142 lines
7.7 KiB
JSON
142 lines
7.7 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-2026-80954",
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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": "2026-08-26T14:34:25.804Z",
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"datePublished": "2026-09-11T19:42:23.169Z",
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"dateUpdated": "2026-10-19T08:45:38.169Z"
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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": "2026-10-19T08:45:38.169Z"
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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\ni3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()\n\ni3c_device_get_supported_xfer_mode() uses dev->desc to obtain the\nmaster controller. However, dev->desc must not be dereferenced unless\nbus->lock is held, and this function does not take that lock.\n\nThe function only needs access to the master controller associated with\nthe device's bus. Use dev->bus instead, which is always valid for the\nlifetime of the device and does not require dereferencing dev->desc."
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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 unlocked desc dereference is reached from local IIO sysfs reads of an I3C-backed MMC5633 magnetometer (in_magn_*_raw/in_temp_raw via iio_read_channel_info) and from /dev/iio:deviceN; I3C is an on-board host bus with no network or Bluetooth packet path.\nAC:L - A local attacker can loop those IIO reads while concurrently forcing Dynamic Address Assignment, which replaces and kfree()s i3c_dev_desc (hot-join, MIPI I3C HCI/Renesas resume re-DAA, or sysfs do_daa). The attacker drives the unlocked-read side and can retry until it races with DAA.\nPR:L - IIO channel attributes are created 0444/0644 and iio_read_channel_info performs no capability check, so an unprivileged local user on Android, automotive, or embedded I3C boards can invoke mmc5633_read_raw without init-namespace root.\nUI:N - The attacker performs their own sysfs or IIO chardev reads against an already-present I3C device; no separate victim action such as plugging hardware or mounting a filesystem is required.\nS:U - The use-after-free corrupts an i3c_dev_desc in the host kernel heap and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Unlocked load of dev->desc races with DAA's i3c_master_free_i3c_dev(), so i3c_dev_get_master() walks a freed descriptor (common.master then this->info.hdr_cap). Reclaiming that object yields a kernel read primitive; UAF is High confidentiality.\nI:H - A sprayed fake i3c_dev_desc lets the nested pointer walk interpret attacker-controlled heap as kernel objects, enabling further writes and control-flow hijack through the same freed slab; UAF is High integrity.\nA:H - Dereferencing a NULL or freed desc in i3c_dev_get_master() causes a kernel oops or panic even without a full exploit, so availability impact is High."
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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/i3c/device.c",
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"drivers/i3c/internals.h",
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"drivers/i3c/master.c"
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],
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"versions": [
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{
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"version": "256a21743d911f94ce92fe28f793cd586f3860b2",
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"lessThan": "251db58324ea4792c3f9f692ab09be148e051969",
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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": "256a21743d911f94ce92fe28f793cd586f3860b2",
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"lessThan": "8bed7f4fa710914b7f05fd59998316bfb4d43385",
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"status": "affected",
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"versionType": "git"
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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/i3c/device.c",
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"drivers/i3c/internals.h",
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"drivers/i3c/master.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.2.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969"
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},
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{
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"url": "https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385"
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}
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],
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"title": "i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |