CVE-2023-52480

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ksmbd_expire_session."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server on TCP/445; the UAF is reached by processing remotely supplied SMB2 SESSION_SETUP and concurrent session-bearing PDUs in ksmbd worker threads, with no local access required.\nAC:L - The attacker controls both sides of the race by sending concurrent requests on the same connection\u2014one path calls unlocked ksmbd_session_lookup while another SESSION_SETUP(SessionId=0) runs ksmbd_session_register\u2192ksmbd_expire_session\u2192kfree\u2014and can retry freely via the ksmbd-io workqueue.\nPR:N - SESSION_SETUP with SessionId=0 creates an SMB2_SESSION_IN_PROGRESS session before any credential check, and expire destroys any non-VALID session; smb2_check_user_session still enters ksmbd_session_lookup and performs the UAF write before the VALID-state filter, so no authentication is required.\nUI:N - Exploitation is driven entirely by the remote attacker\u2019s SMB traffic to ksmbd; no local user or administrator action is needed beyond ksmbd already listening.\nS:U - This is a standard in-kernel use-after-free within the host kernel\u2019s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The race is a use-after-free on struct ksmbd_session; reclaiming the freed object (including forging state==VALID so lookup_all returns a dangling sess) yields a kernel read primitive over session keys, pointers, and adjacent heap.\nI:H - ksmbd_session_lookup performs a write of jiffies into freed session memory, and a reclaimed fake session is then consumed by later SMB command handling\u2014an exploitable UAF write/control-flow hijack primitive in ring 0.\nA:H - Even without full exploitation, the UAF read/write on a kfree\u2019d session crashes ksmbd worker threads (KASAN slab-UAF / oops/panic), and 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the UAF is reached by processing remotely supplied SMB2 SESSION_SETUP and concurrent session-bearing PDUs in ksmbd worker threads, with no local access required.\nAC:L - The attacker controls both sides of the race by sending concurrent requests on the same connection\u2014one path calls unlocked ksmbd_session_lookup while another SESSION_SETUP(SessionId=0) runs ksmbd_session_register\u2192ksmbd_expire_session\u2192kfree\u2014and can retry freely via the ksmbd-io workqueue.\nPR:N - SESSION_SETUP with SessionId=0 creates an SMB2_SESSION_IN_PROGRESS session before any credential check, and expire destroys any non-VALID session; smb2_check_user_session still enters ksmbd_session_lookup and performs the UAF write before the VALID-state filter, so no authentication is required.\nUI:N - Exploitation is driven entirely by the remote attacker\u2019s SMB traffic to ksmbd; no local user or administrator action is needed beyond ksmbd already listening.\nS:U - This is a standard in-kernel use-after-free within the host kernel\u2019s security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The race is a use-after-free on struct ksmbd_session; reclaiming the freed object (including forging state==VALID so lookup_all returns a dangling sess) yields a kernel read primitive over session keys, pointers, and adjacent heap.\nI:H - ksmbd_session_lookup performs a write of jiffies into freed session memory, and a reclaimed fake session is then consumed by later SMB command handling\u2014an exploitable UAF write/control-flow hijack primitive in ring 0.\nA:H - Even without full exploitation, the UAF read/write on a kfree\u2019d session crashes ksmbd worker threads (KASAN slab-UAF / oops/panic), and an unauthenticated attacker can retrigger the race indefinitely."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a6a9601ba995d0fec635324cb9fd8d14f9bea14e", "lessThan": "c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f", "versionType": "git"}, {"status": "affected", "version": "1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d", "lessThan": "a2ca5fd3dbcc665e1169044fa0c9e3eba779202b", "versionType": "git"}, {"status": "affected", "version": "ea174a91893956450510945a0c5d1a10b5323656", "lessThan": "18ced78b0ebccc2d16f426143dc56ab3aad666be", "versionType": "git"}, {"status": "affected", "version": "ea174a91893956450510945a0c5d1a10b5323656", "lessThan": "53ff5cf89142b978b1a5ca8dc4d4425e6a09745f", "versionType": "git"}, {"status": "affected", "version": "750a2d772e9d9ff377fd32e3b6797bf2cd847a7a", "versionType": "git"}, {"status": "affected", "version": "6775ee7ef4b37c521aa4cf3730f54554c4875542", "versionType": "git"}, {"status": "affected", "version": "6.1.29", "lessThan": "6.1.57", "versionType": "semver"}, {"status": "affected", "version": "6.2.16", "lessThan": "6.3", "versionType": "semver"}, {"status": "affected", "version": "6.3.2", "lessThan": "6.4", "versionType": "semver"}], "programFiles": ["fs/smb/server/connection.c", "fs/smb/server/connection.h", "fs/smb/server/mgmt/user_session.