CVE-2023-52837

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UAF may be triggered in nbd_open()\nif someone tries to open nbd device right after nbd_put() since nbd has\nbeen free in nbd_dev_remove().\n\nFix this by implementing ->free_disk and free private data in it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached by opening the local NBD block device node (/dev/nbdX) via the normal block open path into nbd_open; the kernel NBD code is a client and this UAF is not triggered by remote packet processing.\nAC:L - The attacker can drive both sides of the teardown-vs-open race (e.g., close triggering destroy with DESTROY_ON_DISCONNECT/DISCONNECT_ON_CLOSE while concurrently opening), so success does not depend on conditions outside attacker control.\nPR:L - nbd_open has no capability check and is reachable to a local user who can open the NBD device node; while creating/configuring NBD needs CAP_SYS_ADMIN in the init namespace, exploitation of an existing destroy-on-disconnect device does not require full admin rights.\nUI:N - The attacker triggers the vulnerability directly by opening/closing the NBD device; no separate victim action is required.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same OS security authority, with no VM escape or other cross-boundary impact.\nC:H - Use-after-free of the nbd_device object allows reclaim and reuse of the freed object, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF can be turned into heap spray and control-flow hijacking primitives, enabling arbitrary kernel writes or code execution.\nA:H - Dereferencing the freed nbd_device in nbd_open can cause kernel oops/panic even without full exploitation, so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/nbd.c"], "versions": [{"version": "4af5f2e0301311f88c420fcfc5f3c8611ade20ac", "lessThan": "4e9b3ec84dc97909876641dad14e0a2300d6c2a3", "status": "affected", "versionType": "git"}, {"version": "4af5f2e0301311f88c420fcfc5f3c8611ade20ac", "lessThan": "879947f4180bc6e83af64eb0515e0cf57fce15db", "status": "affected", "versionType": "git"}, {"version": "4af5f2e0301311f88c420fcfc5f3c8611ade20ac", "lessThan": "56bd7901b5e9dbc9112036ea615ebcba1565fafe", "status": "affected", "versionType": "git"}, {"version": "4af5f2e0301311f88c420fcfc5f3c8611ade20ac", "lessThan": "327462725b0f759f093788dfbcb2f1fd132f956b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/nbd.c"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.63", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5.12", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.2", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.7", "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": "5.14", "versionEndExcluding": "6.1.63"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.5.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.7"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3"}, {"url": "https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db"}, {"url": "https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe"}, {"url": "https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b"}], "title": "nbd: fix uaf in nbd_open", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-52837", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-21T18:01:48.631616Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:23:20.566Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:11:36.041Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b", "tags": ["x_transferred"]}]}]}}

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UAF may be triggered in nbd_open()\nif someone tries to open nbd device right after nbd_put() since nbd has\nbeen free in nbd_dev_remove().\n\nFix this by implementing ->free_disk and free private data in it."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: nbd: corrija uaf en nbd_open Commit 4af5f2e03013 (\"nbd: use blk_mq_alloc_disk y blk_cleanup_disk\") limpia el disco mediante blk_cleanup_disk() y no configurar\u00e1 disk->private_data como NULL como antes. UAF puede activarse en nbd_open() si alguien intenta abrir el dispositivo nbd justo despu\u00e9s de nbd_put() ya que nbd ha estado libre en nbd_dev_remove(). Solucione este problema implementando ->free_disk y datos privados gratuitos en \u00e9l."}], "id": "CVE-2023-52837", "lastModified": "2026-08-04T10:18:45.457", "metrics": {"cvssMetricV31": [{"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": "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-52837", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-21T18:01:48.631616Z", "version": "2.0.3"}}]}, "published": "2024-05-21T16:15:21.170", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: nbd: fix uaf in nbd_open", "id": "2282637", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282637"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnbd: fix uaf in nbd_open\nCommit 4af5f2e03013 (\"nbd: use blk_mq_alloc_disk and\nblk_cleanup_disk\") cleans up disk by blk_cleanup_disk() and it won't set\ndisk->private_data as NULL as before. UAF may be triggered in nbd_open()\nif someone tries to open nbd device right after nbd_put() since nbd has\nbeen free in nbd_dev_remove().\nFix this by implementing ->free_disk and free private data in it."], "name": "CVE-2023-52837", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52837\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52837\nhttps://lore.kernel.org/linux-cve-announce/2024052110-CVE-2023-52837-6490@gregkh/T"], "threat_severity": "Low"}

{}