CVE-2023-52849

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This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\n\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\n if (cxlds->rcd)\n goto endpoint_reset;\n...\n\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/cxl/core/memdev.c"], "versions": [{"version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "lessThan": "20bd0198bebdd706bd4614b3933ef70d7c19618f", "status": "affected", "versionType": "git"}, {"version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "lessThan": "7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b", "status": "affected", "versionType": "git"}, {"version": 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"5.15.139", "lessThanOrEqual": "5.15.*", "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": "5.15", "versionEndExcluding": "5.15.139"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.63"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", 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This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\n\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\n if (cxlds->rcd)\n goto endpoint_reset;\n...\n\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.139", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.63", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5.12", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.2", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.14.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:34:12.699Z"}}}, "cveMetadata": {"cveId": "CVE-2023-52849", "state": "PUBLISHED", "dateUpdated": "2026-05-11T19:34:12.699Z", "dateReserved": "2024-05-21T15:19:24.255Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:31:45.884Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/cxl/core/memdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "20bd0198bebdd706bd4614b3933ef70d7c19618f", "status": "affected", "version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "versionType": "git"}, {"lessThan": "7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b", "status": "affected", "version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "versionType": "git"}, {"lessThan": "cad22a757029c3a1985c221a2d4a6491ad4035ae", "status": "affected", "version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "versionType": "git"}, {"lessThan": "0ca074f7d788627a4e0b047ca5fbdb5fc567220c", "status": "affected", "version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "versionType": "git"}, {"lessThan": "88d3917f82ed4215a2154432c26de1480a61b209", "status": "affected", "version": "9cc238c7a526dba9ee8c210fa2828886fc65db66", "versionType": "git"}, {"status": "affected", "version": "964a9834492210f48b360baa9e20a9eedf4d08ff", "versionType": "git"}, {"lessThan": "5.15", "status": "affected", "version": "5.14.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/cxl/core/memdev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.139", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.63", "versionType": "semver"}, {"lessThanOrEqual": "6.5.*", "status": "unaffected", "version": "6.5.12", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.7", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "51AD3685-34DF-4F34-9122-4437815CA2D3", "versionEndExcluding": "5.15.139", "versionStartIncluding": "5.14.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "80E1EA7E-2788-466C-9FFB-34AFA1B052F0", "versionEndExcluding": "6.1.63", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "825F64D9-E99F-49AA-8A7B-EF7C2965C5B2", "versionEndExcluding": "6.5.12", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4CBFF885-A4D3-4F21-B6FD-4D770034C048", "versionEndExcluding": "6.6.2", "versionStartIncluding": "6.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mem: Fix shutdown order\n\nIra reports that removing cxl_mock_mem causes a crash with the following\ntrace:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000044\n [..]\n RIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core]\n [..]\n Call Trace:\n <TASK>\n cxl_region_detach+0xe8/0x210 [cxl_core]\n cxl_decoder_kill_region+0x27/0x40 [cxl_core]\n cxld_unregister+0x29/0x40 [cxl_core]\n devres_release_all+0xb8/0x110\n device_unbind_cleanup+0xe/0x70\n device_release_driver_internal+0x1d2/0x210\n bus_remove_device+0xd7/0x150\n device_del+0x155/0x3e0\n device_unregister+0x13/0x60\n devm_release_action+0x4d/0x90\n ? __pfx_unregister_port+0x10/0x10 [cxl_core]\n delete_endpoint+0x121/0x130 [cxl_core]\n devres_release_all+0xb8/0x110\n device_unbind_cleanup+0xe/0x70\n device_release_driver_internal+0x1d2/0x210\n bus_remove_device+0xd7/0x150\n device_del+0x155/0x3e0\n ? lock_release+0x142/0x290\n cdev_device_del+0x15/0x50\n cxl_memdev_unregister+0x54/0x70 [cxl_core]\n\nThis crash is due to the clearing out the cxl_memdev's driver context\n(@cxlds) before the subsystem is done with it. This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\n\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\n if (cxlds->rcd)\n goto endpoint_reset;\n...