CVE-2023-53597

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-53597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-04T15:40:38.479Z", "datePublished": "2025-10-04T15:44:09.616Z", "dateUpdated": "2026-08-05T09:15:00.757Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:00.757Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix mid leak during reconnection after timeout threshold\n\nWhen the number of responses with status of STATUS_IO_TIMEOUT\nexceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect\nthe connection. But we do not return the mid, or the credits\nreturned for the mid, or reduce the number of in-flight requests.\n\nThis bug could result in the server->in_flight count to go bad,\nand also cause a leak in the mids.\n\nThis change moves the check to a few lines below where the\nresponse is decrypted, even of the response is read from the\ntransform header. This way, the code for returning the mids\ncan be reused.\n\nAlso, the cifs_reconnect was reconnecting just the transport\nconnection before. In case of multi-channel, this may not be\nwhat we want to do after several timeouts. Changed that to\nreconnect the session and the tree too.\n\nAlso renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name\nMAX_STATUS_IO_TIMEOUT."}], "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 - The vulnerable code is the CIFS/SMB client demultiplex thread parsing responses received from a remote SMB server over TCP; a malicious, compromised, or MITM-positioned server triggers it purely by the status field it puts in its replies. No local access to the victim is needed.\nAC:L - The server simply returns STATUS_IO_TIMEOUT to six consecutive requests, which deterministically drives the `num_io_timeout > NUM_STATUS_IO_TIMEOUT` path; there is no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:N - The attacker is the remote peer (or an on-path attacker on an unsigned connection) and holds no privileges whatsoever on the victim client system. Response status codes are attacker-chosen with no authorization gate on the client side.\nUI:N - Exploitation happens on an already-established mount by replying to requests the client issues on its own (writeback, echo, reads), and the client auto-reconnects after each reconnect cycle, so no victim action is required at exploit time.\nS:U - The leaked mids, credits, and stalled I/O are all confined to the kernel of the client host running the cifs module; no security boundary such as a VM or IOMMU domain is crossed.\nC:N - This is a reference/resource leak \u2014 an object is over-referenced and never freed. There is no out-of-bounds read, use-after-free, or uninitialized data path, so no information is disclosed to the attacker.\nI:N - No memory is corrupted and no attacker-controlled write occurs; stalled writes leave pages permanently under writeback rather than silently reporting success, so no data is modified or falsified.\nA:H - The bug is repeatable without limit, producing an unbounded kernel memory leak plus permanent `server->in_flight` inflation and credit loss that makes `wait_for_free_credits()` block indefinitely, and skipped read/write callbacks leave pages locked or under writeback forever \u2014 yielding unkillable D-state tasks, a hung/unmountable filesystem, and eventual OOM."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/connect.c"], "versions": [{"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "lessThan": "df31d05f0678cdd0796ea19983a2b93edca18bb0", "status": "affected", "versionType": "git"}, {"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "lessThan": "c55901d381a22300c9922170e59704059f50977b", "status": "affected", "versionType": "git"}, {"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "lessThan": "57d25e9905c71133e201f6d06b56a3403d4ad433", "status": "affected", "versionType": "git"}, {"version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "lessThan": "69cba9d3c1284e0838ae408830a02c4a063104bc", "status": "affected", "versionType": "git"}, {"version": "fa6d7a5853f93efb088aba36af12cb1944156411", "status": "affected", "versionType": "git"}, {"version": "5.9.5", "lessThan": "5.10", "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/client/connect.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.150", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.42", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.7", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5", "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": "5.10", "versionEndExcluding": "5.15.150"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.4.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/df31d05f0678cdd0796ea19983a2b93edca18bb0"}, {"url": "https://git.kernel.org/stable/c/c55901d381a22300c9922170e59704059f50977b"}, {"url": "https://git.kernel.org/stable/c/57d25e9905c71133e201f6d06b56a3403d4ad433"}, {"url": "https://git.kernel.org/stable/c/69cba9d3c1284e0838ae408830a02c4a063104bc"}], "title": "cifs: fix mid leak during reconnection after timeout threshold", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/connect.