CVE-2023-53794

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A malicious/compromised file server or an on-path attacker triggers it purely over TCP/445 with no local access.\nAC:L - The attacker controls both sides of the race: it stalls the SMB2_LOGOFF response to hold the session in SES_EXITING on smb_ses_list for the full response timeout, while forcing smb2_reconnect_server() to run on demand and repeatedly (it also self-requeues every 2 seconds), making the window trivially wide and the hit near-certain.\nPR:N - No credentials or privileges on the victim system are required \u2014 the attacker is the remote server (or an on-path attacker) acting against an existing mount, and the triggering conditions are protocol-level responses that require no authenticated privilege on the client.\nUI:N - Against an already-established mount (fstab, autofs, systemd automount, container share) the attack proceeds with no victim action; the session teardown side is generated by normal client activity such as DFS referral handling and session churn that the attacker itself induces.\nS:U - The freed and reused objects (struct cifs_ses, struct cifs_tcon) and the resulting corruption all live within the kernel's own security authority, with no crossing into a hypervisor, IOMMU, or other security scope.\nC:H - A use-after-free on a heap-allocated cifs_ses/cifs_tcon lets the attacker groom the freed slab and have the reconnect path read session fields (Suid, auth_key.response, chans[], dfs_root_ses) out of attacker-influenced memory, yielding a kernel information-disclosure primitive.\nI:H - The worker writes into the freed objects \u2014 list_add_tail() stores two pointers into ses->rlist and the freed tcon_ipc->rlist, ses_count is incremented through a dangling dfs_root_ses pointer, and cifs_setup_session() writes ses_status/Suid and frees ses->auth_key.response \u2014 giving write and controlled-free primitives usable for control-flow hijack.\nA:H - The use-after-free reliably corrupts kernel memory, taking spinlocks and mutexes inside a freed allocation and corrupting list heads, which oopses or panics the machine and can hang the cifs workqueue."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2pdu.c"], "versions": [{"version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "lessThan": "7e4f5c3f01fb0e51ca438e43262d858daf9a0a76", "status": "affected", "versionType": "git"}, {"version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "lessThan": "759ffc164d95a32c09528766d74d9b4fb054e8f4", "status": "affected", "versionType": "git"}, {"version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "lessThan": "99f280700b4cc02d5f141b8d15f8e9fad0418f65", "status": "affected", "versionType": "git"}, {"version": "655e0c067f0e02ece03fd0591dabe3db2ae27552", "status": "affected", "versionType": "git"}, {"version": "875cc09c0767a4ac06b57af383709657f98b3ea1", "status": "affected", "versionType": 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A malicious/compromised file server or an on-path attacker triggers it purely over TCP/445 with no local access.\nAC:L - The attacker controls both sides of the race: it stalls the SMB2_LOGOFF response to hold the session in SES_EXITING on smb_ses_list for the full response timeout, while forcing smb2_reconnect_server() to run on demand and repeatedly (it also self-requeues every 2 seconds), making the window trivially wide and the hit near-certain.\nPR:N - No credentials or privileges on the victim system are required \u2014 the attacker is the remote server (or an on-path attacker) acting against an existing mount, and the triggering conditions are protocol-level responses that require no authenticated privilege on the client.\nUI:N - Against an already-established mount (fstab, autofs, systemd automount, container share) the attack proceeds with no victim action; the session teardown side is generated by normal client activity such as DFS referral handling and session churn that the attacker itself induces.\nS:U - The freed and reused objects (struct cifs_ses, struct cifs_tcon) and the resulting corruption all live within the kernel's own security authority, with no crossing into a hypervisor, IOMMU, or other security scope.\nC:H - A use-after-free on a heap-allocated cifs_ses/cifs_tcon lets the attacker groom the freed slab and have the reconnect path read session fields (Suid, auth_key.response, chans[], dfs_root_ses) out of attacker-influenced memory, yielding a kernel information-disclosure primitive.