{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-43327", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43327", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-05-08T13:31:12.896Z", "updatedAt": "2026-05-23T16:06:42.428Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "USB: dummy-hcd: Fix locking/synchronization error", "summary": "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->lock spinlock. A call to stop_activity() occurs in\nset_link_state() when handling an emulated USB reset, after the test\nof dum->ints_enabled and before the increment of dum->callback_usage.\nThis allowed another thread (doing a driver unbind) to sneak in and\ngrab the spinlock, and then clear dum->ints_enabled and dum->driver.\nNormally this other thread would have to wait for dum->callback_usage\nto go down to 0 before it would clear dum->driver, but in this case it\ndidn't have to wait since dum->callback_usage had not yet been\nincremented.\n\nThe fix is to increment dum->callback_usage _before_ calling\nstop_activity() instead of after. Then the thread doing the unbind\nwill not clear dum->driver until after the call to\nusb_gadget_udc_reset() safely returns and dum->callback_usage has been\ndecremented again.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "6350c7dd33ab481ef41c931a238361490c32d15c" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "cc97fb5969177cccce2e23b31298df220fc7570d" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "218886b2ef2dea7627d3700ab0abaf4bf9d1161f" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "791966f85b439b261bf19865cf1c07c065ffb4b4" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "805b1833d6ed6da5086e610578a28e71bb54fbbb" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "efbd9441f1e769a7aae1813d497cec09cbdff031" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "69ab97a693251d6a6093e630060a3c744fd58524" }, { "version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81", "status": "affected", "versionType": "git", "lessThan": "616a63ff495df12863692ab3f9f7b84e3fa7a66d" }, { "version": "7b416b9dac6ede26d4ca0c1a88b448b543623ff3", "status": "affected", "versionType": "git" }, { "version": "8590bc1da625dd4a589eac0fc3aa3cf4f400424d", "status": "affected", "versionType": "git" }, { "version": "a867d5b932ac4911d3f8a1e63505061b0c81f889", "status": "affected", "versionType": "git" }, { "version": "e84b4a008365b7edbd842a063ae28d040a98db25", "status": "affected", "versionType": "git" }, { "version": "e39b17143a5b5aac81f066d455e5d3a9877eb3ae", "status": "affected", "versionType": "git" }, { "version": "4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715", "status": "affected", "versionType": "git" }, { "version": "3.2.97", "status": "affected", "versionType": "semver", "lessThan": "3.3" }, { "version": "3.16.52", "status": "affected", "versionType": "semver", "lessThan": "3.17" }, { "version": "4.1.46", "status": "affected", "versionType": "semver", "lessThan": "4.2" }, { "version": "4.4.92", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.9.55", "status": "affected", "versionType": "semver", "lessThan": "4.10" }, { "version": "4.13.6", "status": "affected", "versionType": "semver", "lessThan": "4.14" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.14" }, { "version": "5.10.253", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.203", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.168", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.134", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.81", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.22", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.12", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }