CVE-2026-64329

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In ucsi_ccg_remove(), ucsi_destroy() frees\nuc->ucsi (kfree) before free_irq() is called, so a handler invocation\nalready in flight may access the freed object after ucsi_destroy().\n\n CPU 0 (remove) | CPU 1 (threaded IRQ)\n ucsi_destroy(uc->ucsi) | ccg_irq_handler()\n kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE\n\nMove free_irq() before ucsi_destroy() in the remove path. It is kept\nafter ucsi_unregister(): ucsi_unregister() cancels connector work whose\nhandler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(),\nwhich waits for a completion that is signalled from the IRQ handler, so\nthe IRQ must stay active until that work has been cancelled.\n\nThe probe error path already orders free_irq() before ucsi_destroy().\n\nThis bug was found by static analysis."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/typec/ucsi/ucsi_ccg.c"], "versions": [{"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "f1adeb1ff8bef1467d6961059810795d02bbad5d", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "99381e762273a2410a3f0216000be32b013c0ea9", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "1a160076d3d0dcd4a98a4599ad96eec0790b099b", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "c32df11147822d22facee8fa30c2e8971d12f426", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "86c9ee928c4a370e323e432aaf8dca79c4ba7c85", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "f5c772b76bbd95de8be51cf849c6098f6af6fcf9", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "dbb500bad02146b388041877574829016591ddc8", "status": "affected", "versionType": "git"}, {"version": "e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2", "lessThan": "1f0bdc2884b67de337215079bba166df0cdf4ac5", "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/usb/typec/ucsi/ucsi_ccg.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.5", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": 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"https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8"}, {"url": "https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5"}], "title": "usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64329", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:35:12.425811Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:45.598Z"}}]}}

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In ucsi_ccg_remove(), ucsi_destroy() frees\nuc->ucsi (kfree) before free_irq() is called, so a handler invocation\nalready in flight may access the freed object after ucsi_destroy().\n\n CPU 0 (remove) | CPU 1 (threaded IRQ)\n ucsi_destroy(uc->ucsi) | ccg_irq_handler()\n kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE\n\nMove free_irq() before ucsi_destroy() in the remove path. It is kept\nafter ucsi_unregister(): ucsi_unregister() cancels connector work whose\nhandler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(),\nwhich waits for a completion that is signalled from the IRQ handler, so\nthe IRQ must stay active until that work has been cancelled.\n\nThe probe error path already orders free_irq() before ucsi_destroy().\n\nThis bug was found by static analysis."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.96", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.39", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.4", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:53:31.661Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64329", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:44:45.598Z", "dateReserved": "2026-07-19T15:36:31.780Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-25T08:49:57.098Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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In ucsi_ccg_remove(), ucsi_destroy() frees\nuc->ucsi (kfree) before free_irq() is called, so a handler invocation\nalready in flight may access the freed object after ucsi_destroy().\n\n CPU 0 (remove) | CPU 1 (threaded IRQ)\n ucsi_destroy(uc->ucsi) | ccg_irq_handler()\n kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE\n\nMove free_irq() before ucsi_destroy() in the remove path. It is kept\nafter ucsi_unregister(): ucsi_unregister() cancels connector work whose\nhandler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(),\nwhich waits for a completion that is signalled from the IRQ handler, so\nthe IRQ must stay active until that work has been cancelled.\n\nThe probe error path already orders free_irq() before ucsi_destroy().\n\nThis bug was found by static analysis."}], "id": "CVE-2026-64329", "lastModified": "2026-11-06T17:18:48.137", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64329", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:35:12.425811Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:14.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a160076d3d0dcd4a98a4599ad96eec0790b099b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86c9ee928c4a370e323e432aaf8dca79c4ba7c85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99381e762273a2410a3f0216000be32b013c0ea9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c32df11147822d22facee8fa30c2e8971d12f426"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1adeb1ff8bef1467d6961059810795d02bbad5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5c772b76bbd95de8be51cf849c6098f6af6fcf9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove", "id": "2507083", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507083"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["A flaw was found in the Linux kernel's USB Type-C UCSI CCG driver. A use-after-free vulnerability occurs during the removal of a USB Type-C device. Specifically, the system attempts to free a memory object before ensuring that all related interrupt handling routines have completed. This timing issue could allow an attacker to potentially access freed memory, leading to system instability or a denial of service."], "name": "CVE-2026-64329", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64329\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64329\nhttps://lore.kernel.org/linux-cve-announce/2026072513-CVE-2026-64329-017c@gregkh/T"], "threat_severity": "Moderate"}

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