CVE-2025-37952

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This prevents two threads acquiring the\nsame file pointer via __close_file_table_ids, as well as the other\nfunctions which retrieve a file from the IDR and which already use\nthis same lock."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server; the entire path is driven by SMB2 PDUs (TREE_DISCONNECT, LOGOFF, CLOSE) arriving on TCP/445 from a remote peer. No local access is involved at any point.\nAC:L - The attacker controls both sides of the race \u2014 each SMB2 request is dispatched to the concurrent \"ksmbd-io\" workqueue, so pipelining CLOSE alongside TREE_DISCONNECT/LOGOFF on one connection (or using multichannel connections sharing one file table) reliably produces overlapping execution. The unlocked IDR walk gives a wide window, and the race can be retried indefinitely.\nPR:L - The attacker must complete SMB2 SESSION_SETUP, TREE_CONNECT and open at least one file so the session file table is populated, which needs valid (low-privilege) share credentials in a default configuration. Any ordinary share user qualifies, and on guest-mapped public shares even that requirement disappears.\nUI:N - The attacker drives the entire sequence from their own SMB connection; no action by a local user or administrator is needed.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; there is no VM, IOMMU or sandbox boundary crossed.\nC:H - The freed ksmbd_file is dereferenced for fp->tcon, fp->f_ci and the fp->blocked_works list, and the attacker can reallocate the slab object via SMB2_CREATE to control those contents, turning the UAF into an arbitrary kernel-memory read primitive.\nI:H - set_close_state_blocked_works() performs `cancel_work->state = KSMBD_WORK_CLOSED` and then an indirect call `cancel_work->cancel_fn(cancel_work->cancel_argv)` using pointers read out of freed memory, and __ksmbd_close_fd() fput()s a stale struct file and double-frees the object \u2014 giving write-what-where and control-flow hijack primitives.\nA:H - Even unexploited, the double refcount decrement and double kmem_cache_free/fput corrupt the slab allocator and file refcounts, causing an immediate oops or panic that takes down the whole server."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/vfs_cache.c"], "versions": [{"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "21100812657965dd95bc305f6076f62012f34cf4", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "fec1f9e9a650e8e7011330a085c77e7bf2a08ea9", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "9e9841e232b51171ddf3bc4ee517d5d28dc8cad6", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "16727e442568a46d9cca69fe2595896de86e120d", "status": "affected", "versionType": "git"}, {"version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "36991c1ccde2d5a521577c448ffe07fcccfe104d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/server/vfs_cache.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.91", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.29", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.7", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "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", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.29"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/21100812657965dd95bc305f6076f62012f34cf4"}, {"url": "https://git.kernel.org/stable/c/fec1f9e9a650e8e7011330a085c77e7bf2a08ea9"}, {"url": "https://git.kernel.org/stable/c/9e9841e232b51171ddf3bc4ee517d5d28dc8cad6"}, {"url": "https://git.kernel.org/stable/c/16727e442568a46d9cca69fe2595896de86e120d"}, {"url": "https://git.kernel.org/stable/c/36991c1ccde2d5a521577c448ffe07fcccfe104d"}], "title": "ksmbd: Fix UAF in __close_file_table_ids", "x_generator": {"engine": "bippy-1.2.0"}}}}

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The existing checks on fp->refcount are not sufficient to\nprevent this.\n\nThe fix takes ft->lock around the section which removes the\nfile from the file table. This prevents two threads acquiring the\nsame file pointer via __close_file_table_ids, as well as the other\nfunctions which retrieve a file from the IDR and which already use\nthis same lock."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: Correcci\u00f3n de UAF en __close_file_table_ids. Es posible un use-after-free si un hilo destruye el archivo mediante __ksmbd_close_fd mientras otro hilo mantiene una referencia a \u00e9l. Las comprobaciones existentes en fp->refcount no son suficientes para evitarlo. La correcci\u00f3n aplica ft->lock a la secci\u00f3n que elimina el archivo de la tabla de archivos. Esto impide que dos hilos adquieran el mismo puntero de archivo mediante __close_file_table_ids, as\u00ed como otras funciones que recuperan un archivo del IDR y que ya utilizan este mismo bloqueo."}], "id": "CVE-2025-37952", "lastModified": "2026-10-30T13:17:58.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-20T16:15:33.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16727e442568a46d9cca69fe2595896de86e120d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/21100812657965dd95bc305f6076f62012f34cf4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36991c1ccde2d5a521577c448ffe07fcccfe104d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e9841e232b51171ddf3bc4ee517d5d28dc8cad6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fec1f9e9a650e8e7011330a085c77e7bf2a08ea9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: Fix UAF in __close_file_table_ids", "id": "2367574", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367574"}, "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 UAF in __close_file_table_ids\nA use-after-free is possible if one thread destroys the file\nvia __ksmbd_close_fd while another thread holds a reference to\nit. The existing checks on fp->refcount are not sufficient to\nprevent this.\nThe fix takes ft->lock around the section which removes the\nfile from the file table. This prevents two threads acquiring the\nsame file pointer via __close_file_table_ids, as well as the other\nfunctions which retrieve a file from the IDR and which already use\nthis same lock."], "name": "CVE-2025-37952", "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": "2025-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37952\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37952\nhttps://lore.kernel.org/linux-cve-announce/2025052001-CVE-2025-37952-299d@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-06-24T09:44:23.752259+00:00", "updated": "2025-06-24T09:44:23.752344+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}