CVE-2024-40948

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b
https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0
https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43
https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629

Configurations

No configuration.

History

No history.

Information

Published : 2024-07-12 13:15

Updated : 2024-07-12 16:34

NVD link : CVE-2024-40948

Mitre link : CVE-2024-40948

CVE.ORG link : CVE-2024-40948

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2024-40948", "cveTags": [], "metrics": {}, "published": "2024-07-12T13:15:17.187", "references": [{"url": "https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Awaiting Analysis", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_table_check: fix crash on ZONE_DEVICE\n\nNot all pages may apply to pgtable check. One example is ZONE_DEVICE\npages: they map PFNs directly, and they don't allocate page_ext at all\neven if there's struct page around. One may reference\ndevm_memremap_pages().\n\nWhen both ZONE_DEVICE and page-table-check enabled, then try to map some\ndax memories, one can trigger kernel bug constantly now when the kernel\nwas trying to inject some pfn maps on the dax device:\n\n kernel BUG at mm/page_table_check.c:55!\n\nWhile it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page\nfault resolutions, skip all the checks if page_ext doesn't even exist in\npgtable checker, which applies to ZONE_DEVICE but maybe more."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/page_table_check: corrige el fallo en ZONE_DEVICE Es posible que no todas las p\u00e1ginas se apliquen a la verificaci\u00f3n de pgtable. Un ejemplo son las p\u00e1ginas ZONE_DEVICE: asignan PFN directamente y no asignan page_ext en absoluto, incluso si hay una p\u00e1gina de estructura alrededor. Se puede hacer referencia a devm_memremap_pages(). Cuando tanto ZONE_DEVICE como page-table-check est\u00e1n habilitados, intente asignar algunas memorias dax, uno puede desencadenar un error del kernel constantemente ahora cuando el kernel intenta inyectar algunos mapas pfn en el dispositivo dax: ERROR del kernel en mm/page_table_check.c: 55! Si bien es bastante legal usar set_pxx_at() para p\u00e1ginas ZONE_DEVICE para resoluci\u00f3n de fallas de p\u00e1gina, omita todas las comprobaciones si page_ext ni siquiera existe en pgtable checker, lo que se aplica a ZONE_DEVICE pero tal vez m\u00e1s."}], "lastModified": "2024-07-12T16:34:58.687", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}