PT-2026-46031 · Linux · Linux
Published
2026-06-03
·
Updated
2026-06-03
·
CVE-2026-46268
None
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In the Linux kernel, the following vulnerability has been resolved:
PCI/P2PDMA: Fix p2pmem alloc mmap() warning condition
Commit b7e282378773 has already changed the initial page refcount of
p2pdma page from one to zero, however, in p2pmem alloc mmap() it uses
"VM WARN ON ONCE PAGE(!page ref count(page))" to assert the initial page
refcount should not be zero and the following will be reported when
CONFIG DEBUG VM is enabled:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000
flags: 0x20000000002000(reserved|node=0|zone=4)
raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: VM WARN ON ONCE PAGE(!page ref count(page))
------------[ cut here ]------------
WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem alloc mmap+0x83a/0xa60
Fix by using "page ref count(page)" as the assertion condition.
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Related Identifiers
Affected Products
Linux