CVE-2026-46268

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition<br /> <br /> Commit b7e282378773 has already changed the initial page refcount of<br /> p2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses<br /> "VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))" to assert the initial page<br /> refcount should not be zero and the following will be reported when<br /> CONFIG_DEBUG_VM is enabled:<br /> <br /> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000<br /> flags: 0x20000000002000(reserved|node=0|zone=4)<br /> raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000<br /> raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000<br /> page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))<br /> ------------[ cut here ]------------<br /> WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60<br /> <br /> Fix by using "page_ref_count(page)" as the assertion condition.