Riskcovery

CVE-2026-46268

PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition

State
Published
Severity
Not scored
Published
Jun 3, 2026
Updated
Jun 3, 2026
Reserved
May 13, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • b7e2823787735ca009e63f35f164b46df0ef096c to before eb9aa9f8010465d927864f5a35bdc5604b0ff51aAffected
  • b7e2823787735ca009e63f35f164b46df0ef096c to before 9b69243983fb2f4d4d1f4ef0989bc1296547dc2cAffected
  • b7e2823787735ca009e63f35f164b46df0ef096c to before cb500023a75246f60b79af9f7321d6e75330c5b5Affected
LinuxLinux
  • 6.15Affected
  • before 6.15Not affected
  • 6.18.14 through 6.18.*Not affected
  • 6.19.4 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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