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CVE-2026-74487

UnknownEPSS 0.17%

Last modified

CVE-2026-74487 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.17%

6.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 948b701a607f123df92ed29084413e5dd8cda2ed, < 7873f987213695e3564c8c259e6db283e4739472; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < 13efc628fdf641d901bdba07caa1c558e1bed046; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < f1cf67f6be0babc73afa4ee0e27bdedffeeeb095; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < fdc1d702bf3001586221fa07e598e876a0a854c5; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < 3b522487a3a9162b1b519eefde7998d103e3e07b; >= 948b701a607f123df92ed29084413e5dd8cda2ed, < db1856ea9196cf6e015d12199a34c0b9313c7bfa
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-74487?
Severity scoring for CVE-2026-74487 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74487?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST