binfmt_misc: restore write access when removing an entry

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74487
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:53 UTC
Updated2026-08-15 13:17:53 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 948b701a607f123df92ed29084413e5dd8cda2ed fdc1d702bf3001586221fa07e598e876a0a854c5 git Not specified
CNA Linux Linux affected 948b701a607f123df92ed29084413e5dd8cda2ed 3b522487a3a9162b1b519eefde7998d103e3e07b git Not specified
CNA Linux Linux affected 948b701a607f123df92ed29084413e5dd8cda2ed db1856ea9196cf6e015d12199a34c0b9313c7bfa git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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