CVE-2026-46268 Details
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.
A vulnerability in the Linux kernel's PCI/P2PDMA subsystem has been addressed. The issue arose in the 'p2pmem_alloc_mmap()' function, which incorrectly asserted that the initial page reference count should not be zero. This assertion led to a warning when 'CONFIG_DEBUG_VM' was enabled, indicating a reference count of zero. The vulnerability was caused by a previous commit that changed the initial reference count from one to zero, creating a mismatch. The warning condition has been fixed by correcting the assertion to properly reflect the expected reference count.
Users can apply the latest patches from the Linux kernel stable tree to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/9b69243983fb2f4d4d1f4ef0989bc1296547dc2c | kernel.org | Patch |
| https://git.kernel.org/stable/c/cb500023a75246f60b79af9f7321d6e75330c5b5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/eb9aa9f8010465d927864f5a35bdc5604b0ff51a | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.15, < 6.18.14 >= 6.19, < 6.19.4 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 9, 2026 | Initial Analysis | [email protected] |
| Jun 3, 2026 | New CVE Received | kernel.org |