CVE-2026-43327 (GCVE-0-2026-43327)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-05-23 16:06
VLAI
EPSS
VEX
Title
USB: dummy-hcd: Fix locking/synchronization error
Summary
In the Linux kernel, the following vulnerability has been resolved:
USB: dummy-hcd: Fix locking/synchronization error
Syzbot testing was able to provoke an addressing exception and crash
in the usb_gadget_udc_reset() routine in
drivers/usb/gadgets/udc/core.c, resulting from the fact that the
routine was called with a second ("driver") argument of NULL. The bad
caller was set_link_state() in dummy_hcd.c, and the problem arose
because of a race between a USB reset and driver unbind.
These sorts of races were not supposed to be possible; commit
7dbd8f4cabd9 ("USB: dummy-hcd: Fix erroneous synchronization change"),
along with a few followup commits, was written specifically to prevent
them. As it turns out, there are (at least) two errors remaining in
the code. Another patch will address the second error; this one is
concerned with the first.
The error responsible for the syzbot crash occurred because the
stop_activity() routine will sometimes drop and then re-acquire the
dum->lock spinlock. A call to stop_activity() occurs in
set_link_state() when handling an emulated USB reset, after the test
of dum->ints_enabled and before the increment of dum->callback_usage.
This allowed another thread (doing a driver unbind) to sneak in and
grab the spinlock, and then clear dum->ints_enabled and dum->driver.
Normally this other thread would have to wait for dum->callback_usage
to go down to 0 before it would clear dum->driver, but in this case it
didn't have to wait since dum->callback_usage had not yet been
incremented.
The fix is to increment dum->callback_usage _before_ calling
stop_activity() instead of after. Then the thread doing the unbind
will not clear dum->driver until after the call to
usb_gadget_udc_reset() safely returns and dum->callback_usage has been
decremented again.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 6350c7dd33ab481ef41c931a238361490c32d15c
(git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < cc97fb5969177cccce2e23b31298df220fc7570d (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 218886b2ef2dea7627d3700ab0abaf4bf9d1161f (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 791966f85b439b261bf19865cf1c07c065ffb4b4 (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 805b1833d6ed6da5086e610578a28e71bb54fbbb (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < efbd9441f1e769a7aae1813d497cec09cbdff031 (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 69ab97a693251d6a6093e630060a3c744fd58524 (git) Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 616a63ff495df12863692ab3f9f7b84e3fa7a66d (git) Affected: 7b416b9dac6ede26d4ca0c1a88b448b543623ff3 (git) Affected: 8590bc1da625dd4a589eac0fc3aa3cf4f400424d (git) Affected: a867d5b932ac4911d3f8a1e63505061b0c81f889 (git) Affected: e84b4a008365b7edbd842a063ae28d040a98db25 (git) Affected: e39b17143a5b5aac81f066d455e5d3a9877eb3ae (git) Affected: 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715 (git) Affected: 3.2.97 , < 3.3 (semver) Affected: 3.16.52 , < 3.17 (semver) Affected: 4.1.46 , < 4.2 (semver) Affected: 4.4.92 , < 4.5 (semver) Affected: 4.9.55 , < 4.10 (semver) Affected: 4.13.6 , < 4.14 (semver) |
guessed | |
| Linux | Linux |
Affected:
4.14
Unaffected: 0 , < 4.14 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: dummy-hcd: Fix locking/synchronization error\n\nSyzbot testing was able to provoke an addressing exception and crash\nin the usb_gadget_udc_reset() routine in\ndrivers/usb/gadgets/udc/core.c, resulting from the fact that the\nroutine was called with a second (\"driver\") argument of NULL. The bad\ncaller was set_link_state() in dummy_hcd.c, and the problem arose\nbecause of a race between a USB reset and driver unbind.\n\nThese sorts of races were not supposed to be possible; commit\n7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous synchronization change\"),\nalong with a few followup commits, was written specifically to prevent\nthem. As it turns out, there are (at least) two errors remaining in\nthe code. Another patch will address the second error; this one is\nconcerned with the first.\n\nThe error responsible for the syzbot crash occurred because the\nstop_activity() routine will sometimes drop and then re-acquire the\ndum-\u003elock spinlock. A call to stop_activity() occurs in\nset_link_state() when handling an emulated USB reset, after the test\nof dum-\u003eints_enabled and before the increment of dum-\u003ecallback_usage.\nThis allowed another thread (doing a driver unbind) to sneak in and\ngrab the spinlock, and then clear dum-\u003eints_enabled and dum-\u003edriver.\nNormally this other thread would have to wait for dum-\u003ecallback_usage\nto go down to 0 before it would clear dum-\u003edriver, but in this case it\ndidn\u0027t have to wait since dum-\u003ecallback_usage had not yet been\nincremented.\n\nThe fix is to increment dum-\u003ecallback_usage _before_ calling\nstop_activity() instead of after. Then the thread doing the unbind\nwill not clear dum-\u003edriver until after the call to\nusb_gadget_udc_reset() safely returns and dum-\u003ecallback_usage has been\ndecremented again."
