CVE-2026-46268

Kernel warning via inverted P2PDMA refcount assertion

Published Jun 3, 2026 · Updated Jun 3, 2026

Incorrect warning logic in Linux Kernel 6.15 through 6.18.13 and 6.19 through 6.19.3 lets local users trigger a P2PDMA mmap warning. The p2pmem_alloc_mmap() function applies VM_WARN_ON_ONCE_PAGE to a negated page reference count even though P2PDMA pages now start with a zero count. The path requires CONFIG_DEBUG_VM and P2PDMA mmap access; the warning crashes the host only when panic_on_warn is enabled.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect warning logic in Linux Kernel 6.15 through 6.18.13 and 6.19 through 6.19.3 lets local users trigger a P2PDMA mmap warning. The p2pmem_alloc_mmap() function applies VM_WARN_ON_ONCE_PAGE to a negated page reference count even though P2PDMA pages now start with a zero count. The path requires CONFIG_DEBUG_VM and P2PDMA mmap access; the warning crashes the host only when panic_on_warn is enabled.

The record

CVE
CVE-2026-46268
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.15
  2. Affected versionversion=b7e2823787735ca009e63f35f164b46df0ef096c <9b69243983fb2f4d4d1f4ef0989bc1296547dc2c
  3. Affected versionversion=b7e2823787735ca009e63f35f164b46df0ef096c <cb500023a75246f60b79af9f7321d6e75330c5b5
  4. Affected versionversion=b7e2823787735ca009e63f35f164b46df0ef096c <eb9aa9f8010465d927864f5a35bdc5604b0ff51a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=b7e2823787735ca009e63f35f164b46df0ef096c <9b69243983fb2f4d4d1f4ef0989bc1296547dc2c; version=b7e2823787735ca009e63f35f164b46df0ef096c <cb500023a75246f60b79af9f7321d6e75330c5b5; version=b7e2823787735ca009e63f35f164b46df0ef096c <eb9aa9f8010465d927864f5a35bdc5604b0ff51a

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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