# CVE-2026-46268: linux: In the Linux kernel, the following vulnerability has been resolved:  PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning cond...

CVE-2026-46268 is fixed in linux on 1 platform by DEBIAN-CVE-2026-46268 (version 6.18.14-1), released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-46268
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0011
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 3, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.18.14-1 | [DEBIAN-CVE-2026-46268](https://patchblox.com/security/data/fix/linux/debian-cve-2026-46268.md) | Jun 24, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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