383 lines
19 KiB
JSON
383 lines
19 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-2021-47153",
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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": "2024-03-04T18:12:48.846Z",
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"datePublished": "2024-03-25T09:07:47.873Z",
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"dateUpdated": "2026-08-05T08:46:21.812Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:46:21.812Z"
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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\ni2c: i801: Don't generate an interrupt on bus reset\n\nNow that the i2c-i801 driver supports interrupts, setting the KILL bit\nin a attempt to recover from a timed out transaction triggers an\ninterrupt. Unfortunately, the interrupt handler (i801_isr) is not\nprepared for this situation and will try to process the interrupt as\nif it was signaling the end of a successful transaction. In the case\nof a block transaction, this can result in an out-of-range memory\naccess.\n\nThis condition was reproduced several times by syzbot:\nhttps://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e\nhttps://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e\nhttps://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e\nhttps://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb\nhttps://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a\nhttps://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79\n\nSo disable interrupts while trying to reset the bus. Interrupts will\nbe enabled again for the following transaction."
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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 path is reached locally via /dev/i2c-* I2C_SMBUS ioctls into i801_access → i801_block_transaction_byte_by_byte → i801_check_post; it is not reachable from network packet processing or physical SMBus injection.\nAC:L - An attacker who can open the adapter can issue block SMBus transactions and force wait_event_timeout to expire (including via I2C_TIMEOUT), reliably hitting the KILL path that leaves INTREN set; syzbot reproduced this repeatedly with no attacker-uncontrollable race required.\nPR:L - i2cdev_open() performs no capability check—access is only DAC on /dev/i2c-*. On realistic worst-case deployments (i2c group or similarly relaxed permissions on developer/embedded/x86 systems with Intel PCH SMBus), a non-root local user can reach the path.\nUI:N - The attacker opens the device and issues the ioctls themselves; no separate victim action is required.\nS:U - Impact is ordinary in-kernel stack/memory corruption within the host kernel authority, not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The ISR performs out-of-range accesses on the block buffer (KASAN OOB reads) and related crashes show use-after-free of that buffer; this class of memory corruption is scored as enabling high confidentiality impact under the higher-severity rule.\nI:H - Syzbot also hit out-of-bounds/use-after-free writes in i801_isr_byte_done for the same root cause (KILL-generated interrupt while INTREN remains set), giving stack/heap corruption exploitable for control-flow hijacking.\nA:H - The memory-safety failure reliably produces kernel oops/KASAN reports and can panic the system, which is Availability High under kernel CVSS guidance."
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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/i2c/busses/i2c-i801.c"
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