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Review reviewHigh

CVE-2026-46054

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8

In 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...

CVSS
7.1
EPSS
0.12%
2.02% percentile
CISA KEV
Not listed
Published
2026.05.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.1

Vulnerability overview

In 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...

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8
Affected versions
>= 2f502839e85ab265f03f25f30d6463154aee5473 < bc6c380c1159de52a252ed11f19a42c47f60a735, >= 2f502839e85ab265f03f25f30d6463154aee5473 < 8bacd09f12c27710228562e4d13163e58c5f4a45, >= 2f502839e85ab265f03f25f30d6463154aee5473 < d844702198395d3f80222777030f69db6be6b709, >= 2f502839e85ab265f03f25f30d6463154aee5473 < cd0e707a927a70cdfd8bc5a512a9719a87f5ed51, >= 2f502839e85ab265f03f25f30d6463154aee5473 < 82544d36b1729153c8aeb179e84750f0c085d3b1, >= 4.19, >= 4.19 < 7.0.4
Fixed versions
7.0.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
CWE-280