CVE-2026-74487

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

binfmt_misc: restore write access when removing an entry

Registering an entry with the MISC_FMT_OPEN_FILE flag opens the

interpreter via open_exec() which denies write access to it for as

long as the entry exists. Removing the entry closes the interpreter

file via filp_close() but never restores write access, leaving the

inode's i_writecount permanently negative. Opening the interpreter

for writing keeps failing with ETXTBSY long after the entry is gone

until the inode is evicted from the inode cache.

Commit 90f601b497d7 ("binfmt_misc: restore write access before

closing files opened by open_exec()") fixed the same imbalance in the

error path of bm_register_write() but the actual removal path has

been leaking the write denial since the introduction of the flag.

Restore write access in put_binfmt_handler() before closing the

interpreter file.