{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43324", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.002Z", "datePublished": "2026-05-08T13:31:08.850Z", "dateUpdated": "2026-05-11T22:22:21.856Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:22:21.856Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: dummy-hcd: Fix interrupt synchronization error\n\nThis fixes an error in synchronization in the dummy-hcd driver. The\nerror has a somewhat involved history. The synchronization mechanism\nwas introduced by commit 7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous\nsynchronization change\"), which added an emulated \"interrupts enabled\"\nflag together with code emulating synchronize_irq() (it waits until\nall current handler callbacks have returned).\n\nBut the emulated interrupt-disable occurred too late, after the driver\ncontaining the handler callback routines had been told that it was\nunbound and no more callbacks would occur. Commit 4a5d797a9f9c (\"usb:\ngadget: dummy_hcd: fix gpf in gadget_setup\") tried to fix this by\nmoving the synchronize_irq() emulation code from dummy_stop() to\ndummy_pullup(), which runs before the unbind callback.\n\nThere still were races, though, because the emulated interrupt-disable\nstill occurred too late. It couldn't be moved to dummy_pullup(),\nbecause that routine can be called for reasons other than an impending\nunbind. Therefore commits 7dc0c55e9f30 (\"USB: UDC core: Add\nudc_async_callbacks gadget op\") and 04145a03db9d (\"USB: UDC: Implement\nudc_async_callbacks in dummy-hcd\") added an API allowing the UDC core\nto tell dummy-hcd exactly when emulated interrupts and their callbacks\nshould be disabled.\n\nThat brings us to the current state of things, which is still wrong\nbecause the emulated synchronize_irq() occurs before the emulated\ninterrupt-disable! That's no good, beause it means that more emulated\ninterrupts can occur after the synchronize_irq() emulation has run,\nleading to the possibility that a callback handler may be running when\nthe gadget driver is unbound.\n\nTo fix this, we have to move the synchronize_irq() emulation code yet\nagain, to the dummy_udc_async_callbacks() routine, which takes care of\nenabling and disabling emulated interrupt requests. The\nsynchronization will now run immediately after emulated interrupts are\ndisabled, which is where it belongs."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/udc/dummy_hcd.c"], "versions": [{"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "d847f375b1bcea713143bc02720d13d2d01b012a", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "5aa776c8615bea3b1eaeec87b0788375800ead4f", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "94d4fab1dd9e64f45449bcc7d6a5acf796b13015", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "5687a09776069bd915560021c9728ca528440128", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7", "status": "affected", "versionType": "git"}, {"version": "04145a03db9d78469e0817ab3a767c76c0fb0947", "lessThan": "2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/udc/dummy_hcd.c"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d847f375b1bcea713143bc02720d13d2d01b012a"}, {"url": "https://git.kernel.org/stable/c/cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4"}, {"url": "https://git.kernel.org/stable/c/5aa776c8615bea3b1eaeec87b0788375800ead4f"}, {"url": "https://git.kernel.org/stable/c/94d4fab1dd9e64f45449bcc7d6a5acf796b13015"}, {"url": "https://git.kernel.org/stable/c/5687a09776069bd915560021c9728ca528440128"}, {"url": "https://git.kernel.org/stable/c/8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7"}, {"url": "https://git.kernel.org/stable/c/2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541"}], "title": "USB: dummy-hcd: Fix interrupt synchronization error", "x_generator": {"engine": "bippy-1.2.0"}}}}

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The\nerror has a somewhat involved history. The synchronization mechanism\nwas introduced by commit 7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous\nsynchronization change\"), which added an emulated \"interrupts enabled\"\nflag together with code emulating synchronize_irq() (it waits until\nall current handler callbacks have returned).\n\nBut the emulated interrupt-disable occurred too late, after the driver\ncontaining the handler callback routines had been told that it was\nunbound and no more callbacks would occur. Commit 4a5d797a9f9c (\"usb:\ngadget: dummy_hcd: fix gpf in gadget_setup\") tried to fix this by\nmoving the synchronize_irq() emulation code from dummy_stop() to\ndummy_pullup(), which runs before the unbind callback.\n\nThere still were races, though, because the emulated interrupt-disable\nstill occurred too late. It couldn't be moved to dummy_pullup(),\nbecause that routine can be called for reasons other than an impending\nunbind. Therefore commits 7dc0c55e9f30 (\"USB: UDC core: Add\nudc_async_callbacks gadget op\") and 04145a03db9d (\"USB: UDC: Implement\nudc_async_callbacks in dummy-hcd\") added an API allowing the UDC core\nto tell dummy-hcd exactly when emulated interrupts and their callbacks\nshould be disabled.\n\nThat brings us to the current state of things, which is still wrong\nbecause the emulated synchronize_irq() occurs before the emulated\ninterrupt-disable! That's no good, beause it means that more emulated\ninterrupts can occur after the synchronize_irq() emulation has run,\nleading to the possibility that a callback handler may be running when\nthe gadget driver is unbound.\n\nTo fix this, we have to move the synchronize_irq() emulation code yet\nagain, to the dummy_udc_async_callbacks() routine, which takes care of\nenabling and disabling emulated interrupt requests. The\nsynchronization will now run immediately after emulated interrupts are\ndisabled, which is where it belongs."}], "id": "CVE-2026-43324", "lastModified": "2026-05-15T18:14:11.503", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-08T14:16:41.060", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2ca9e46f8f1f5a297eb0ac83f79d35d5b3a02541"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5687a09776069bd915560021c9728ca528440128"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5aa776c8615bea3b1eaeec87b0788375800ead4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bcd80219d8e10e660bf29b20e41bb8beb4e4cb7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94d4fab1dd9e64f45449bcc7d6a5acf796b13015"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d847f375b1bcea713143bc02720d13d2d01b012a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: USB: dummy-hcd: Fix interrupt synchronization error", "id": "2468087", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468087"}, "csaw": false, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's dummy-hcd driver. This vulnerability stems from an interrupt synchronization error where emulated interrupts can occur after the system attempts to synchronize interrupt handlers. This timing issue creates a race condition, potentially allowing a callback handler to execute when the associated gadget driver is no longer bound, which could lead to system instability or unexpected behavior."], "name": "CVE-2026-43324", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43324\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43324\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43324.mbox"]}

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