PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition

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Summary

CVECVE-2026-46268
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 18:16:28 UTC
Updated2026-06-05 20:51:20 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042400000 (date 2026-06-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b7e2823787735ca009e63f35f164b46df0ef096c eb9aa9f8010465d927864f5a35bdc5604b0ff51a git Not specified
CNA Linux Linux affected b7e2823787735ca009e63f35f164b46df0ef096c 9b69243983fb2f4d4d1f4ef0989bc1296547dc2c git Not specified
CNA Linux Linux affected b7e2823787735ca009e63f35f164b46df0ef096c cb500023a75246f60b79af9f7321d6e75330c5b5 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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