CVE-2024-36881Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: mm/userfaultfd: reset ptes when close() for wr-protected ones Userfaultfd unregister includes a step to remove wr-protect bits from all the relevant pgtable entries, b…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
mm/userfaultfd: reset ptes when close() for wr-protected ones
Userfaultfd unregister includes a step to remove wr-protect bits from all the relevant pgtable entries, but that only covered an explicit UFFDIO_UNREGISTER ioctl, not a close() on the userfaultfd itself. Cover that too. This fixes a WARN trace.
The only user visible side effect is the user can observe leftover wr-protect bits even if the user close()ed on an userfaultfd when releasing the last reference of it. However hopefully that should be harmless, and nothing bad should happen even if so.
This change is now more important after the recent page-table-check patch we merged in mm-unstable (446dd9ad37d0 ("mm/page_table_check: support userfault wr-protect entries")), as we'll do sanity check on uffd-wp bits without vma context. So it's better if we can 100% guarantee no uffd-wp bit leftovers, to make sure each report will be valid.
Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 1da0471de653b13c8f63dcd32a23574d683c8310Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 377f3a9a3d032a52325a5b110379a25dd1ab1931Linux >= f369b07c861435bd812a9d14493f71b34132ed6f < 8d8b68a5b0c9fb23d37df06bb273ead38fd5a29dLinux >= f369b07c861435bd812a9d14493f71b34132ed6f < c88033efe9a391e72ba6b5df4b01d6e628f4e734Linux 3e2747c3ddfa717697c3cc2aa6ab989e48d6587dLinux >= 5.19.6 < 5.20Linux 6.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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