Answer in brief
CVE-2026-74487 records a Unknown severity vulnerability in binfmt_misc: restore write access when removing an entry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=948b701a607f123df92ed29084413e5dd8cda2ed <fdc1d702bf3001586221fa07e598e876a0a854c5 || >=948b701a607f123df92ed29084413e5dd8cda2ed <3b522487a3a9162b1b519eefde7998d103e3e07b || >=948b701a607f123df92ed29084413e5dd8cda2ed <db1856ea9196cf6e015d12199a34c0b9313c7bfa | fdc1d702bf3001586221fa07e598e876a0a854c5, 3b522487a3a9162b1b519eefde7998d103e3e07b, db1856ea9196cf6e015d12199a34c0b9313c7bfa |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74487 records a Unknown severity vulnerability in binfmt_misc: restore write access when removing an entry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=948b701a607f123df92ed29084413e5dd8cda2ed <fdc1d702bf3001586221fa07e598e876a0a854c5 || >=948b701a607f123df92ed29084413e5dd8cda2ed <3b522487a3a9162b1b519eefde7998d103e3e07b || >=948b701a607f123df92ed29084413e5dd8cda2ed <db1856ea9196cf6e015d12199a34c0b9313c7bfa | fdc1d702bf3001586221fa07e598e876a0a854c5, 3b522487a3a9162b1b519eefde7998d103e3e07b, db1856ea9196cf6e015d12199a34c0b9313c7bfa |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.