thus runs the risk of a use-after-free on page tables freed underneath it.
In addition, concurrent CPA collapse operations are possible which can also cause races.
Resolve the issue by acquiring the mmap write lock on init_mm across the whole operation.
It is safe to acquire a sleeping lock as all the callers invoke set_memory_rox() from process context and in any case, change_page_attr_set_clr() calls vm_unmap_alias() which ultimately takes a mutex, disallowing atomic context here.