{"api_version":"1","generated_at":"2026-11-10T11:00:01+00:00","cve":"CVE-2023-53487","urls":{"html":"https://cve.report/CVE-2023-53487","api":"https://cve.report/api/cve/CVE-2023-53487.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-53487","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-53487"},"summary":{"title":"powerpc/rtas_flash: allow user copy to flash block cache objects","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas_flash: allow user copy to flash block cache objects\n\nWith hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the\n/proc/powerpc/rtas/firmware_update interface to prepare a system\nfirmware update yields a BUG():\n\n  kernel BUG at mm/usercopy.c:102!\n  Oops: Exception in kernel mode, sig: 5 [#1]\n  LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\n  Modules linked in:\n  CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2\n  Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries\n  NIP:  c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000\n  REGS: c0000000148c76a0 TRAP: 0700   Not tainted  (6.5.0-rc3+)\n  MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002242  XER: 0000000c\n  CFAR: c0000000001fbd34 IRQMASK: 0\n  [ ... GPRs omitted ... ]\n  NIP usercopy_abort+0xa0/0xb0\n  LR  usercopy_abort+0x9c/0xb0\n  Call Trace:\n    usercopy_abort+0x9c/0xb0 (unreliable)\n    __check_heap_object+0x1b4/0x1d0\n    __check_object_size+0x2d0/0x380\n    rtas_flash_write+0xe4/0x250\n    proc_reg_write+0xfc/0x160\n    vfs_write+0xfc/0x4e0\n    ksys_write+0x90/0x160\n    system_call_exception+0x178/0x320\n    system_call_common+0x160/0x2c4\n\nThe blocks of the firmware image are copied directly from user memory\nto objects allocated from flash_block_cache, so flash_block_cache must\nbe created using kmem_cache_create_usercopy() to mark it safe for user\naccess.\n\n[mpe: Trim and indent oops]","state":"PUBLISHED","assigner":"Linux","published_at":"2025-10-01 12:15:51","updated_at":"2026-11-05 21:17:22"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796fa","name":"https://git.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5","name":"https://git.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7","name":"https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996","name":"https://git.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1","name":"https://git.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8b","name":"https://git.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485","name":"https://git.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-53487","name":"CVE 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the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas_flash: allow user copy to flash block cache objects\n\nWith hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the\n/proc/powerpc/rtas/firmware_update interface to prepare a system\nfirmware update yields a BUG():\n\n  kernel BUG at mm/usercopy.c:102!\n  Oops: Exception in kernel mode, sig: 5 [#1]\n  LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\n  Modules linked in:\n  CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2\n  Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries\n  NIP:  c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000\n  REGS: c0000000148c76a0 TRAP: 0700   Not tainted  (6.5.0-rc3+)\n  MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002242  XER: 0000000c\n  CFAR: c0000000001fbd34 IRQMASK: 0\n  [ ... GPRs omitted ... ]\n  NIP usercopy_abort+0xa0/0xb0\n  LR  usercopy_abort+0x9c/0xb0\n  Call Trace:\n    usercopy_abort+0x9c/0xb0 (unreliable)\n    __check_heap_object+0x1b4/0x1d0\n    __check_object_size+0x2d0/0x380\n    rtas_flash_write+0xe4/0x250\n    proc_reg_write+0xfc/0x160\n    vfs_write+0xfc/0x4e0\n    ksys_write+0x90/0x160\n    system_call_exception+0x178/0x320\n    system_call_common+0x160/0x2c4\n\nThe blocks of the firmware image are copied directly from user memory\nto objects allocated from flash_block_cache, so flash_block_cache must\nbe created using kmem_cache_create_usercopy() to mark it safe for user\naccess.\n\n[mpe: Trim and indent oops]"}],"providerMetadata":{"dateUpdated":"2026-05-11T19:45:56.368Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796fa"},{"url":"https://git.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485"},{"url":"https://git.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996"},{"url":"https://git.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8b"},{"url":"https://git.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5"},{"url":"https://git.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1"},{"url":"https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7"}],"title":"powerpc/rtas_flash: allow user copy to flash block cache objects","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2023-53487","datePublished":"2025-10-01T11:42:54.747Z","dateReserved":"2025-10-01T11:39:39.402Z","dateUpdated":"2026-11-05T20:31:11.542Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-10-01 12:15:51","lastModifiedDate":"2026-11-05 21:17:22","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-11-05T20:22:14.298181Z","id":"CVE-2023-53487","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"4.19.293","matchCriteriaId":"29FA54C6-8516-4510-AE34-00D336F758D1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.255","matchCriteriaId":"1379E40A-2AC3-484E-929A-7F46B6C3B521"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.192","matchCriteriaId":"9396FFDC-6A0D-44B7-9368-21B456F6D4AE"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.128","matchCriteriaId":"1415629F-F97B-4880-BA1E-AF3DBB8EF305"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.47","matchCriteriaId":"2EEA01B0-0151-4E0F-B140-1A441EEDD717"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.4.12","matchCriteriaId":"CF8ECF64-40AE-49AB-8315-4D83F9F56ECF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*","matchCriteriaId":"0B3E6E4D-E24E-4630-B00C-8C9901C597B0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*","matchCriteriaId":"E4A01A71-0F09-4DB2-A02F-7EFFBE27C98D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc3:*:*:*:*:*:*","matchCriteriaId":"F5608371-157A-4318-8A2E-4104C3467EA1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc4:*:*:*:*:*:*","matchCriteriaId":"2226A776-DF8C-49E0-A030-0A7853BB018A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc5:*:*:*:*:*:*","matchCriteriaId":"6F15C659-DF06-455A-9765-0E6DE920F29A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.5:rc6:*:*:*:*:*:*","matchCriteriaId":"5B1C14ED-ABC4-41D3-8D9C-D38C6A65B4DE"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2023","CveId":"53487","Ordinal":"1","Title":"powerpc/rtas_flash: allow user copy to flash block cache objects","CVE":"CVE-2023-53487","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"53487","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/rtas_flash: allow user copy to flash block cache objects\n\nWith hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the\n/proc/powerpc/rtas/firmware_update interface to prepare a system\nfirmware update yields a BUG():\n\n  kernel BUG at mm/usercopy.c:102!\n  Oops: Exception in kernel mode, sig: 5 [#1]\n  LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\n  Modules linked in:\n  CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2\n  Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries\n  NIP:  c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000\n  REGS: c0000000148c76a0 TRAP: 0700   Not tainted  (6.5.0-rc3+)\n  MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002242  XER: 0000000c\n  CFAR: c0000000001fbd34 IRQMASK: 0\n  [ ... GPRs omitted ... ]\n  NIP usercopy_abort+0xa0/0xb0\n  LR  usercopy_abort+0x9c/0xb0\n  Call Trace:\n    usercopy_abort+0x9c/0xb0 (unreliable)\n    __check_heap_object+0x1b4/0x1d0\n    __check_object_size+0x2d0/0x380\n    rtas_flash_write+0xe4/0x250\n    proc_reg_write+0xfc/0x160\n    vfs_write+0xfc/0x4e0\n    ksys_write+0x90/0x160\n    system_call_exception+0x178/0x320\n    system_call_common+0x160/0x2c4\n\nThe blocks of the firmware image are copied directly from user memory\nto objects allocated from flash_block_cache, so flash_block_cache must\nbe created using kmem_cache_create_usercopy() to mark it safe for user\naccess.\n\n[mpe: Trim and indent oops]","Type":"Description","Title":"powerpc/rtas_flash: allow user copy to flash block cache objects"}]}}}