Answer in brief
CVE-2024-36881 records a Medium severity (CVSS 5.5) vulnerability in mm/userfaultfd: reset ptes when close() for wr-protected ones. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.9:rc7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f369b07c861435bd812a9d14493f71b34132ed6f <1da0471de653b13c8f63dcd32a23574d683c8310 || >=f369b07c861435bd812a9d14493f71b34132ed6f <377f3a9a3d032a52325a5b110379a25dd1ab1931 || >=f369b07c861435bd812a9d14493f71b34132ed6f <8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d || >=f369b07c861435bd812a9d14493f71b34132ed6f <c88033efe9a391e72ba6b5df4b01d6e628f4e734 || 3e2747c3ddfa717697c3cc2aa6ab989e48d6587d || >=5.19.6 <5.20 | 1da0471de653b13c8f63dcd32a23574d683c8310, 377f3a9a3d032a52325a5b110379a25dd1ab1931, 8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d, c88033efe9a391e72ba6b5df4b01d6e628f4e734, 5.20 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
May 30, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.