CVE-2023-53487 (GCVE-0-2023-53487)
Vulnerability from cvelistv5 – Published: 2025-10-01 11:42 – Updated: 2026-05-11 19:45
VLAI
EPSS
VEX
Title
powerpc/rtas_flash: allow user copy to flash block cache objects
Summary
In the Linux kernel, the following vulnerability has been resolved:
powerpc/rtas_flash: allow user copy to flash block cache objects
With hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the
/proc/powerpc/rtas/firmware_update interface to prepare a system
firmware update yields a BUG():
kernel BUG at mm/usercopy.c:102!
Oops: Exception in kernel mode, sig: 5 [#1]
LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
Modules linked in:
CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2
Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries
NIP: c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000
REGS: c0000000148c76a0 TRAP: 0700 Not tainted (6.5.0-rc3+)
MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 24002242 XER: 0000000c
CFAR: c0000000001fbd34 IRQMASK: 0
[ ... GPRs omitted ... ]
NIP usercopy_abort+0xa0/0xb0
LR usercopy_abort+0x9c/0xb0
Call Trace:
usercopy_abort+0x9c/0xb0 (unreliable)
__check_heap_object+0x1b4/0x1d0
__check_object_size+0x2d0/0x380
rtas_flash_write+0xe4/0x250
proc_reg_write+0xfc/0x160
vfs_write+0xfc/0x4e0
ksys_write+0x90/0x160
system_call_exception+0x178/0x320
system_call_common+0x160/0x2c4
The blocks of the firmware image are copied directly from user memory
to objects allocated from flash_block_cache, so flash_block_cache must
be created using kmem_cache_create_usercopy() to mark it safe for user
access.
[mpe: Trim and indent oops]
Severity
7.8 (High)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
6d07d1cd300f4c7e16005f881fea388164999cc8 , < 8f09cc15dcd91d16562400c51d24c7be0d5796fa
(git)
Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < 1d29e21ed09fa668416fa7721e08d451b9903485 (git) Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < 0ba7f969be599e21d4b1f1e947593de6515f4996 (git) Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < 8ef25fb13494e35c6dbe15445c7875fa92bc3e8b (git) Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < b8fee83aa4ed3846c7f50a0b364bc699f48d96e5 (git) Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < 6acb8a453388374fafb3c3b37534b675b2aa0ae1 (git) Affected: 6d07d1cd300f4c7e16005f881fea388164999cc8 , < 4f3175979e62de3b929bfa54a0db4b87d36257a7 (git) |
guessed | |
| Linux | Linux |
Affected:
4.16
Unaffected: 0 , < 4.16 (semver) Unaffected: 4.19.293 , ≤ 4.19.* (semver) Unaffected: 5.4.255 , ≤ 5.4.* (semver) Unaffected: 5.10.192 , ≤ 5.10.* (semver) Unaffected: 5.15.128 , ≤ 5.15.* (semver) Unaffected: 6.1.47 , ≤ 6.1.* (semver) Unaffected: 6.4.12 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
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"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 \u003cSF,EE,ME,IR,DR,RI,LE\u003e 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]"
}
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"url": "https://git.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7"
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"title": "powerpc/rtas_flash: allow user copy to flash block cache objects",
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"datePublished": "2025-10-01T11:42:54.747Z",
"dateReserved": "2025-10-01T11:39:39.402Z",
"dateUpdated": "2026-05-11T19:45:56.368Z",
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"date": "2026-09-15",
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oops]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/powerpc/kernel/rtas_flash.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"8f09cc15dcd91d16562400c51d24c7be0d5796fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"1d29e21ed09fa668416fa7721e08d451b9903485\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"0ba7f969be599e21d4b1f1e947593de6515f4996\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"8ef25fb13494e35c6dbe15445c7875fa92bc3e8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"b8fee83aa4ed3846c7f50a0b364bc699f48d96e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"6acb8a453388374fafb3c3b37534b675b2aa0ae1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6d07d1cd300f4c7e16005f881fea388164999cc8\",\"lessThan\":\"4f3175979e62de3b929bfa54a0db4b87d36257a7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/powerpc/kernel/rtas_flash.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.293\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.255\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.192\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.128\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.47\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4.12\",\"lessThanOrEqual\":\"6.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"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:l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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-29T22:24:15+00:00",
"cve": "CVE-2023-53487",
"id": "CVE-2023-53487",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "279",
"product_status:known_affected": "84",
"product_status:known_not_affected": "104",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: powerpc/rtas_flash: allow user copy to flash block cache objects",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53487.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T02:20:58Z",
"cve": "CVE-2023-53487",
"id": "CVE-2023-53487",
"initial_release_date": "2025-10-02T23:58:03Z",
"product_status:known_affected": "413",
"product_status:known_not_affected": "196",
"product_status:recommended": "545",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-53487",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53487.json",
"version": "51"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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