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Fencer Vulns
no cvss —

CVE-2026-68448 json

ovl: check access to copy_file_range source with src mounter creds

published 2026-08-12 2 mo ago modified 2026-10-30 9 d ago also EUVD-2026-57054

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

ovl: check access to copy_file_range source with src mounter creds

Commit 5dae222a5ff0c ("vfs: allow copy_file_range to copy across devices") allowed filesystems that implement the copy_file_range() f_op to decide if they want to access cross-sb copy from/to the same fs type.

The same commit added checks to verify same sb copy for filesystems that implement ->copy_file_range() and do not support cross-sb copy at the time, namely, to ceph, fuse and nfs.

The two remaining fs which implement ->copy_file_range(), cifs and overlayfs started to support cross-sb copy from this time.

While overlayfs does support cross-sb copy when the two underlying files are on the same base fs, the copy operation on the two real files from two different overalyfs filesystems is performed with the mounter creds of the destination overlayfs and the read permission access hook for the source file was called with the wrong creds.

This could cause either deny of access to copy which would otherwise be allowed (e.g. with splice) or allow read access to file which would otherwise be denied.

Fix the latter case by explicitly verifying read access to source file with the source overlayfs mounter creds.

The former case remains a quirk of cross-sb overlayfs copy, but userspace could fall back to regular copy so no harm done.

Patch / fix

  • Linux Linux 6.1.191, 6.6.160, 6.12.114, 6.18.42, 7.1.6, 7.2
  • linux Debian 13 6.12.115-2
  • linux Debian 14 7.1.6-1

debian advisories DEBIAN-CVE-2026-68448

  • linux Ubuntu 26.04 LTS 7.0.0-38.38
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gcp Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gke Ubuntu 26.04 LTS 7.0.0-1008.9
  • linux-ibm Ubuntu 26.04 LTS 7.0.0-1015.15
  • linux-azure Ubuntu 26.04 LTS 7.0.0-1017.17
  • linux-riscv Ubuntu 26.04 LTS 7.0.0-38.38.1
  • linux-oracle Ubuntu 26.04 LTS 7.0.0-1013.13

ubuntu advisories UBUNTU-CVE-2026-68448

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1.150700.17.47.1

suse advisories SUSE-SU-2026:4706-1SUSE-SU-2026:4640-1SUSE-SU-2026:24316-1SUSE-SU-2026:24315-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel AlmaLinux 9 5.14.0-687.60.1.el9_8
  • rv AlmaLinux 9 5.14.0-687.60.1.el9_8
  • perf AlmaLinux 9 5.14.0-687.60.1.el9_8
  • rtla AlmaLinux 9 5.14.0-687.60.1.el9_8
  • libperf AlmaLinux 9 5.14.0-687.60.1.el9_8
  • kernel-rt AlmaLinux 9 5.14.0-687.60.1.el9_8
  • kernel-64k AlmaLinux 9 5.14.0-687.60.1.el9_8
  • kernel-core AlmaLinux 9 5.14.0-687.60.1.el9_8

almalinux advisories ALSA-2026:87805ALSA-2026:88477

  • kernel Rocky Linux 10 6.12.0-211.68.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.60.1.el9_8

rocky linux advisories RLSA-2026:88477RLSA-2026:87805

  • kernel Azure Linux 3.0 6.6.161.1-1

azure linux advisories AZL-95513

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-68448 updated cvss 7.1

kernel: ovl: check access to copy_file_range source with src mounter creds

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux for NVIDIA 26 kernel
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.68.1.el10_2
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.60.1.el9_8, perf 5.14.0-687.60.1.el9_8, rtla 5.14.0-687.60.1.el9_8, python3-perf 5.14.0-687.60.1.el9_8, kernel-devel-matched 5.14.0-687.60.1.el9_8, kernel-64k-devel-matched 5.14.0-687.60.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:87805
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.68.1.el10_2, perf 6.12.0-211.68.1.el10_2, rtla 6.12.0-211.68.1.el10_2, python3-perf 6.12.0-211.68.1.el10_2, kernel-devel-matched 6.12.0-211.68.1.el10_2, kernel-64k-devel-matched 6.12.0-211.68.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.60.1.el9_8, kernel-64k 5.14.0-687.60.1.el9_8, kernel-core 5.14.0-687.60.1.el9_8, kernel-tools 5.14.0-687.60.1.el9_8, kernel-modules 5.14.0-687.60.1.el9_8, kernel-64k-core 5.14.0-687.60.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:87805
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.68.1.el10_2, kernel-64k 6.12.0-211.68.1.el10_2, kernel-core 6.12.0-211.68.1.el10_2, kernel-tools 6.12.0-211.68.1.el10_2, kernel-modules 6.12.0-211.68.1.el10_2, kernel-64k-core 6.12.0-211.68.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.60.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.60.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.60.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.60.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.60.1.el9_8
    fixed: vendor fix RHSA-2026:87805
show 6 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.68.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.68.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.68.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.68.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.68.1.el10_2 Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.68.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.68.1.el10_2
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.60.1.el9_8, kernel-rt-64k 5.14.0-687.60.1.el9_8, kernel-rt-core 5.14.0-687.60.1.el9_8, kernel-rt-modules 5.14.0-687.60.1.el9_8, kernel-rt-64k-core 5.14.0-687.60.1.el9_8, kernel-rt-debug-core 5.14.0-687.60.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:87805
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.68.1.el10_2, kernel-rt-64k 6.12.0-211.68.1.el10_2, kernel-rt-core 6.12.0-211.68.1.el10_2, kernel-rt-modules 6.12.0-211.68.1.el10_2, kernel-rt-64k-core 6.12.0-211.68.1.el10_2, kernel-rt-debug-core 6.12.0-211.68.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.60.1.el9_8, kernel-rt-core 5.14.0-687.60.1.el9_8, kernel-rt-modules 5.14.0-687.60.1.el9_8, kernel-rt-debug-core 5.14.0-687.60.1.el9_8, kernel-rt-modules-core 5.14.0-687.60.1.el9_8, kernel-rt-debug-modules 5.14.0-687.60.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:87805
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.68.1.el10_2, kernel-rt-core 6.12.0-211.68.1.el10_2, kernel-rt-modules 6.12.0-211.68.1.el10_2, kernel-rt-debug-core 6.12.0-211.68.1.el10_2, kernel-rt-modules-core 6.12.0-211.68.1.el10_2, kernel-rt-debug-modules 6.12.0-211.68.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:88477
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.