CVE-2026-74487 (GCVE-0-2026-74487)
Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
VLAI
EPSS
VEX
Title
binfmt_misc: restore write access when removing an entry
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.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
948b701a607f123df92ed29084413e5dd8cda2ed , < 7873f987213695e3564c8c259e6db283e4739472
(git)
Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < 13efc628fdf641d901bdba07caa1c558e1bed046 (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < f1cf67f6be0babc73afa4ee0e27bdedffeeeb095 (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8 (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < fdc1d702bf3001586221fa07e598e876a0a854c5 (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < 3b522487a3a9162b1b519eefde7998d103e3e07b (git) Affected: 948b701a607f123df92ed29084413e5dd8cda2ed , < db1856ea9196cf6e015d12199a34c0b9313c7bfa (git) |
guessed | |
| Linux | Linux |
Affected:
4.8
Unaffected: 0 , < 4.8 (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.153 , ≤ 6.6.* (semver) Unaffected: 6.12.105 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"version": "5.10.266",
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},
{
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"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.184",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.105",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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},
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "4.8",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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": [
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"url": "https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472"
},
{
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{
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},
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},
{
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},
{
"url": "https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"
},
{
"url": "https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"
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"x_generator": {
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"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",
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"date": "2026-10-02",
"epss": "0.00177",
"percentile": "0.06545"
},
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"id": "msrc_CVE-2026-74487",
"initial_release_date": "2026-09-23T01:53:24.000Z",
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"title": "binfmt_misc: restore write access when removing an entry",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74487.json",
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},
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{
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},
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}
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}
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],
"cveTags": [],
"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."
}
],
"id": "CVE-2026-74487",
"lastModified": "2026-08-23T13:16:44.750",
"metrics": {},
"published": "2026-08-15T13:17:53.593",
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},
{
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{
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-21T08:45:41+00:00",
"cve": "CVE-2026-74487",
"id": "CVE-2026-74487",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "246",
"product_status:known_not_affected": "28",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: binfmt_misc: restore write access when removing an entry",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74487.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-15T01:20:12Z",
"cve": "CVE-2026-74487",
"id": "CVE-2026-74487",
"initial_release_date": "2026-08-15T23:51:54Z",
"product_status:known_affected": "356",
"product_status:known_not_affected": "6",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-74487",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74487.json",
"version": "7"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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