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"status": "unaffected", "version": "0", "lessThan": "6.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.57", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.5.7", "versionType": "semver", "lessThanOrEqual": "6.5.*"}, {"status": "unaffected", "version": "6.6", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/connection.c", "fs/smb/server/connection.h", "fs/smb/server/mgmt/user_session.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f"}, {"url": "https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b"}, {"url": "https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be"}, {"url": "https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix race condition between session lookup and expire\n\n Thread A + Thread B\n ksmbd_session_lookup | smb2_sess_setup\n sess = xa_load |\n |\n | xa_erase(&conn->sessions, sess->id);\n |\n | ksmbd_session_destroy(sess) --> kfree(sess)\n |\n // UAF! |\n sess->last_active = jiffies |\n +\n\nThis patch add rwsem to fix race condition between ksmbd_session_lookup\nand ksmbd_expire_session."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.57", "versionStartIncluding": "6.1.29"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5.7", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6", "versionStartIncluding": "6.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.2.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.3.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:23:49.816Z"}}}, "cveMetadata": {"cveId": "CVE-2023-52480", "state": "PUBLISHED", "dateUpdated": "2026-08-15T12:23:49.816Z", "dateReserved": "2024-02-20T12:30:33.300Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-29T05:43:12.019Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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|\n sess->last_active = jiffies |\n +\n\nThis patch add rwsem to fix race condition between ksmbd_session_lookup\nand ksmbd_expire_session."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ksmbd: corrige la condici\u00f3n de ejecuci\u00f3n entre la b\u00fasqueda de sesi\u00f3n y la caducidad del subproceso A + subproceso B ksmbd_session_lookup | smb2_sess_setup sess = xa_load | | | xa_erase(&conn->sesiones, sesi\u00f3n->id); | | ksmbd_session_destroy(sess) --> kfree(sess) | // \u00a1UAF! | sess->last_active = jiffies | + Este parche agrega rwsem para corregir la condici\u00f3n de ejecuci\u00f3n entre ksmbd_session_lookup y ksmbd_expire_session."}], "id": "CVE-2023-52480", "lastModified": "2026-08-15T13:17:43.320", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52480", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:57:23.856280Z", "version": "2.0.3"}}]}, "published": "2024-02-29T06:15:46.017", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix race condition between session lookup and expire", "id": "2267032", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267032"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix race condition between session lookup and expire\nThread A + Thread B\nksmbd_session_lookup | smb2_sess_setup\nsess = xa_load |\n|\n| xa_erase(&conn->sessions, sess->id);\n|\n| ksmbd_session_destroy(sess) --> kfree(sess)\n|\n// UAF! |\nsess->last_active = jiffies |\n+\nThis patch add rwsem to fix race condition between ksmbd_session_lookup\nand ksmbd_expire_session.", "A flaw was found in the ksmbd module in the Linux kernel. A race condition between session lookup and expire can cause a use-after-free, resulting in a denial of service."], "name": "CVE-2023-52480", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52480\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52480\nhttps://lore.kernel.org/linux-cve-announce/2024022922-CVE-2023-52480-ff7f@gregkh/T/#u"], "statement": "The ksmbd module is not built in the kernel shipped in Red Hat Enterprise Linux, so it is not affected by this vulnerability.", "threat_severity": "Moderate"}

{}