binfmt_misc: restore write access when removing an entry
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.266, 5.15.217, 6.1.184, 6.6.153, 6.12.105, 6.18.44, 7.1.8, 7.2
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74487
- 2026-10-03 Alias added: GHSA-fq4p-qqh8-rhh7
- 2026-11-06 CISA SSVC decision points changed
References
Other 8
- https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472
- https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046
- https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095
- https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c
- https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8
- https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5
- https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b
- https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa
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Sources
- CVE-2026-74487 · CVE Program
- CVE-2026-74487 · NVD
- FIRST EPSS
- GHSA-fq4p-qqh8-rhh7 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74487 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences