CVE-2023-53487

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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]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/powerpc/kernel/rtas_flash.c"], "versions": [{"version": "6d07d1cd300f4c7e16005f881fea388164999cc8", "lessThan": "8f09cc15dcd91d16562400c51d24c7be0d5796fa", "status": "affected", 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"versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "4.19.293"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.4.255"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.192"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.47"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", 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"role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T20:22:14.298181Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T20:31:11.542Z"}}]}}

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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]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.293", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.255", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.192", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.128", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.47", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.4.12", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5", "versionStartIncluding": "4.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:45:56.368Z"}}}, "cveMetadata": {"cveId": "CVE-2023-53487", "state": "PUBLISHED", "dateUpdated": "2026-11-05T20:31:11.542Z", "dateReserved": "2025-10-01T11:39:39.402Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-10-01T11:42:54.747Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"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", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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]"}], "id": "CVE-2023-53487", "lastModified": "2026-11-05T21:17:22.697", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53487", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:22:14.298181Z", "version": "2.0.3"}}]}, "published": "2025-10-01T12:15:51.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: powerpc/rtas_flash: allow user copy to flash block cache objects", "id": "2400784", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400784"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53487", "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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "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": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53487\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53487\nhttps://lore.kernel.org/linux-cve-announce/2025100115-CVE-2023-53487-c3f7@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-02T08:39:37.975506+00:00", "updated": "2025-10-02T08:39:37.975560+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}