CVE-2023-53358

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smb2_tree_disconnect() is invoked from handle_ksmbd_work() solely on SMB2_TREE_DISCONNECT PDUs from a remote peer, with no local access required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2_TREE_DISCONNECT requests for the same TreeId (parallel ksmbd-io workqueue items via SMB credits) and can retry indefinitely until both paths observe the same tcon before TREE_CONN_EXPIRE exists.\nPR:L - smb2_check_user_session() and smb2_get_ksmbd_tcon() gate TREE_DISCONNECT behind an established session and tree connect, so a low-privileged SMB share user (including guest where mapped) is required; this is post-authentication, not a pre-auth path.\nUI:N - The attacker performs negotiate, session setup, tree connect, and concurrent tree disconnects entirely on its own connections; no victim or administrator action is needed.\nS:U - The use-after-free corrupts ksmbd kernel heap state within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Concurrent disconnect double-frees struct ksmbd_tree_connect (share_conf/user pointers), a sprayable slab UAF that yields arbitrary kernel read primitives once the object is reclaimed, consistent with ZDI-CAN-20592 RCE classification.\nI:H - The second disconnect path reads tree_conn fields from freed memory then kfree()s again, enabling heap spray to hijack control flow / arbitrary write; 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{"bugzilla": {"description": "kernel: ksmbd: fix racy issue under cocurrent smb2 tree disconnect", "id": "2396160", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396160"}, "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": ["No description is available for this CVE."], "name": "CVE-2023-53358", "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": "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": "2025-09-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53358\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53358\nhttps://lore.kernel.org/linux-cve-announce/2025091721-CVE-2023-53358-29d3@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-18T11:59:15.088151+00:00", "updated": "2025-09-18T11:59:15.088205+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}