329 lines
16 KiB
JSON
329 lines
16 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-2021-47358",
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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": "2024-05-21T14:28:16.988Z",
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"datePublished": "2024-05-21T14:44:50.221Z",
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"dateUpdated": "2026-08-05T08:47:27.000Z"
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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": "2026-08-05T08:47:27.000Z"
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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\nstaging: greybus: uart: fix tty use after free\n\nUser space can hold a tty open indefinitely and tty drivers must not\nrelease the underlying structures until the last user is gone.\n\nSwitch to using the tty-port reference counter to manage the life time\nof the greybus tty state to avoid use after free after a disconnect."
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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 local access to open and operate on /dev/ttyGB*; the UAF is triggered via local tty syscalls after the greybus UART device is disconnected, matching other greybus disconnect-UAF scores.\nAC:L - The attacker reliably causes the bug by holding the tty open across disconnect and then using the fd; this is a deterministic lifetime violation, not a race or layout-dependent condition beyond attacker control.\nPR:L - An unprivileged local user who can open the greybus tty device is sufficient; no root or init-namespace capabilities are required for the open/use path.\nUI:N - No separate victim action is required; the attacker opens the device and continues using it after disconnect.\nS:U - Impact is confined to the host kernel (memory corruption / privilege escalation within the same security authority); it does not cross a VM, IOMMU, or other security boundary.\nC:H - Use-after-free of the gb_tty/tty_port object allows reclaim and controlled reads of freed kernel heap memory.\nI:H - UAF of a structure embedding tty_port ops enables heap spray and hijacking of function pointers on subsequent close/write paths for arbitrary write/code execution.\nA:H - Dereferencing the freed gb_tty on close, write, or cleanup causes kernel oops/panic even without full exploitation."
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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/staging/greybus/uart.c"
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],
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{
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"status": "affected",
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"product": "Linux",
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"defaultStatus": "affected",
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"drivers/staging/greybus/uart.c"
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],
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"versions": [
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{
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"version": "4.9",
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"status": "affected"
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},
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{
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"version": "0",
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"status": "unaffected",
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},
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"version": "4.9.285",
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"lessThanOrEqual": "4.9.*",
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"status": "unaffected",
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},
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{
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"version": "4.14.249",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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},
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{
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"version": "4.19.209",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.150",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.70",
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"lessThanOrEqual": "5.10.*",
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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": "5.14.9",
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"lessThanOrEqual": "5.14.*",
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"status": "unaffected",
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"versionType": "semver"
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{
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"version": "5.15",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"timestamp": "2024-05-21T18:24:46.611586Z"
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