CVE-2026-80954

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80954", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.804Z", "datePublished": "2026-09-11T19:42:23.169Z", "dateUpdated": "2026-10-19T08:45:38.169Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:38.169Z"}, "descriptions": [{"lang": "en", "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."}], "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 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/i3c/device.c", "drivers/i3c/internals.h", "drivers/i3c/master.c"], "versions": [{"version": "256a21743d911f94ce92fe28f793cd586f3860b2", "lessThan": "251db58324ea4792c3f9f692ab09be148e051969", "status": "affected", "versionType": "git"}, {"version": "256a21743d911f94ce92fe28f793cd586f3860b2", "lessThan": "8bed7f4fa710914b7f05fd59998316bfb4d43385", "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/device.c", "drivers/i3c/internals.h", "drivers/i3c/master.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "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": "6.19", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969"}, {"url": "https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385"}], "title": "i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/i3c/device.c", "drivers/i3c/internals.h", "drivers/i3c/master.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "251db58324ea4792c3f9f692ab09be148e051969", "status": "affected", "version": "256a21743d911f94ce92fe28f793cd586f3860b2", "versionType": "git"}, {"lessThan": "8bed7f4fa710914b7f05fd59998316bfb4d43385", "status": "affected", "version": "256a21743d911f94ce92fe28f793cd586f3860b2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/i3c/device.c", "drivers/i3c/internals.h", "drivers/i3c/master.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "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\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."}], "id": "CVE-2026-80954", "lastModified": "2026-10-19T09:17:26.860", "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": "2026-09-11T20:19:01.167", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: i3c driver unlocked dereference leading to system instability", "id": "2532524", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532524"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's i3c driver. The `i3c_device_get_supported_xfer_mode()` function attempts to access a device descriptor without holding the necessary lock. This unlocked dereference can lead to memory corruption, potentially causing system instability or a denial of service."], "name": "CVE-2026-80954", "public_date": "2026-09-11T19:42:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80954\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80954\nhttps://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969\nhttps://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[256a21743d911f94ce92fe28f793cd586f3860b2,251db58324ea4792c3f9f692ab09be148e051969)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[256a21743d911f94ce92fe28f793cd586f3860b2,8bed7f4fa710914b7f05fd59998316bfb4d43385)"}}], "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": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "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": "2026-09-13T12:00:04.611735+00:00", "updated": "2026-09-21T04:15:08.802566+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}