CVE-2026-89941

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89941", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.777Z", "datePublished": "2026-09-16T10:32:29.148Z", "dateUpdated": "2026-10-19T08:55:15.605Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:55:15.605Z"}, "descriptions": [{"lang": "en", "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iio/industrialio-buffer.c"], "versions": [{"version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "lessThan": "311595dc0b5621f74d8eb4dc38ef4efcdfe7e769", "status": "affected", "versionType": "git"}, {"version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "lessThan": "06a9460b8b792e109cbc934a856d02e5cff217ef", "status": "affected", "versionType": "git"}, {"version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "lessThan": "11cef99491117d4264603df159c4ff5f3845a059", "status": "affected", "versionType": "git"}, {"version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "lessThan": "8662e56c31cf23b61ca3d11b516efb94c35b8026", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iio/industrialio-buffer.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/311595dc0b5621f74d8eb4dc38ef4efcdfe7e769"}, {"url": "https://git.kernel.org/stable/c/06a9460b8b792e109cbc934a856d02e5cff217ef"}, {"url": "https://git.kernel.org/stable/c/11cef99491117d4264603df159c4ff5f3845a059"}, {"url": "https://git.kernel.org/stable/c/8662e56c31cf23b61ca3d11b516efb94c35b8026"}], "title": "iio: buffer: Make IIO DMA fence release RCU-safe", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iio/industrialio-buffer.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "311595dc0b5621f74d8eb4dc38ef4efcdfe7e769", "status": "affected", "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "versionType": "git"}, {"lessThan": "06a9460b8b792e109cbc934a856d02e5cff217ef", "status": "affected", "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "versionType": "git"}, {"lessThan": "11cef99491117d4264603df159c4ff5f3845a059", "status": "affected", "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "versionType": "git"}, {"lessThan": "8662e56c31cf23b61ca3d11b516efb94c35b8026", "status": "affected", "version": "3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iio/industrialio-buffer.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-89941", "lastModified": "2026-10-19T09:18:39.923", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:17:03.733", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06a9460b8b792e109cbc934a856d02e5cff217ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11cef99491117d4264603df159c4ff5f3845a059"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/311595dc0b5621f74d8eb4dc38ef4efcdfe7e769"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8662e56c31cf23b61ca3d11b516efb94c35b8026"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f,311595dc0b5621f74d8eb4dc38ef4efcdfe7e769)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f,06a9460b8b792e109cbc934a856d02e5cff217ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f,11cef99491117d4264603df159c4ff5f3845a059)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3e26d9f08fbe0b73e951a5e810fdb7a332b7e37f,8662e56c31cf23b61ca3d11b516efb94c35b8026)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.51,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-16T21:30:06.346738+00:00", "updated": "2026-09-18T08:15:06.138553+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}