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{"bugzilla": {"description": "kernel: ksmbd: fix use-after-free in ksmbd_sessions_deregister()", "id": "2360294", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360294"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: fix use-after-free in ksmbd_sessions_deregister()\nIn multichannel mode, UAF issue can occur in session_deregister\nwhen the second channel sets up a session through the connection of\nthe first channel. session that is freed through the global session\ntable can be accessed again through ->sessions of connection."], "name": "CVE-2025-22041", "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": "2025-04-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-22041\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-22041\nhttps://lore.kernel.org/linux-cve-announce/2025041600-CVE-2025-22041-6dbd@gregkh/T"], "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-28T02:18:05.456733+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a version that contains the ksmbd use\u2011after\u2011free fix; the patch is available in mainline kernel commits.", "If SMB server functionality is not required, disable the ksmbd module (e.g., by omitting it from the kernel config or setting 'ksmbd=off' on boot).", "If an immediate kernel upgrade is not possible, restrict SMB traffic to trusted IP addresses and monitor for abnormal session activity."], "summary": {"action": "Apply Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "All Linux kernels that include the ksmbd SMB server component are potentially affected. The specific release numbers are not listed in the data, but a patch commit is referenced in the kernel git log and a Debian LTS announcement indicates they will be patched in upcoming releases.", "description_and_impact": "The vulnerability is a use\u2011after\u2011free in ksmbd_sessions_deregister() that can be triggered when a second SMB channel sets up a session while the first channel is still active. The freed session in the global session table can still be accessed through the connection\u2019s session list, leading to kernel memory corruption. Because the code runs in privileged kernel space, an attacker could potentially craft SMB traffic to drive corrupted data into executable paths, allowing arbitrary code execution or a denial\u2011of\u2011service by crashing the kernel. The flaw is categorized as CWE\u2011416.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high impact, but the EPSS score of <1% signals that the likelihood of exploitation in the wild is currently very low. The flaw is not listed as a Known Exploited Vulnerability by CISA, so active exploitation is not confirmed. Attackers would need to reach the PSM server over SMB, either locally on the machine or remotely if the service is exposed, to send crafted requests that exercise the UAF path. No official workaround is supplied by the CNA."}}}}, "created": "2026-04-28T02:30:18.739134+00:00", "updated": "2026-04-28T02:30:18.739146+00:00", "vendors": []}