180 lines
10 KiB
JSON
180 lines
10 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-2026-68152",
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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": "2026-07-30T09:28:09.371Z",
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"datePublished": "2026-08-10T11:59:18.270Z",
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"dateUpdated": "2026-08-17T04:59:47.614Z"
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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": "2026-08-17T04:59:47.614Z"
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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\namt: fix use-after-free in AMT delayed works\n\nWhen an AMT device is removed, pending delayed works can still access\nthe freed amt_dev structure, which may result in kernel crashes or\nmemory corruption.\n\namt_dev_stop() cancels req_wq and discovery_wq with\ncancel_delayed_work_sync(), but these works can be scheduled again\nfrom event_wq after the cancellation. This allows delayed works to\naccess the freed amt_dev structure after the netdev has been released.\n\nThe following is a simple race scenario:\n\nCPU0 CPU1\n\namt_dev_stop()\ncancel_delayed_work_sync()\n amt_event_work()\n mod_delayed_work(req_wq)\nfree netdev\n req_wq accesses freed amt_dev\n\nUse disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and\ndiscovery_wq from being queued again and wait for running work items\nto complete.\n\nThe delayed works are disabled after initialization in\namt_newlink() and enabled only when the device is successfully opened.\nThis keeps the delayed work lifecycle synchronized with the lifetime\nof the AMT device."
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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 - Exploitation requires triggering amt_dev_stop() via local rtnetlink (RTM_DELLINK/ip link del) or ndo_stop on an AMT gateway netdev; the UAF race in teardown is not reachable by remote UDP alone without this privileged local device-removal path.\nAC:L - The attacker controls both sides of the race by concurrently deleting/bringing down the AMT interface while flooding AMT UDP packets or letting discovery/request timers fire, reliably re-queuing req_wq/discovery_wq via amt_event_work during the cancel_work_sync window.\nPR:L - Creating, opening, and removing AMT virtual interfaces requires CAP_NET_ADMIN via rtnetlink, which unprivileged users can obtain inside a user network namespace (unshare -Urn), but not without any privileges at all.\nUI:N - No victim user interaction is required; a single attacker with namespace CAP_NET_ADMIN can create an AMT gateway, bring it up, and race interface teardown against self-generated AMT traffic or delayed-work events.\nS:U - Successful exploitation corrupts kernel heap memory and can escalate privileges within the same kernel, but does not inherently cross VM, container, or IOMMU security boundaries into a separate authority domain.\nC:H - Use-after-free of the amt_dev structure embedded in netdev private data allows accessing attacker-influenced freed heap memory, enabling arbitrary kernel memory disclosure through standard UAF exploitation techniques.\nI:H - The UAF on amt_dev delayed-work handlers can corrupt kernel heap metadata and adjacent objects, providing primitives for arbitrary kernel memory writes and potential code execution as acknowledged in the fix commit.\nA:H - Use-after-free in amt_req_work/amt_discovery_work accessing freed amt_dev during netdev teardown can cause kernel oops, panic, or hang, and the fix commit explicitly warns of kernel crashes and memory corruption."
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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/net/amt.c"
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],
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"versions": [
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{
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"version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
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"lessThan": "a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cbc21dc1cfe949e37b2a54c71511579f1899e8d4",
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"lessThan": "1a644db2cf59f164cdf3c75995bab5aadc097528",
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"status": "affected",
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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/net/amt.c"
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],
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"versions": [
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{
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"version": "5.16",
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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": "5.16",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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],
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"cpeApplicability": [
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"versionStartIncluding": "5.16",
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"versionEndExcluding": "6.12.101"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a46bfa01e01df0f6f6dc4b0be18db002d6d2dbd2"
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},
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{
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"url": "https://git.kernel.org/stable/c/1a644db2cf59f164cdf3c75995bab5aadc097528"
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},
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{
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"url": "https://git.kernel.org/stable/c/006340cf06881b6ff49767d8b6f3c4f7b892670c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ea20c44935d6142daecfa9b39d635033a7553e1b"
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}
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],
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"title": "amt: fix use-after-free in AMT delayed works",
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