selinux: fix overlayfs mmap() and mprotect() access checks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46054
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:25 UTC
Updated2026-07-21 12:18:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: selinux: fix overlayfs mmap() and mprotect() access checks The existing SELinux security model for overlayfs is to allow access if the current task is able to access the top level file (the "user" file) and the mounter's credentials are sufficient to access the lower level file (the "backing" file). Unfortunately, the current code does not properly enforce these access controls for both mmap() and mprotect() operations on overlayfs filesystems. This patch makes use of the newly created security_mmap_backing_file() LSM hook to provide the missing backing file enforcement for mmap() operations, and leverages the backing file API and new LSM blob to provide the necessary information to properly enforce the mprotect() access controls.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from ADP

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001180000 probability, percentile 0.020450000 (date 2026-07-21)

Problem Types: NVD-CWE-noinfo | CWE-280 | CWE-280 Improper Handling of Insufficient Permissions or Privileges

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2f502839e85ab265f03f25f30d6463154aee5473 bc6c380c1159de52a252ed11f19a42c47f60a735 git Not specified
CNA Linux Linux affected 2f502839e85ab265f03f25f30d6463154aee5473 8bacd09f12c27710228562e4d13163e58c5f4a45 git Not specified
CNA Linux Linux affected 2f502839e85ab265f03f25f30d6463154aee5473 d844702198395d3f80222777030f69db6be6b709 git Not specified
CNA Linux Linux affected 2f502839e85ab265f03f25f30d6463154aee5473 cd0e707a927a70cdfd8bc5a512a9719a87f5ed51 git Not specified
CNA Linux Linux affected 2f502839e85ab265f03f25f30d6463154aee5473 82544d36b1729153c8aeb179e84750f0c085d3b1 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:6.12.0-211.22.1.el10_2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.137.1.rt7.478.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.137.1.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-687.19.1.el9_8 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46054.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
git.kernel.org/stable/c/d844702198395d3f80222777030f69db6be6b709 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
access.redhat.com/errata/RHSA-2026:25191 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
git.kernel.org/stable/c/cd0e707a927a70cdfd8bc5a512a9719a87f5ed51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
access.redhat.com/errata/RHSA-2026:27811 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/security/cve/CVE-2026-46054 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
git.kernel.org/stable/c/bc6c380c1159de52a252ed11f19a42c47f60a735 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8bacd09f12c27710228562e4d13163e58c5f4a45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
access.redhat.com/errata/RHSA-2026:27812 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:30848 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
git.kernel.org/stable/c/82544d36b1729153c8aeb179e84750f0c085d3b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-05-27T00:00:00.000ZReported to Red Hat.
ADP2026-05-27T00:00:00.000ZMade public.

Solutions

ADP: RHSA-2026:25191: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)

ADP: RHSA-2026:30848: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)

ADP: RHSA-2026:27811: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)

ADP: RHSA-2026:27812: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)

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