CVE-2026-46021

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which may race with\na governor update via sysfs and may lead to a use-after-free in that\ncase.\n\nAddress these issues by adding two thermal_set_governor() calls, one to\nthermal_release() to remove the governor from the given thermal zone,\nand one to the thermal zone registration error path to cover failures\npreceding the thermal zone device registration."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/thermal/thermal_core.c"], "versions": [{"version": "e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8", "lessThan": "a172fa18bc370b776ac1510abb0dcb50a7a35fac", "status": "affected", "versionType": "git"}, {"version": "e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8", "lessThan": "8e563d8db50f303171aceb79eec0807e7ba06951", "status": "affected", "versionType": "git"}, {"version": "e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8", "lessThan": 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zone,\nand one to the thermal zone registration error path to cover failures\npreceding the thermal zone device registration."}], "id": "CVE-2026-46021", "lastModified": "2026-11-10T13:19:13.840", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46021", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:05:28.766453Z", "version": "2.0.3"}}]}, "published": "2026-05-27T14:17:20.567", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37a430a2d4e66ec8238da6c7f7e48809bf265e13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41ff66baf81c6541f4f985dd7eac4494d03d9440"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64d4ebf91d082034bbc5ae3ba2d7fd800bc02d06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/75f8f3c3e09122270986de9d7aa347d701676761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8e563d8db50f303171aceb79eec0807e7ba06951"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a172fa18bc370b776ac1510abb0dcb50a7a35fac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4eb861adde5ce22e459fbd29366f47bb2167977"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f412e541d25a3dfaf3d53e012ade6ff03cae8a45"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: thermal: core: Fix thermal zone governor cleanup issues", "id": "2482118", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482118"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's thermal management subsystem. This vulnerability can lead to a memory leak if a thermal governor is not correctly cleaned up during device registration failures. More critically, a race condition during thermal zone unregistration, where a governor update might conflict with the unregistration process, can result in a use-after-free error. A local attacker could potentially exploit this use-after-free to cause system instability, leading to a denial of service, or in some scenarios, achieve unauthorized code execution."], "name": "CVE-2026-46021", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46021\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46021\nhttps://lore.kernel.org/linux-cve-announce/2026052746-CVE-2026-46021-095e@gregkh/T"], "threat_severity": "Moderate"}

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