CVE-2025-71150

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This patch fixes the issue by explicitly calling\nksmbd_user_session_put to release the reference to the session."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - ksmbd processes attacker-controlled SMB packets over TCP, normally port 445, and the vulnerable lookup is reachable through an SMB3 transform packet.\nAC:L - An attacker controls the complete sequence: negotiate SMB3, create an invalid session, then submit a forged transform header containing its SessionId. No race, encryption key, or external condition is required.\nPR:N - SESSION_SETUP creates and publishes the session before authentication completes, and transform-header processing reaches the lookup before authentication, signing, or cryptographic verification.\nUI:N - Exploitation requires only attacker-generated network traffic and no action by a victim user.\nS:U - The resource leak and resulting denial of service affect the kernel and host managed by the same security authority as the vulnerable SMB server.\nC:N - The flaw retains session objects but does not expose their contents or provide an out-of-bounds read, use-after-free, or other disclosure primitive.\nI:N - The erroneous operation is an increment of the session's own reference count; it does not corrupt adjacent memory or provide an attacker-controlled write or code-execution primitive.\nA:H - An unauthenticated attacker can create unlimited invalid sessions and make each permanently unreclaimable, retaining multiple kernel allocations and session IDs. Repetition can exhaust kernel memory, render ksmbd or the host unavailable, and potentially cause OOM termination or a system crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/mgmt/user_session.c"], "versions": [{"version": "2107ab40629aeabbec369cf34b8cf0f288c3eb1b", "lessThan": "11fe566b442e3bc2774191740fd377739a87a1c0", "status": "affected", "versionType": "git"}, {"version": "37a0e2b362b3150317fb6e2139de67b1e29ae5ff", "lessThan": "0fb87b28cafae71e9c8248432cc3a6a1fd759efc", "status": "affected", "versionType": "git"}, {"version": "450a844c045ff0895d41b05a1cbe8febd1acfcfd", "lessThan": "e54fb2a4772545701766cba08aab20de5eace8cd", "status": "affected", "versionType": "git"}, {"version": "a39e31e22a535d47b14656a7d6a893c7f6cf758c", "lessThan": "02e06785e85b4bd86ef3d23b7c8d87acc76773d5", "status": "affected", "versionType": "git"}, {"version": "b95629435b84b9ecc0c765995204a4d8a913ed52", "lessThan": "8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7", "status": "affected", "versionType": "git"}, {"version": "b95629435b84b9ecc0c765995204a4d8a913ed52", "lessThan": "cafb57f7bdd57abba87725eb4e82bbdca4959644", "status": "affected", "versionType": "git"}, {"version": "5.15.176", "lessThan": "5.15.203", "status": "affected", "versionType": "semver"}, {"version": "6.1.121", "lessThan": "6.1.160", "status": "affected", "versionType": "semver"}, {"version": "6.6.67", "lessThan": "6.6.120", "status": "affected", "versionType": "semver"}, {"version": "6.12.6", "lessThan": "6.12.64", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/mgmt/user_session.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.160", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.3", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.176", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.121", "versionEndExcluding": "6.1.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.67", "versionEndExcluding": "6.6.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.6", "versionEndExcluding": "6.12.64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/11fe566b442e3bc2774191740fd377739a87a1c0"}, {"url": "https://git.kernel.org/stable/c/0fb87b28cafae71e9c8248432cc3a6a1fd759efc"}, {"url": "https://git.kernel.org/stable/c/e54fb2a4772545701766cba08aab20de5eace8cd"}, {"url": "https://git.kernel.org/stable/c/02e06785e85b4bd86ef3d23b7c8d87acc76773d5"}, {"url": "https://git.kernel.org/stable/c/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7"}, {"url": "https://git.kernel.org/stable/c/cafb57f7bdd57abba87725eb4e82bbdca4959644"}], "title": "ksmbd: Fix refcount leak when invalid session is found on session lookup", "x_generator": {"engine": "bippy-1.2.0"}}}}

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a session is found but its state is not SMB2_SESSION_VALID, It\nindicates that no valid session was found, but it is missing to decrement\nthe reference count acquired by the session lookup, which results in\na reference count leak. This patch fixes the issue by explicitly calling\nksmbd_user_session_put to release the reference to the session."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: Soluciona la fuga de contador de referencias cuando se encuentra una sesi\u00f3n inv\u00e1lida en la b\u00fasqueda de sesi\u00f3n\n\nCuando se encuentra una sesi\u00f3n pero su estado no es SMB2_SESSION_VALID, indica que no se encontr\u00f3 ninguna sesi\u00f3n v\u00e1lida, pero falta decrementar el contador de referencias adquirido por la b\u00fasqueda de sesi\u00f3n, lo que resulta en una fuga de contador de referencias. Este parche soluciona el problema llamando expl\u00edcitamente a ksmbd_user_session_put para liberar la referencia a la sesi\u00f3n."}], "id": "CVE-2025-71150", "lastModified": "2026-07-30T06:24:54.640", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-01-23T15:16:05.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02e06785e85b4bd86ef3d23b7c8d87acc76773d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0fb87b28cafae71e9c8248432cc3a6a1fd759efc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/11fe566b442e3bc2774191740fd377739a87a1c0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cafb57f7bdd57abba87725eb4e82bbdca4959644"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e54fb2a4772545701766cba08aab20de5eace8cd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: Fix refcount leak when invalid session is found on session lookup", "id": "2432364", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432364"}, "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-2025-71150", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "2026-01-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-71150\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-71150\nhttps://lore.kernel.org/linux-cve-announce/2026012328-CVE-2025-71150-1b7c@gregkh/T"], "threat_severity": "Low"}

{"created": "2026-04-20T17:30:12.660288+00:00", "updated": "2026-08-05T03:45:03.170398+00:00", "vendors": []}