CVE-2025-39738 remediation guide

Linux Linux, SIMATIC CN 4100, linux kernel

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not allow relocation of partially dropped subvolumes [BUG] There is an internal report that balance triggered transaction abort, with the following call trace: item 85 key (594509824 169 0) itemoff 12599 itemsize 33 extent refs 1 gen 197740 flags 2 ref#0: tree block backref root 7 item 86 key (594558976 169 0) itemoff 12566 itemsize 33 extent refs 1 gen 197522 flags 2 ref#0: tree block backref root 7 ... BTRFS error (device loop0): extent item not found for insert, bytenr 594526208 num_bytes 16384 parent 449921024...

Open CVE record

ProductLinux Linux, SIMATIC CN 4100, linux kernel

Affected versions>= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < f83d4c81bda3b7d1813268ab77408f7a0ce691ff, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 125e94a4b76b7b75d194f85bedd628097d2121f0, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 4e403bd8e127d40dc7c05f06ee969c1ba1537ec5, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 4289b494ac553e74e86fed1c66b2bf9530bc1082, >= 5.11, < V5.0, >= 5.11.1 < 5.15.190, >= 5.16 < 6.1.149, >= 6.2 < 6.6.103, >= 6.7 < 6.12.43, >= 6.13 < 6.15.11, >= 6.16 < 6.16.2, 5.11, 6.17, 11.0

Fixed versions5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2

Priority basisReview · CVSS 7.8 · EPSS 0.16%

Identify the affected asset

Confirm whether Linux Linux, SIMATIC CN 4100, linux kernel is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < fa086b1398cf7e5f7dee7241bd5f2855cb5df8dc, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < fcb1f77b8ed8795608ca7a1f6505e2b07236c1f3, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < f83d4c81bda3b7d1813268ab77408f7a0ce691ff, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 39a93e1c9dbf7e11632efeb20fcf0fc1dcf64d51, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 125e94a4b76b7b75d194f85bedd628097d2121f0, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 4e403bd8e127d40dc7c05f06ee969c1ba1537ec5, >= 638331fa56caeaa8b4d31cc1dfbe0ce989bcff67 < 4289b494ac553e74e86fed1c66b2bf9530bc1082, >= 5.11, < V5.0, >= 5.11.1 < 5.15.190, >= 5.16 < 6.1.149, >= 6.2 < 6.6.103, >= 6.7 < 6.12.43, >= 6.13 < 6.15.11, >= 6.16 < 6.16.2, 5.11, 6.17, 11.0. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11, 6.16.2. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.