}
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{
"url": "https://git.kernel.org/stable/c/616a63ff495df12863692ab3f9f7b84e3fa7a66d"
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"title": "USB: dummy-hcd: Fix locking/synchronization error",
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"cveId": "CVE-2026-43327",
"datePublished": "2026-05-08T13:31:12.896Z",
"dateReserved": "2026-05-01T14:12:56.002Z",
"dateUpdated": "2026-05-23T16:06:42.428Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-43327",
"date": "2026-09-14",
"epss": "0.00095",
"percentile": "0.00707"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43327\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T14:16:42.243\",\"lastModified\":\"2026-06-17T10:49:23.337\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nUSB: dummy-hcd: Fix locking/synchronization error\\n\\nSyzbot testing was able to provoke an addressing exception and crash\\nin the usb_gadget_udc_reset() routine in\\ndrivers/usb/gadgets/udc/core.c, resulting from the fact that the\\nroutine was called with a second (\\\"driver\\\") argument of NULL. The bad\\ncaller was set_link_state() in dummy_hcd.c, and the problem arose\\nbecause of a race between a USB reset and driver unbind.\\n\\nThese sorts of races were not supposed to be possible; commit\\n7dbd8f4cabd9 (\\\"USB: dummy-hcd: Fix erroneous synchronization change\\\"),\\nalong with a few followup commits, was written specifically to prevent\\nthem. As it turns out, there are (at least) two errors remaining in\\nthe code. Another patch will address the second error; this one is\\nconcerned with the first.\\n\\nThe error responsible for the syzbot crash occurred because the\\nstop_activity() routine will sometimes drop and then re-acquire the\\ndum-\u003elock spinlock. A call to stop_activity() occurs in\\nset_link_state() when handling an emulated USB reset, after the test\\nof dum-\u003eints_enabled and before the increment of dum-\u003ecallback_usage.\\nThis allowed another thread (doing a driver unbind) to sneak in and\\ngrab the spinlock, and then clear dum-\u003eints_enabled and dum-\u003edriver.\\nNormally this other thread would have to wait for dum-\u003ecallback_usage\\nto go down to 0 before it would clear dum-\u003edriver, but in this case it\\ndidn\u0027t have to wait since dum-\u003ecallback_usage had not yet been\\nincremented.\\n\\nThe fix is to increment dum-\u003ecallback_usage _before_ calling\\nstop_activity() instead of after. Then the thread doing the unbind\\nwill not clear dum-\u003edriver until after the call to\\nusb_gadget_udc_reset() safely returns and dum-\u003ecallback_usage has been\\ndecremented again.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/udc/dummy_hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"6350c7dd33ab481ef41c931a238361490c32d15c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"cc97fb5969177cccce2e23b31298df220fc7570d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"218886b2ef2dea7627d3700ab0abaf4bf9d1161f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"791966f85b439b261bf19865cf1c07c065ffb4b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"805b1833d6ed6da5086e610578a28e71bb54fbbb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"efbd9441f1e769a7aae1813d497cec09cbdff031\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"69ab97a693251d6a6093e630060a3c744fd58524\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7dbd8f4cabd96db5a50513de9d83a8105a5ffc81\",\"lessThan\":\"616a63ff495df12863692ab3f9f7b84e3fa7a66d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b416b9dac6ede26d4ca0c1a88b448b543623ff3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8590bc1da625dd4a589eac0fc3aa3cf4f400424d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a867d5b932ac4911d3f8a1e63505061b0c81f889\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e84b4a008365b7edbd842a063ae28d040a98db25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e39b17143a5b5aac81f066d455e5d3a9877eb3ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.2.97\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.16.52\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.1.46\",\"lessThan\":\"4.2\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.4.92\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.9.55\",\"lessThan\":\"4.10\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.13.6\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/udc/dummy_hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.168\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.134\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.81\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.22\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.12\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.2.97\",\"versionEndExcluding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"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T07:36:51+00:00",
"cve": "CVE-2026-43327",
"id": "CVE-2026-43327",
"initial_release_date": "2026-05-08T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: USB: dummy-hcd: Fix locking/synchronization error",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43327.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:18:44Z",
"cve": "CVE-2026-43327",
"id": "CVE-2026-43327",
"initial_release_date": "2026-05-13T03:35:20Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "580",
"product_status:known_not_affected": "140",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43327",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43327.json",
"version": "11"
}
}
}
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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.
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.
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