Medium 5.5Published Jun 3, 2026

CVE-2026-46268PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition

Updated under an hour ago (Oct 27, 2026, 11:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b7e2823787735ca009e63f35f164b46df0ef096c before eb9aa9f8010465d927864f5a35bdc5604b0ff51a; from b7e2823787735ca009e63f35f164b46df0ef096c before 9b69243983fb2f4d4d1f4ef0989bc1296547dc2c; from b7e2823787735ca009e63f35f164b46df0ef096c before cb500023a75246f60b79af9f7321d6e75330c5b5	CNA record
linux linux_kernel linux:linux_kernel	from 6.15 before 6.18.14; from 6.19 before 6.19.4	NVD

References

References

https://git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a	patch
https://git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c	patch
https://git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.