\n\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: cxl/mem: arreglo del orden de apagado. Ira informa que la eliminaci\u00f3n de cxl_mock_mem causa un bloqueo con el siguiente rastro: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000044 [..] RIP: 0010: cxl_region_decode_reset+0x7f/0x180 [cxl_core] [..] Seguimiento de llamadas: cxl_region_detach+0xe8/0x210 [cxl_core] cxl_decoder_kill_region+0x27/0x40 [cxl_core] cxld_unregister+0x29/0x40 [cxl_core] 0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x150 dispositivo_del+0x155/0x3e0 device_unregister+0x13/0x60 devm_release_action+0x4d/0x90 ? __pfx_unregister_port+0x10/0x10 [cxl_core] delete_endpoint+0x121/0x130 [cxl_core] devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 dispositivo_release_driver_internal+0x1d2/0x210 bus_remove_device+0xd7/0x15 0 dispositivo_del+0x155/0x3e0? lock_release+0x142/0x290 cdev_device_del+0x15/0x50 cxl_memdev_unregister+0x54/0x70 [cxl_core] Este bloqueo se debe a que se borr\u00f3 el contexto del controlador de cxl_memdev (@cxlds) antes de que el subsistema termine con \u00e9l. En \u00faltima instancia, esto se debe a que las regiones de las que este memdev es miembro est\u00e1n siendo derribadas y esperan poder eliminar la referencia a @cxlds, como aqu\u00ed: static int cxl_region_decode_reset(struct cxl_region *cxlr, int count) .. si (cxlds-&gt;rcd) pasa a endpoint_reset; ... Solucionelo manteniendo v\u00e1lido el contexto del controlador hasta que se cancele el registro del dispositivo memdev y, posteriormente, toda la pila de dependencias relacionadas."}], "id": "CVE-2023-52849", "lastModified": "2026-06-17T06:43:43.730", "metrics": {"cvssMetricV31": [{"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-2023-52849", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-10T19:16:24.136793Z", "version": "2.0.3"}}]}, "published": "2024-05-21T16:15:22.023", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ca074f7d788627a4e0b047ca5fbdb5fc567220c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20bd0198bebdd706bd4614b3933ef70d7c19618f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c7371b41a14e86f53e7dbe5baa7b1d3e0ab324b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/88d3917f82ed4215a2154432c26de1480a61b209"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cad22a757029c3a1985c221a2d4a6491ad4035ae"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: cxl/mem: Fix shutdown order", "id": "2282619", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282619"}, "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": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncxl/mem: Fix shutdown order\nIra reports that removing cxl_mock_mem causes a crash with the following\ntrace:\nBUG: kernel NULL pointer dereference, address: 0000000000000044\n[..]\nRIP: 0010:cxl_region_decode_reset+0x7f/0x180 [cxl_core]\n[..]\nCall Trace:\n<TASK>\ncxl_region_detach+0xe8/0x210 [cxl_core]\ncxl_decoder_kill_region+0x27/0x40 [cxl_core]\ncxld_unregister+0x29/0x40 [cxl_core]\ndevres_release_all+0xb8/0x110\ndevice_unbind_cleanup+0xe/0x70\ndevice_release_driver_internal+0x1d2/0x210\nbus_remove_device+0xd7/0x150\ndevice_del+0x155/0x3e0\ndevice_unregister+0x13/0x60\ndevm_release_action+0x4d/0x90\n? __pfx_unregister_port+0x10/0x10 [cxl_core]\ndelete_endpoint+0x121/0x130 [cxl_core]\ndevres_release_all+0xb8/0x110\ndevice_unbind_cleanup+0xe/0x70\ndevice_release_driver_internal+0x1d2/0x210\nbus_remove_device+0xd7/0x150\ndevice_del+0x155/0x3e0\n? lock_release+0x142/0x290\ncdev_device_del+0x15/0x50\ncxl_memdev_unregister+0x54/0x70 [cxl_core]\nThis crash is due to the clearing out the cxl_memdev's driver context\n(@cxlds) before the subsystem is done with it. This is ultimately due to\nthe region(s), that this memdev is a member, being torn down and expecting\nto be able to de-reference @cxlds, like here:\nstatic int cxl_region_decode_reset(struct cxl_region *cxlr, int count)\n...\nif (cxlds->rcd)\ngoto endpoint_reset;\n...\nFix it by keeping the driver context valid until memdev-device\nunregistration, and subsequently the entire stack of related\ndependencies, unwinds."], "name": "CVE-2023-52849", "package_state": [{"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": "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"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52849\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52849\nhttps://lore.kernel.org/linux-cve-announce/2024052114-CVE-2023-52849-b63f@gregkh/T"], "threat_severity": "Low"}

{}