CVE-2025-68239

/// Technical description

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

binfmt_misc: restore write access before closing files opened by open_exec()

bm_register_write() opens an executable file using open_exec(), which

internally calls do_open_execat() and denies write access on the file to

avoid modification while it is being executed.

However, when an error occurs, bm_register_write() closes the file using

filp_close() directly. This does not restore the write permission, which

may cause subsequent write operations on the same file to fail.

Fix this by calling exe_file_allow_write_access() before filp_close() to

restore the write permission properly.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References