CVE-2024-40948 Affecting kernel-64kb-devel package, versions <6.4.0-150600.23.17.1
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Test your applications- Snyk ID SNYK-SLES156-KERNEL64KBDEVEL-7649642
- published 8 Aug 2024
- disclosed 7 Aug 2024
Introduced: 7 Aug 2024
CVE-2024-40948 Open this link in a new tabHow to fix?
Upgrade SLES:15.6 kernel-64kb-devel to version 6.4.0-150600.23.17.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-64kb-devel package and not the kernel-64kb-devel package as distributed by SLES.
See How to fix? for SLES:15.6 relevant fixed versions and status.
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.
References
- https://www.suse.com/security/cve/CVE-2024-40948.html
- https://bugzilla.suse.com/1227801
- 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