CVE-2026-74487 (GCVE-0-2026-74487)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-23 12:47
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed Version: 948b701a607f123df92ed29084413e5dd8cda2ed |
||
{
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{
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: restore write access when removing an entry\n\nRegistering an entry with the MISC_FMT_OPEN_FILE flag opens the\ninterpreter via open_exec() which denies write access to it for as\nlong as the entry exists. Removing the entry closes the interpreter\nfile via filp_close() but never restores write access, leaving the\ninode\u0027s i_writecount permanently negative. Opening the interpreter\nfor writing keeps failing with ETXTBSY long after the entry is gone\nuntil the inode is evicted from the inode cache.\n\nCommit 90f601b497d7 (\"binfmt_misc: restore write access before\nclosing files opened by open_exec()\") fixed the same imbalance in the\nerror path of bm_register_write() but the actual removal path has\nbeen leaking the write denial since the introduction of the flag.\n\nRestore write access in put_binfmt_handler() before closing the\ninterpreter file."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:47:26.657Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472"
},
{
"url": "https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046"
},
{
"url": "https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095"
},
{
"url": "https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c"
},
{
"url": "https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8"
},
{
"url": "https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5"
},
{
"url": "https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"
},
{
"url": "https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"
}
],
"title": "binfmt_misc: restore write access when removing an entry",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74487",
"datePublished": "2026-08-15T12:27:18.236Z",
"dateReserved": "2026-08-15T05:44:03.905Z",
"dateUpdated": "2026-08-23T12:47:26.657Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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