{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80952", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.804Z", "datePublished": "2026-09-11T19:42:21.868Z", "dateUpdated": "2026-10-19T08:45:36.170Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:36.170Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: Fix info leak and UAF in device unregister path\n\ni3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before\ncalling device_unregister(). During device_unregister(),\ndevice_del() emits a KOBJ_REMOVE uevent and unbinds the driver while\nthe device descriptor is still expected to be valid. As a result,\ni3c_device_uevent() and a racing modalias_show() can observe a NULL\ndesc and fall back to an uninitialized stack struct i3c_device_info,\nleaking kernel stack contents in the generated modalias. Driver\n.remove() callbacks may also encounter an unexpected NULL desc during\nunbind.\n\nKeep desc valid until device_unregister() has completed. Since\ndevice_unregister() drops the device reference and may free the device,\ntake an extra reference with get_device() before unregistering. Clear\ndesc afterwards and release the extra reference with put_device().\nThis preserves the release-time invariant that desc must be NULL while\navoiding both the information leak and a potential use-after-free from\nwriting desc after the device has been released." } ], "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 bug is in i3c_master_unregister_i3c_devs(), reached only from I3C master platform/PCI driver .remove() (sysfs unbind, rmmod, or controller teardown). No network, Bluetooth, or remote packet path enters this unregister sequence.\nAC:L - Clearing desc before device_unregister() deterministically poisons KOBJ_REMOVE uevent/modalias, and the later device free races with in-flight IBI work still holding desc->dev. An attacker looping bind/unbind while sensors generate IBIs or while reading sysfs modalias controls both sides of the race.\nPR:L - Per CNA driver-removal UAF precedent (including CVE-2024-49874 on this same i3c_master_unregister path), an unprivileged local user can drive the IBI/sysfs side via world-readable I3C modalias and IIO/hwmon/MCTP clients while teardown proceeds; init-namespace root is not the minimum privilege bar.\nUI:N - No separate victim action is required; the attacker reads sysfs/uevents and/or sustains I3C IBI traffic themselves and piggybacks on driver removal without another user opening files or mounting filesystems.\nS:U - Impact is kernel heap use-after-free and stack disclosure within the host kernel. This is not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - i3c_device_uevent() and a racing modalias_show() leak uninitialized kernel stack into MODALIAS when desc is NULL. After device_unregister() drops the last reference, i3c_master_handle_ibi() can invoke the IBI handler with a freed i3c_device, a heap UAF that enables arbitrary kernel read.\nI:H - In-flight i3c_master_handle_ibi() still calls ibi->handler() on the dangling i3c_device after it is freed, and driver .remove() may skip i3c_device_disable_ibi() because desc was already cleared. Heap reuse of that object yields write and control-flow hijack primitives.\nA:H - Use-after-free of the i3c_device during unregister, and unexpected NULL desc in driver .remove() callbacks, can oops or panic the kernel even when the UAF is not fully exploited for code execution." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/i3c/master.c" ], "versions": [ { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "109995153898454c7795c2c299fd0a0b57456a4b", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "c64daaaba08e490c8347ff60aacac4dd51249f91", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "ef72ff6650c4ebf2b444708d84df66db42f262d9", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "94fb9786d67a8f8b899e77381620f86bad94fdf7", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "4837be0f9ac2efe5e83b35a696b6242c473d280c", "status": "affected", "versionType": "git" }, { "version": "3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0", "lessThan": "d2c743efd2d1ee64e94324664808f623dd865872", "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/i3c/master.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "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": "5.0", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e" }, { "url": "https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b" }, { "url": "https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91" }, { "url": "https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9" }, { "url": "https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49" }, { "url": "https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7" }, { "url": "https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c" }, { "url": "https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872" } ], "title": "i3c: master: Fix info leak and UAF in device unregister path", "x_generator": { "engine": "bippy-1.2.0" } } } }