CVE-2025-39929

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This matches the network-reachable scoring already applied to other client-side smbdirect flaws (CVE-2025-39932, CVE-2025-39933).\nAC:L - The attacker owns both sides of the timing: it initiates the RDMA disconnect that drives the QP toward the error/teardown states in which `ib_post_recv()` fails, and it can force reconnect cycles indefinitely, retrying until it lands in the window between `RDMA_CM_EVENT_ESTABLISHED` and `smbd_post_recv()`. The reporter hit the condition during ordinary testing, and unlimited retries mean no condition is truly outside attacker influence.\nPR:N - The SMB Direct negotiate exchange sits beneath SMB2 NEGOTIATE and SESSION_SETUP, so no credentials, capability, or account on the client is validated anywhere along the path to `smbd_negotiate()`. The remote peer needs no privileges on the target to reset the transport and drive the failing handshake.\nUI:N - Against an already-mounted SMB Direct share \u2014 persistent deployment state, not victim participation \u2014 the client's demultiplex thread enters `smbd_reconnect()` \u2192 `_smbd_get_connection()` \u2192 `smbd_negotiate()` automatically whenever the peer drops the connection, with no user action at any point.\nS:U - The leaked `smbdirect_recv_io` object and the un-destroyed per-connection kmem_cache are kernel-internal allocations belonging to the same security authority as the faulting code. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The orphaned buffer is never freed and never reused, so there is no use-after-free, no out-of-bounds read, and no stale DMA mapping (`sge.length` is 0 on the DMA-error path and already unmapped on the `ib_post_recv` path). Nothing is disclosed to the remote attacker.\nI:N - No memory is corrupted or overwritten \u2014 the object simply remains allocated with no dangling reference, so the attacker gains no write primitive and no ability to modify kernel or user data.\nA:H - Every occurrence fires a `slab_bug()` splat plus `WARN()` in `kmem_cache_destroy()`, tainting the kernel and panicking outright on `panic_on_warn=1` systems, and leaves the whole per-connection `smbdirect_recv_io_%p` kmem_cache permanently un-destroyed. Because the remote peer can force unlimited reconnect attempts, the unreclaimable slab caches and their pages accumulate without bound toward memory exhaustion."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smbdirect.c"], "versions": [{"version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "5aa69aabcb275a8012265233c7694076ce1d9102", "status": "affected", "versionType": "git"}, {"version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6", "status": "affected", "versionType": "git"}, {"version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "3d7c075c878ac844e33c43e506c2fa27ac7e9689", "status": "affected", "versionType": "git"}, {"version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "e7b7a93879558e77d950f1ff9a6f3daa385b33df", "status": "affected", 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"https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df"}, {"url": "https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4"}, {"url": "https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e"}, {"url": "https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0"}], "title": "smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:08:35.256Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", 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This matches the network-reachable scoring already applied to other client-side smbdirect flaws (CVE-2025-39932, CVE-2025-39933).\nAC:L - The attacker owns both sides of the timing: it initiates the RDMA disconnect that drives the QP toward the error/teardown states in which `ib_post_recv()` fails, and it can force reconnect cycles indefinitely, retrying until it lands in the window between `RDMA_CM_EVENT_ESTABLISHED` and `smbd_post_recv()`. The reporter hit the condition during ordinary testing, and unlimited retries mean no condition is truly outside attacker influence.\nPR:N - The SMB Direct negotiate exchange sits beneath SMB2 NEGOTIATE and SESSION_SETUP, so no credentials, capability, or account on the client is validated anywhere along the path to `smbd_negotiate()`. The remote peer needs no privileges on the target to reset the transport and drive the failing handshake.\nUI:N - Against an already-mounted SMB Direct share \u2014 persistent deployment state, not victim participation \u2014 the client's demultiplex thread enters `smbd_reconnect()` \u2192 `_smbd_get_connection()` \u2192 `smbd_negotiate()` automatically whenever the peer drops the connection, with no user action at any point.\nS:U - The leaked `smbdirect_recv_io` object and the un-destroyed per-connection kmem_cache are kernel-internal allocations belonging to the same security authority as the faulting code. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The orphaned buffer is never freed and never reused, so there is no use-after-free, no out-of-bounds read, and no stale DMA mapping (`sge.length` is 0 on the DMA-error path and already unmapped on the `ib_post_recv` path). Nothing is disclosed to the remote attacker.\nI:N - No memory is corrupted or overwritten \u2014 the object simply remains allocated with no dangling reference, so the attacker gains no write primitive and no ability to modify kernel or user data.\nA:H - Every occurrence fires a `slab_bug()` splat plus `WARN()` in `kmem_cache_destroy()`, tainting the kernel and panicking outright on `panic_on_warn=1` systems, and leaves the whole per-connection `smbdirect_recv_io_%p` kmem_cache permanently un-destroyed. Because the remote peer can force unlimited reconnect attempts, the unreclaimable slab caches and their pages accumulate without bound toward memory exhaustion."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "5aa69aabcb275a8012265233c7694076ce1d9102", "versionType": "git"}, {"status": "affected", "version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6", "versionType": "git"}, {"status": "affected", "version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "3d7c075c878ac844e33c43e506c2fa27ac7e9689", "versionType": "git"}, {"status": "affected", "version": "f198186aa9bbd60fae7a2061f4feec614d880299", "lessThan": "e7b7a93879558e77d950f1ff9a6f3daa385b33df", "versionType": "git"}, {"status": "affected", "version": 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"unaffected", "version": "6.1.154", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.108", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.49", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.9", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/client/smbdirect.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/5aa69aabcb275a8012265233c7694076ce1d9102"}, {"url": "https://git.kernel.org/stable/c/aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6"}, {"url": "https://git.kernel.org/stable/c/3d7c075c878ac844e33c43e506c2fa27ac7e9689"}, {"url": "https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df"}, {"url": 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"dateReserved": "2025-04-16T07:20:57.147Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-10-04T07:30:55.153Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CAA033E9-A2C5-4976-A83E-9804D8FB827F", "versionEndExcluding": "6.12.49", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "638DD910-1189-4F5E-98BF-2D436B695112", "versionEndExcluding": "6.16.9", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*", "matchCriteriaId": "5A4516A6-C12E-42A4-8C0E-68AEF3264504", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path\n\nDuring tests of another unrelated patch I was able to trigger this\nerror: Objects remaining on __kmem_cache_shutdown()"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: corrige la fuga de smbdirect_recv_io en la ruta de error de smbd_negotiate()\n\nDurante las pruebas de otro parche no relacionado pude activar este\nerror: Objetos restantes en __kmem_cache_shutdown()"}], "id": "CVE-2025-39929", "lastModified": "2026-10-19T21:10:00.160", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39929", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:54:41.432354Z", "version": "2.0.3"}}]}, "published": "2025-10-04T08:15:44.620", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d7c075c878ac844e33c43e506c2fa27ac7e9689"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5aa69aabcb275a8012265233c7694076ce1d9102"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path", "id": "2401419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401419"}, "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:\nsmb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path\nDuring tests of another unrelated patch I was able to trigger this\nerror: Objects remaining on __kmem_cache_shutdown()"], "name": "CVE-2025-39929", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39929\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39929\nhttps://lore.kernel.org/linux-cve-announce/2025100414-CVE-2025-39929-4308@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-10-06T14:41:56.217647+00:00", "updated": "2025-10-06T14:41:56.217725+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}