CVE-2025-40315 (GCVE-0-2025-40315)
Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-23 16:02
VLAI
EPSS
VEX
Title
usb: gadget: f_fs: Fix epfile null pointer access after ep enable.
Summary
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_fs: Fix epfile null pointer access after ep enable.
A race condition occurs when ffs_func_eps_enable() runs concurrently
with ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset()
sets ffs->epfiles to NULL before resetting ffs->eps_count to 0, leading
to a NULL pointer dereference when accessing epfile->ep in
ffs_func_eps_enable() after successful usb_ep_enable().
The ffs->epfiles pointer is set to NULL in both ffs_data_clear() and
ffs_data_close() functions, and its modification is protected by the
spinlock ffs->eps_lock. And the whole ffs_func_eps_enable() function
is also protected by ffs->eps_lock.
Thus, add NULL pointer handling for ffs->epfiles in the
ffs_func_eps_enable() function to fix issues
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
c9fc422c9a43e3d58d246334a71f3390401781dc , < b00d2572c16e8e59e979960d3383c2ae9cebd195
(git)
Affected: 0042178a69eb77a979e36a50dcce9794a3140ef8 , < 1c0dbd240be3f87cac321b14e17979b7e9cb6a8f (git) Affected: 72a8aee863af099d4434314c4536d6c9a61dcf3c , < 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272 (git) Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < c53e90563bc148e4e0ad09fe130ba2246d426ea6 (git) Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < fc1141a530dfc91f0ee19b7f422a2d24829584bc (git) Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < d62b808d5c68a931ad0849a00a5e3be3dd7e0019 (git) Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < 30880e9df27332403dd638a82c27921134b3630b (git) Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4 (git) Affected: 32048f4be071f9a6966744243f1786f45bb22dc2 (git) Affected: cfe5f6fd335d882bcc829a1c8a7d462a455c626e (git) Affected: 3e078b18753669615301d946297bafd69294ad2c (git) Affected: 5.4.180 , < 5.4.302 (semver) Affected: 5.10.101 , < 5.10.247 (semver) Affected: 5.15.24 , < 5.15.197 (semver) Affected: 4.14.267 , < 4.15 (semver) Affected: 4.19.230 , < 4.20 (semver) Affected: 5.16.10 , < 5.17 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.17
Unaffected: 0 , < 5.17 (semver) Unaffected: 5.4.302 , ≤ 5.4.* (semver) Unaffected: 5.10.247 , ≤ 5.10.* (semver) Unaffected: 5.15.197 , ≤ 5.15.* (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.58 , ≤ 6.12.* (semver) Unaffected: 6.17.8 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
{
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},
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},
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}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix epfile null pointer access after ep enable.\n\nA race condition occurs when ffs_func_eps_enable() runs concurrently\nwith ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset()\nsets ffs-\u003eepfiles to NULL before resetting ffs-\u003eeps_count to 0, leading\nto a NULL pointer dereference when accessing epfile-\u003eep in\nffs_func_eps_enable() after successful usb_ep_enable().\n\nThe ffs-\u003eepfiles pointer is set to NULL in both ffs_data_clear() and\nffs_data_close() functions, and its modification is protected by the\nspinlock ffs-\u003eeps_lock. And the whole ffs_func_eps_enable() function\nis also protected by ffs-\u003eeps_lock.\n\nThus, add NULL pointer handling for ffs-\u003eepfiles in the\nffs_func_eps_enable() function to fix issues"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T16:02:03.665Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b00d2572c16e8e59e979960d3383c2ae9cebd195"
},
{
"url": "https://git.kernel.org/stable/c/1c0dbd240be3f87cac321b14e17979b7e9cb6a8f"
},
{
"url": "https://git.kernel.org/stable/c/9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272"
},
{
"url": "https://git.kernel.org/stable/c/c53e90563bc148e4e0ad09fe130ba2246d426ea6"
},
{
"url": "https://git.kernel.org/stable/c/fc1141a530dfc91f0ee19b7f422a2d24829584bc"
},
{
"url": "https://git.kernel.org/stable/c/d62b808d5c68a931ad0849a00a5e3be3dd7e0019"
},
{
"url": "https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b"
},
{
"url": "https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4"
}
],
"title": "usb: gadget: f_fs: Fix epfile null pointer access after ep enable.",
"x_generator": {
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}
}
},
"cveMetadata": {
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"cveId": "CVE-2025-40315",
"datePublished": "2025-12-08T00:46:41.896Z",
"dateReserved": "2025-04-16T07:20:57.186Z",
"dateUpdated": "2026-05-23T16:02:03.665Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-40315",
"date": "2026-10-01",
"epss": "0.00201",
"percentile": "0.09008"
},
"microsoft_vex": {
"current_release_date": "2025-12-09T01:02:15.000Z",
"cve": "CVE-2025-40315",
"id": "msrc_CVE-2025-40315",
"initial_release_date": "2025-12-02T00:00:00.000Z",
"product_status:known_not_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "usb: gadget: f_fs: Fix epfile null pointer access after ep enable.",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40315.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "c9fc422c9a43e3d58d246334a71f3390401781dc",
"versionType": "git"
},
{
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},
{
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"versionType": "git"
},
{
"lessThan": "c53e90563bc148e4e0ad09fe130ba2246d426ea6",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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},
{
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},
{
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},
{
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{
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},
{
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},
{
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{
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"version": "4.14.267",
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{
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"versionType": "semver"
}
]
},
{
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "5.17"
},
{
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"status": "unaffected",
"version": "0",
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{
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},
{
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"version": "5.10.247",
"versionType": "semver"
},
{
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"versionType": "semver"
},
{
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"versionType": "semver"
},
{
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},
{
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"status": "unaffected",
"version": "6.12.58",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix epfile null pointer access after ep enable.\n\nA race condition occurs when ffs_func_eps_enable() runs concurrently\nwith ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset()\nsets ffs-\u003eepfiles to NULL before resetting ffs-\u003eeps_count to 0, leading\nto a NULL pointer dereference when accessing epfile-\u003eep in\nffs_func_eps_enable() after successful usb_ep_enable().\n\nThe ffs-\u003eepfiles pointer is set to NULL in both ffs_data_clear() and\nffs_data_close() functions, and its modification is protected by the\nspinlock ffs-\u003eeps_lock. And the whole ffs_func_eps_enable() function\nis also protected by ffs-\u003eeps_lock.\n\nThus, add NULL pointer handling for ffs-\u003eepfiles in the\nffs_func_eps_enable() function to fix issues"
}
],
"id": "CVE-2025-40315",
"lastModified": "2026-06-17T09:21:38.720",
"metrics": {},
"published": "2025-12-08T01:16:04.013",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1c0dbd240be3f87cac321b14e17979b7e9cb6a8f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b00d2572c16e8e59e979960d3383c2ae9cebd195"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c53e90563bc148e4e0ad09fe130ba2246d426ea6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d62b808d5c68a931ad0849a00a5e3be3dd7e0019"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fc1141a530dfc91f0ee19b7f422a2d24829584bc"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-30T10:34:35+00:00",
"cve": "CVE-2025-40315",
"id": "CVE-2025-40315",
"initial_release_date": "2025-12-08T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: usb: gadget: f_fs: Fix epfile null pointer access after ep enable",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40315.json",
"version": "3"
}
}
}
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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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