\nI:H - The worker writes into the freed objects \u2014 list_add_tail() stores two pointers into ses->rlist and the freed tcon_ipc->rlist, ses_count is incremented through a dangling dfs_root_ses pointer, and cifs_setup_session() writes ses_status/Suid and frees ses->auth_key.response \u2014 giving write and controlled-free primitives usable for control-flow hijack.\nA:H - The use-after-free reliably corrupts kernel memory, taking spinlocks and mutexes inside a 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7e4f5c3f01fb0e51ca438e43262d858daf9a0a76", "status": "affected", "version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "versionType": "git"}, {"lessThan": "759ffc164d95a32c09528766d74d9b4fb054e8f4", "status": "affected", "version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "versionType": "git"}, {"lessThan": "99f280700b4cc02d5f141b8d15f8e9fad0418f65", "status": "affected", "version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93", "versionType": "git"}, {"status": "affected", "version": "655e0c067f0e02ece03fd0591dabe3db2ae27552", "versionType": "git"}, {"status": "affected", "version": "875cc09c0767a4ac06b57af383709657f98b3ea1", "versionType": "git"}, {"status": "affected", "version": "599fe1409085059ba12a2c3897c853be9fa9e7cf", "versionType": "git"}, {"status": "affected", "version": "2e4378ee60049b752c9dce16f62ce6fbd11b379a", "versionType": "git"}, {"status": "affected", "version": "59b520454b323ec43b2ae757217332cea33091e0", "versionType": "git"}, {"status": "affected", "version": "e20c888e2b3576e5f498c167729d274ef60b86f8", "versionType": "git"}, {"status": "affected", "version": "4ce7aa4e44d88ce64ea8ae2337b8910f3670b0ba", "versionType": "git"}, {"status": "affected", "version": "419fad68e4c4135ff9859e9214dd6cf954413ca1", "versionType": "git"}, {"lessThan": "3.11", "status": "affected", "version": "3.10.103", "versionType": "semver"}, {"lessThan": "3.13", "status": "affected", "version": "3.12.63", "versionType": "semver"}, {"lessThan": "3.15", "status": "affected", "version": "3.14.74", "versionType": "semver"}, {"lessThan": "3.17", "status": "affected", "version": "3.16.37", "versionType": "semver"}, {"lessThan": "3.19", "status": "affected", "version": "3.18.37", "versionType": "semver"}, {"lessThan": "4.2", "status": "affected", "version": "4.1.28", "versionType": "semver"}, {"lessThan": "4.5", "status": "affected", "version": "4.4.16", "versionType": "semver"}, {"lessThan": "4.7", "status": "affected", "version": "4.6.5", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.7"}, {"lessThan": "4.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.47", "versionType": "semver"}, {"lessThanOrEqual": "6.4.*", "status": "unaffected", "version": "6.4.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.5", "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\ncifs: fix session state check in reconnect to avoid use-after-free issue\n\nDon't collect exiting session in smb2_reconnect_server(), because it\nwill be released soon.\n\nNote that the exiting session will stay in server->smb_ses_list until\nit complete the cifs_free_ipc() and logoff() and then delete itself\nfrom the list."}], "id": "CVE-2023-53794", "lastModified": "2026-10-15T22:17:48.877", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53794", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:37:15.568860Z", "version": "2.0.3"}}]}, "published": "2025-12-09T01:16:50.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/759ffc164d95a32c09528766d74d9b4fb054e8f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e4f5c3f01fb0e51ca438e43262d858daf9a0a76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99f280700b4cc02d5f141b8d15f8e9fad0418f65"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: cifs: fix session state check in reconnect to avoid use-after-free issue", "id": "2420290", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2420290"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncifs: fix session state check in reconnect to avoid use-after-free issue\nDon't collect exiting session in smb2_reconnect_server(), because it\nwill be released soon.\nNote that the exiting session will stay in server->smb_ses_list until\nit complete the cifs_free_ipc() and logoff() and then delete itself\nfrom the list."], "name": "CVE-2023-53794", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "2025-12-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53794\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53794\nhttps://lore.kernel.org/linux-cve-announce/2025120941-CVE-2023-53794-8912@gregkh/T"], "threat_severity": "Important"}

{}