243 lines
15 KiB
JSON
243 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43324",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:56.002Z",
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"datePublished": "2026-05-08T13:31:08.850Z",
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"dateUpdated": "2026-08-05T12:27:14.134Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:27:14.134Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable dummy-hcd path is reached through local USB gadget/host emulator interfaces such as raw-gadget, usbfs, configfs, or sysfs unbind paths. It is not network-reachable and dummy-hcd is an in-kernel emulator rather than a physically attached USB device.\nAC:L - Although this is a race, a local attacker can drive both sides by generating emulated USB activity while triggering gadget driver unbind, and the race can be retried. There are no special external conditions beyond attacker-controlled timing.\nPR:L - Exploitation requires local access to the configured dummy-hcd/gadget userspace interfaces, but the relevant raw-gadget and usbfs paths do not themselves impose a kernel capability check once accessible. When uncertain between root-only setup and normal local device access, the higher-severity PR:L is appropriate.\nUI:N - No victim action is needed after the attacker has local access to the relevant device interfaces. The attacker can trigger emulated USB callbacks and unbind locally.\nS:U - The impact remains within the same kernel security authority. This is a standard local kernel memory-safety/availability issue, not a VM escape or cross-authority boundary violation.\nC:H - The synchronization bug can allow asynchronous gadget callbacks to run after or during gadget driver unbind, leaving callback code operating on stale or cleared gadget-driver state. This is a use-after-unbind/use-after-free class condition, so kernel memory disclosure is a defensible worst-case impact.\nI:H - Callback execution against freed or invalid gadget-driver state can be leveraged as kernel memory corruption rather than merely a clean failure. Under the required higher-severity rule, a UAF-style kernel race supports potential arbitrary write or code execution.\nA:H - At minimum, the race can crash the kernel through NULL dereference or stale pointer use in gadget callbacks, as related dummy-hcd synchronization bugs have done. Kernel oops/panic is high availability impact."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/udc/dummy_hcd.c"
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],
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"versions": [
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{
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"lessThan": "d847f375b1bcea713143bc02720d13d2d01b012a",
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"status": "affected",
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"lessThan": "cbf7df5e5d27cd5bea92ee9a75a4b28dbcc718d4",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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{
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"version": "04145a03db9d78469e0817ab3a767c76c0fb0947",
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"lessThan": "5687a09776069bd915560021c9728ca528440128",
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"status": "affected",
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"versionType": "git"
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{
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"version": "04145a03db9d78469e0817ab3a767c76c0fb0947",
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"status": "affected",
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{
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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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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/udc/dummy_hcd.c"
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],
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"versions": [
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{
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"version": "5.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.203",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.168",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.134",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.81",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.22",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"url": "https://git.kernel.org/stable/c/5687a09776069bd915560021c9728ca528440128"
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}
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],
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"title": "USB: dummy-hcd: Fix interrupt synchronization error",
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