Linux Kernel up to 6.18.41/7.1.5/7.2-rc4 ovl copy_file_range permission

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.78+

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.41/7.1.5/7.2-rc4. It has been classified as critical. This vulnerability affects the function copy_file_range of the component ovl. This manipulation causes permission. This vulnerability is tracked as CVE-2026-68448. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.41/7.1.5/7.2-rc4. It has been declared as critical. Affected by this vulnerability is the function copy_file_range of the component ovl. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-68448 since 07/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/12/2026). MITRE ATT&CK project uses the attack technique T1222 for this issue.

Upgrading to version 6.18.42, 7.1.6 or 7.2-rc5 eliminates this vulnerability. Applying the patch 9ec22c8113d8cf72ed7197bb61037dcad09e50d8/1f4a107439d2e43db176e34919933e617cb7f2c5/a1e0eb8f55cfe09bb31a202a388babc411292656 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Permission
CWE: CWE-275 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.42/7.1.6/7.2-rc5
Patch: 9ec22c8113d8cf72ed7197bb61037dcad09e50d8/1f4a107439d2e43db176e34919933e617cb7f2c5/a1e0eb8f55cfe09bb31a202a388babc411292656

Timelineinfo

07/30/2026 CVE reserved
08/12/2026 +13 days Advisory disclosed
08/12/2026 +0 days VulDB entry created
08/12/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-68448 (🔒)
GCVE (CVE): GCVE-0-2026-68448
GCVE (VulDB): GCVE-100-388897

Entryinfo

Created: 08/12/2026 03:25
Changes: 08/12/2026 03:25 (59)
Complete: 🔍
Cache ID: 216::103

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