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "df31d05f0678cdd0796ea19983a2b93edca18bb0", "status": "affected", "version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "versionType": "git"}, {"lessThan": "c55901d381a22300c9922170e59704059f50977b", "status": "affected", "version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "versionType": "git"}, {"lessThan": "57d25e9905c71133e201f6d06b56a3403d4ad433", "status": "affected", "version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "versionType": "git"}, {"lessThan": "69cba9d3c1284e0838ae408830a02c4a063104bc", "status": "affected", "version": "8e670f77c4a55013db6d23b962f9bf6673a5e7b6", "versionType": "git"}, {"status": "affected", "version": "fa6d7a5853f93efb088aba36af12cb1944156411", "versionType": "git"}, {"lessThan": "5.10", "status": "affected", "version": "5.9.5", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/connect.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.150", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.42", "versionType": "semver"}, {"lessThanOrEqual": "6.4.*", "status": "unaffected", "version": "6.4.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.5", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B2D56558-DCDD-4670-9433-8C92DAD277A8", "versionEndExcluding": "5.15.150", "versionStartIncluding": "5.9.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6E769E6A-7EEF-4FA8-BF41-6CA1CE537361", "versionEndExcluding": "6.1.42", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "60A1A1ED-EA6C-42F6-80D3-3316DC7608C7", "versionEndExcluding": "6.4.7", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*", "matchCriteriaId": "0B3E6E4D-E24E-4630-B00C-8C9901C597B0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix mid leak during reconnection after timeout threshold\n\nWhen the number of responses with status of STATUS_IO_TIMEOUT\nexceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect\nthe connection. But we do not return the mid, or the credits\nreturned for the mid, or reduce the number of in-flight requests.\n\nThis bug could result in the server->in_flight count to go bad,\nand also cause a leak in the mids.\n\nThis change moves the check to a few lines below where the\nresponse is decrypted, even of the response is read from the\ntransform header. This way, the code for returning the mids\ncan be reused.\n\nAlso, the cifs_reconnect was reconnecting just the transport\nconnection before. In case of multi-channel, this may not be\nwhat we want to do after several timeouts. Changed that to\nreconnect the session and the tree too.\n\nAlso renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name\nMAX_STATUS_IO_TIMEOUT."}], "id": "CVE-2023-53597", "lastModified": "2026-08-04T10:19:13.703", "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": "2025-10-04T16:15:56.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57d25e9905c71133e201f6d06b56a3403d4ad433"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/69cba9d3c1284e0838ae408830a02c4a063104bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c55901d381a22300c9922170e59704059f50977b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df31d05f0678cdd0796ea19983a2b93edca18bb0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cifs: fix mid leak during reconnection after timeout threshold", "id": "2401466", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2401466"}, "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:\ncifs: fix mid leak during reconnection after timeout threshold\nWhen the number of responses with status of STATUS_IO_TIMEOUT\nexceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect\nthe connection. But we do not return the mid, or the credits\nreturned for the mid, or reduce the number of in-flight requests.\nThis bug could result in the server->in_flight count to go bad,\nand also cause a leak in the mids.\nThis change moves the check to a few lines below where the\nresponse is decrypted, even of the response is read from the\ntransform header. This way, the code for returning the mids\ncan be reused.\nAlso, the cifs_reconnect was reconnecting just the transport\nconnection before. In case of multi-channel, this may not be\nwhat we want to do after several timeouts. Changed that to\nreconnect the session and the tree too.\nAlso renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name\nMAX_STATUS_IO_TIMEOUT."], "name": "CVE-2023-53597", "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": "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-2023-53597\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53597\nhttps://lore.kernel.org/linux-cve-announce/2025100429-CVE-2023-53597-e30c@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-10-06T14:41:20.186589+00:00", "updated": "2025-10-06T14:41:20.186653+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}