Description
In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: fix crash on ZONE_DEVICE Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages(). When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device: kernel BUG at mm/page_table_check.c:55! While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
df4e817b710809425d899340dbfa8504a3ca4ba5 to < 51897f99351fff7b57f4f141940fa93b4e90fd2baffecteddf4e817b710809425d899340dbfa8504a3ca4ba5 to < 84d3549d54f5ff9fa3281257be3019386f51d1a0affecteddf4e817b710809425d899340dbfa8504a3ca4ba5 to < dec2382247860d2134c8d41e103e26460c099629affecteddf4e817b710809425d899340dbfa8504a3ca4ba5 to < 8bb592c2eca8fd2bc06db7d80b38da18da4a2f43affected
Linux Linux
Default version status: affected
5.17affected0 to < 5.17unaffected6.1.96 to ≤ 6.1.*unaffected6.6.36 to ≤ 6.6.*unaffected6.9.7 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b ↗
- https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0 ↗
- https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629 ↗
- https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