CVE-2026-43327

{"id": "CVE-2026-43327", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["drivers/usb/gadget/udc/dummy_hcd.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.14"}, {"status": "unaffected", "version": "0", "lessThan": "4.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.253", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.168", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.134", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/gadget/udc/dummy_hcd.c"], "defaultStatus": "affected"}]}], "published": "2026-05-08T14:16:42.243", "references": [{"url": "https://git.kernel.org/stable/c/218886b2ef2dea7627d3700ab0abaf4bf9d1161f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/616a63ff495df12863692ab3f9f7b84e3fa7a66d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6350c7dd33ab481ef41c931a238361490c32d15c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/69ab97a693251d6a6093e630060a3c744fd58524", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/791966f85b439b261bf19865cf1c07c065ffb4b4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/805b1833d6ed6da5086e610578a28e71bb54fbbb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cc97fb5969177cccce2e23b31298df220fc7570d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/efbd9441f1e769a7aae1813d497cec09cbdff031", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-667"}]}], "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->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."}], "lastModified": "2026-06-17T10:49:23.337", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "53EFF502-4DAC-47BB-88FE-57DAEB8A756F", "versionEndExcluding": "3.3", "versionStartIncluding": "3.2.97"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "05033BFD-A5E6-4D50-861A-0DFC71F68928", "versionEndExcluding": "3.17", "versionStartIncluding": "3.16.52"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FD7B43DB-D99B-4203-84D2-00416A5FC499", "versionEndExcluding": "4.2", "versionStartIncluding": "4.1.46"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0FC36FA2-9326-4373-A290-AD56F4EBE515", "versionEndExcluding": "4.5", "versionStartIncluding": "4.4.92"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FF00429D-1E4D-4240-A156-ECC8962E597D", "versionEndExcluding": "4.10", "versionStartIncluding": "4.9.55"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7144BCBC-124B-49FA-8BCC-259910F77E5A", "versionEndExcluding": "5.10.253", "versionStartIncluding": "4.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B", "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F56F925B-BAF8-4F4B-B62F-1496AF19A307", "versionEndExcluding": "6.6.134", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6EF80433-B33B-43C5-8E64-0FA7B8DCE1BC", "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}