5.5

CVE-2026-46268

PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.15 < 6.18.14
Linux ≫ Linux Kernel Version >= 6.19 < 6.19.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.11% 0.017
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a
Patch
https://git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c
Patch
https://git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5
Patch