CVE-2026-46243

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46243", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.107Z", "datePublished": "2026-06-01T16:22:29.211Z", "dateUpdated": "2026-10-15T01:21:23.530Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:42.627Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."}], "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:N", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local `request_key(2)` or `add_key(2)` from an unprivileged process; the flaw is missing origin validation in the keyring path, not remote SMB/CIFS protocol input.\nAC:L - On typical affected systems (CIFS module with upcall, cifs-utils request-key rule, unprivileged user/mount namespaces), the attacker fully controls the forged description, target pid, and namespace layout for a reliable root upcall chain.\nPR:L - Any local unprivileged user account can invoke the key syscalls; user/mount namespaces are part of the standard exploit setup and map to basic local user capability, not root-only access.\nUI:N - No victim action such as mounting a Kerberos CIFS share is required; the attacker forges the key request directly without depending on another user\u2019s mount or session.\nS:U - Successful exploitation elevates privileges within the same host/kernel security domain (local root) and does not cross a VM/hypervisor or hardware isolation boundary by itself.\nC:H - The attack chain yields root-equivalent access in the root upcall helper, enabling arbitrary read of host data (full confidentiality compromise of the system).\nI:H - Malicious NSS modules run as root inside `cifs.upcall`, giving arbitrary code execution and full integrity compromise of the host, not merely limited data modification.\nA:N - The kernel bug is a trust-boundary failure without memory corruption or guaranteed kernel panic; primary impact is privilege escalation rather than kernel crash or sustained denial of service."}]}], 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This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-825", "description": "Expired Pointer Dereference"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-01T12:04:59.876Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-46243", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-06-01T17:52:03.133770Z"}}}], "references": [{"url": "https://github.com/manizada/CIFSwitch", "tags": ["exploit"]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-01T17:50:56.636Z"}}], "cna": {"title": "smb: client: reject userspace cifs.spnego descriptions", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local `request_key(2)` or `add_key(2)` from an unprivileged process; the flaw is missing origin validation in the keyring path, not remote SMB/CIFS protocol input.\nAC:L - On typical affected systems (CIFS module with upcall, cifs-utils request-key rule, unprivileged user/mount namespaces), the attacker fully controls the forged description, target pid, and namespace layout for a reliable root upcall chain.\nPR:L - Any local unprivileged user account can invoke the key syscalls; user/mount namespaces are part of the standard exploit setup and map to basic local user capability, not root-only access.\nUI:N - No victim action such as mounting a Kerberos CIFS share is required; the attacker forges the key request directly without depending on another user\u2019s mount or session.\nS:U - Successful exploitation elevates privileges within the same host/kernel security domain (local root) and does not cross a VM/hypervisor or hardware isolation boundary by itself.\nC:H - The attack chain yields root-equivalent access in the root upcall helper, enabling arbitrary read of host data (full confidentiality compromise of the system).\nI:H - Malicious NSS modules run as root inside `cifs.upcall`, giving arbitrary code execution and full integrity compromise of the host, not merely limited data modification.\nA:N - The kernel bug is a trust-boundary failure without memory corruption or guaranteed kernel panic; primary impact is privilege escalation rather than kernel crash or sustained denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "7713bd320ed4fc3d08a227cd8e41242219a16981", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "9544559e59438a4b609b2fdfa0763d8360572824", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "cf20038657d6d4974349556a34e08fe0490bebbc", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "2035acfb17221729b1b8ac335e941868a04ca079", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "a3bbda6502a9398b816fa2e71c9a3f955f58013d", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "91f89c1d83e80417629791fcef6af8140d7d01c8", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "0aece6685fc80a8de492688ca2315fb86ec379c7", "versionType": "git"}, {"status": "affected", "version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435", "lessThan": "3da1fdf4efbc490041eb4f836bf596201203f8f2", "versionType": "git"}], "programFiles": ["fs/smb/client/cifs_spnego.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.24"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.24", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/cifs_spnego.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981"}, {"url": "https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824"}, {"url": "https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc"}, {"url": "https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079"}, {"url": "https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d"}, {"url": "https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8"}, {"url": "https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7"}, {"url": "https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.142", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.92", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.34", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.11", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "2.6.24"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:42.627Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46243", "state": "PUBLISHED", "dateUpdated": "2026-09-01T12:04:59.876Z", "dateReserved": "2026-05-13T15:03:33.107Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-01T16:22:29.211Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: rechazar descripciones de cifs.spnego del espacio de usuario\n\nLas descripciones de claves de cifs.spnego contienen campos que confieren autoridad, como pid, uid, creduid y upcall_target, que cifs.upcall trata como entradas con origen en el kernel. Sin embargo, el espacio de usuario tambi\u00e9n puede crear claves de este tipo a trav\u00e9s de request_key(2) o add_key(2), permitiendo que esos campos sean proporcionados sin origen CIFS.\n\nSolo aceptar descripciones de cifs.spnego mientras CIFS est\u00e9 usando su spnego_cred privado para solicitar la clave."}], "id": "CVE-2026-46243", "lastModified": "2026-10-15T02:19:51.103", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.1, "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:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", 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{"bugzilla": {"description": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions", "id": "2481486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481486"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges."], "mitigation": {"lang": "en:us", "value": "See the security bulletin for a detailed mitigation procedure."}, "name": "CVE-2026-46243", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "impact": "low", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46243\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46243\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2\nhttps://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/"], "threat_severity": "Important"}

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