180 lines
9.9 KiB
JSON
180 lines
9.9 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-2026-89941",
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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": "2026-09-11T19:38:34.777Z",
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"datePublished": "2026-09-16T10:32:29.148Z",
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"dateUpdated": "2026-10-19T08:55:15.605Z"
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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": "2026-10-19T08:55:15.605Z"
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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\niio: buffer: Make IIO DMA fence release RCU-safe\n\nThe `dma_fence` documentation states that if a custom release\nimplementation is provided, the `dma_fence` object must be freed in an\nRCU-safe way. The current `iio_dma_fence` implementation uses `kfree()`,\nwhich might result in a use-after-free.\n\nRemove the custom `release` implementation. This makes the DMA fence core\nfall back to `dma_fence_free()`, which calls `kfree_rcu()` on the fence.\nThis requires that the fence be the first member of `struct iio_dma_fence`.\n\nUsing the default release method for extended DMA fence structures is a\ncommon pattern."
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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 use-after-free is reached only through local IIO character-device ioctls (IIO_BUFFER_GET_FD_IOCTL then IIO_BUFFER_DMABUF_ATTACH/ENQUEUE_IOCTL on /dev/iio:deviceN); there is no network, Bluetooth, or USB packet path into the IIO DMA fence release.\nAC:L - The attacker controls both sides of the race by enqueueing IIO DMA-BUF transfers that create and later kfree() the fence while concurrently waiting on or exporting the same dma-buf's reservation fences via DMA_BUF_IOCTL_SYNC/EXPORT_SYNC_FILE, so the missing RCU grace period is attacker-driven.\nPR:L - The IIO open and ioctl path performs no capability check; only filesystem access to /dev/iio:deviceN is required. On Android, automotive, and industrial/SDR systems that ship DMA-capable IIO converters, that node is commonly group-accessible to unprivileged sensor or application users.\nUI:N - The attacker opens the IIO device, attaches their own DMA-BUF, and issues enqueue and dma-buf sync/export ioctls themselves; no separate victim action is required.\nS:U - The freed iio_dma_fence lives in the host kernel heap and any resulting corruption stays within the same kernel security authority; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - Immediate kfree() of the dma_fence lets concurrent dma_resv RCU walkers (dma_fence_get_rcu, dma_fence_driver_name) read the reclaimed slab object; per kernel scoring guidance a use-after-free is High confidentiality impact.\nI:H - The freed dma_fence contains ops function pointers, callback lists, and a spinlock used after free; reclaiming the object with attacker-controlled data yields write and control-flow hijack primitives, so integrity impact is High.\nA:H - Use-after-free of the fence from dma_fence_release or dma_resv iteration 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/iio/industrialio-buffer.c"
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],
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"versions": [
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{
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"version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
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"lessThan": "311595dc0b5621f74d8eb4dc38ef4efcdfe7e769",
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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": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
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"lessThan": "06a9460b8b792e109cbc934a856d02e5cff217ef",
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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": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
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"lessThan": "11cef99491117d4264603df159c4ff5f3845a059",
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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": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f",
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"lessThan": "8662e56c31cf23b61ca3d11b516efb94c35b8026",
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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/iio/industrialio-buffer.c"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.110",
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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": "6.18.51",
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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": "7.2.5",
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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": "6.11",
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"versionEndExcluding": "6.12.110"
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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": "6.11",
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"versionEndExcluding": "6.18.51"
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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": "6.11",
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"versionEndExcluding": "7.2.5"
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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": "6.11",
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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/311595dc0b5621f74d8eb4dc38ef4efcdfe7e769"
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},
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{
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"url": "https://git.kernel.org/stable/c/06a9460b8b792e109cbc934a856d02e5cff217ef"
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},
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{
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"url": "https://git.kernel.org/stable/c/11cef99491117d4264603df159c4ff5f3845a059"
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},
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{
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"url": "https://git.kernel.org/stable/c/8662e56c31cf23b61ca3d11b516efb94c35b8026"
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}
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],
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"title": "iio: buffer: Make IIO DMA fence release RCU-safe",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |