NULL Pointer Dereference Affecting kernel-modules-extra-matched package, versions *
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELMODULESEXTRAMATCHED-18409240
- published30 Jul 2026
- disclosed25 Jul 2026
Introduced: 25 Jul 2026
NewCVE-2026-64295 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-modules-extra-matched.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules-extra-matched package and not the kernel-modules-extra-matched package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access
The page_ext iteration API does not validate if the PFN still belongs to a valid section while advancing the iterator. When dynamically adding memory in the hotplug path, it can lead to a NULL pointer dereference during page_ext_lookup at the boundary of the last valid section when iterator count equals __pgcount.
The for_each_page_ext() macro calls page_ext_iter_next() as its loop increment. for_each_page_ext() does a "__page_ext = page_ext_iter_next(&__iter)" at the end. This causes page_ext_iter_next() to increment iter->index past __pgcount and call page_ext_lookup(start_pfn
- __pgcount). During memory hotplug (online), the PFN at start_pfn + __pgcount may belong to a section that has not yet been initialized, causing page_ext_lookup() to trigger a NULL pointer dereference.
[ 14.555124][ T846] Call trace: [ 14.555125][ T846] lookup_page_ext+0x6c/0x108 (P) [ 14.555127][ T846] page_ext_lookup+0x30/0x3c [ 14.555129][ T846] __reset_page_owner+0x11c/0x260 [ 14.571201][ T846] __free_pages_ok+0x5e8/0x8e0 [ 14.571204][ T846] __free_pages_core+0x78/0xf0 [ 14.571206][ T846] generic_online_page+0x14/0x24 [ 14.597782][ T846] online_pages+0x178/0x30c [ 14.597784][ T846] memory_block_change_state+0x284/0x32c [ 14.597787][ T846] memory_subsys_online+0x4c/0x64 [ 14.597789][ T846] device_online+0x88/0xb0 [ 14.597791][ T846] online_memory_block+0x30/0x40 [ 14.597793][ T846] walk_memory_blocks+0xac/0xe8 [ 14.597794][ T846] add_memory_resource+0x280/0x298 [ 14.656161][ T846] add_memory+0x60/0x98
Move the iteration boundary enforcement inside the iterator functions, so callers cannot inadvertently access beyond the requested range.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2507174
- https://access.redhat.com/security/cve/CVE-2026-64295
- https://git.kernel.org/stable/c/377b1cd6bbcf327338cd951cc2fd74bc75540235
- https://git.kernel.org/stable/c/8dcaa0f87a88d720d13106f3a306c6b61d189d86
- https://git.kernel.org/stable/c/ffd017237cfe99e6e5602ab14179b0e6878a0840