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]"
}
],
"id": "CVE-2023-53487",
"lastModified": "2026-06-17T06:45:27.100",
"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"
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},
"published": "2025-10-01T12:15:51.637",
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"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"
}
]
}
},
"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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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