CVE-2026-64596

Local kernel warning via executable dma-buf mapping

Published Aug 6, 2026 · Updated Aug 6, 2026

Improper pseudo-filesystem initialization in Linux allows local users to trigger a kernel warning via an executable dma-buf mapping. The libfs init_pseudo() helper leaves internal superblocks without SB_I_NOEXEC, so path_noexec() warns when mmap processes an exported dma-buf. The issue is reachable on CONFIG_DEBUG_VFS=y kernels and produces a warning, with no reported crash, hang, or data compromise.

CVSS severity3.3
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper pseudo-filesystem initialization in Linux allows local users to trigger a kernel warning via an executable dma-buf mapping. The libfs init_pseudo() helper leaves internal superblocks without SB_I_NOEXEC, so path_noexec() warns when mmap processes an exported dma-buf. The issue is reachable on CONFIG_DEBUG_VFS=y kernels and produces a warning, with no reported crash, hang, or data compromise.

The record

CVE
CVE-2026-64596
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=1e7ab6f67824343ee3e96f100f0937c393749a8a <6de2aeffabaafaeda819e60ec8d04f199711e11a
  2. Affected versionversion=1e7ab6f67824343ee3e96f100f0937c393749a8a <8e931557b317f0fb414839fa51fae1d5feb0ad97
  3. Affected versionversion=1e7ab6f67824343ee3e96f100f0937c393749a8a <b9d45d328fcda4f0d3d281b7d6f12d3f181d9381
  4. Affected versionversion=6.15.6 <6.16
  5. Affected versionversion=6.16
  6. Affected versionversion=9b8076a9404568d6cb6673b9a079558b15051966

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1e7ab6f67824343ee3e96f100f0937c393749a8a <6de2aeffabaafaeda819e60ec8d04f199711e11a; version=1e7ab6f67824343ee3e96f100f0937c393749a8a <8e931557b317f0fb414839fa51fae1d5feb0ad97; version=1e7ab6f67824343ee3e96f100f0937c393749a8a <b9d45d328fcda4f0d3d281b7d6f12d3f181d9381; version=6.15.6 <6.16; version=6.16; version=9b8076a9404568d6cb6673b9a079558b15051966

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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