CVE-2023-54092 (GCVE-0-2023-54092)
Vulnerability from cvelistv5 – Published: 2025-12-24 13:06 – Updated: 2026-10-15 21:41
VLAI
EPSS
VEX
Title
KVM: s390: pv: fix index value of replaced ASCE
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: s390: pv: fix index value of replaced ASCE
The index field of the struct page corresponding to a guest ASCE should
be 0. When replacing the ASCE in s390_replace_asce(), the index of the
new ASCE should also be set to 0.
Having the wrong index might lead to the wrong addresses being passed
around when notifying pte invalidations, and eventually to validity
intercepts (VM crash) if the prefix gets unmapped and the notifier gets
called with the wrong address.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:38 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
9d216035d173214cd33712d67d89220ef2283ebf , < 8e635da0e0d3cb45e32fa79b36218fb98281bc10
(git)
Affected: 81ea65c9aefe100a9ace3082649bd84ae7dd9764 , < 49a2686adddebe1ae76b4d368383208656ef6606 (git) Affected: faa2f72cb3569256480c5540d242c84e99965160 , < 017f686bcb536ff23d49c143fdf9d1fd89a9a924 (git) Affected: faa2f72cb3569256480c5540d242c84e99965160 , < f1c7a776338f2ac5e34da40e58fe9f33ea390a5e (git) Affected: faa2f72cb3569256480c5540d242c84e99965160 , < c2fceb59bbda16468bda82b002383bff59de89ab (git) Affected: b5477f53e1d4de6191f50748a027251b14952eeb (git) Affected: 63c71e83d5b6ab8adb5fcebef977052048016957 (git) Affected: 5.10.137 , < 5.10.190 (semver) Affected: 5.15.61 , < 5.15.124 (semver) Affected: 5.18.18 , < 5.19 (semver) Affected: 5.19.2 , < 5.20 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 5.10.190 , ≤ 5.10.* (semver) Unaffected: 5.15.124 , ≤ 5.15.* (semver) Unaffected: 6.1.43 , ≤ 6.1.* (semver) Unaffected: 6.4.8 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
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"lessThan": "5.20",
"status": "affected",
"version": "5.19.2",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/s390/mm/gmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"lessThan": "6.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.190",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.124",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.43",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.4.*",
"status": "unaffected",
"version": "6.4.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.190",
"versionStartIncluding": "5.10.137",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.124",
"versionStartIncluding": "5.15.61",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.43",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.4.8",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.5",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.18.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.19.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pv: fix index value of replaced ASCE\n\nThe index field of the struct page corresponding to a guest ASCE should\nbe 0. When replacing the ASCE in s390_replace_asce(), the index of the\nnew ASCE should also be set to 0.\n\nHaving the wrong index might lead to the wrong addresses being passed\naround when notifying pte invalidations, and eventually to validity\nintercepts (VM crash) if the prefix gets unmapped and the notifier gets\ncalled with the wrong address."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is entered through the local KVM_S390_PV_COMMAND ioctl on /dev/kvm (KVM_PV_ASYNC_CLEANUP_PREPARE) or the PV deinit path, requiring local access to the host; alternatively it is driven by a hosted guest rebooting out of secure mode. There is no network-facing entry point.\nAC:L - The attacker owning the VM controls every relevant precondition \u2014 the guest size that selects a segment-type ASCE, the timing and repetition of the secure-to-normal teardown, and page-allocator grooming that determines the stale page-\u003eindex handed back by alloc_pages. Repeated reboot/teardown cycles let the attacker retry freely, so no condition lies outside the attacker\u0027s influence.\nPR:L - Triggering requires only the ability to open /dev/kvm and create/run a protected VM, which is granted to ordinary unprivileged accounts (kvm group / VMM service user) rather than real root; the same path is reachable by an already-running guest that reboots.\nUI:N - No victim action is needed \u2014 the guest reboot or the ioctl sequence issued by the attacker\u0027s own VMM drives the whole sequence automatically.\nS:C - The defect is in host kernel gmap/KVM code but its effects land across the guest/host virtualization boundary: missed prefix notifications crash the guest VM, and the mis-addressed IDTE leaves guest TLB translations alive for host pages the host has already unmapped, giving the guest reach outside its assigned memory.\nC:H - Because __pmdp_idte() purges the TLB for the wrong guest address while the pmd entry is cleared, the guest retains a valid stale translation to a host page that is subsequently freed and reallocated, allowing it to read arbitrary reused host memory.\nI:H - The same stale translation is writable, so the guest can corrupt host memory that has been recycled for other purposes; in addition, corrupted gaddr values drive DAT-table invalidation and gmap pmd bookkeeping with attacker-influenced wrong addresses.\nA:H - The commit itself states the wrong index leads to validity intercepts and a VM crash when the prefix is unmapped and the notifier is called with the wrong address, and the condition can be re-triggered on every teardown cycle."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:17:10.381Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8e635da0e0d3cb45e32fa79b36218fb98281bc10"
},
{
"url": "https://git.kernel.org/stable/c/49a2686adddebe1ae76b4d368383208656ef6606"
},
{
"url": "https://git.kernel.org/stable/c/017f686bcb536ff23d49c143fdf9d1fd89a9a924"
},
{
"url": "https://git.kernel.org/stable/c/f1c7a776338f2ac5e34da40e58fe9f33ea390a5e"
},
{
"url": "https://git.kernel.org/stable/c/c2fceb59bbda16468bda82b002383bff59de89ab"
}
],
"title": "KVM: s390: pv: fix index value of replaced ASCE",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-54092",
"datePublished": "2025-12-24T13:06:21.092Z",
"dateReserved": "2025-12-24T13:02:52.516Z",
"dateUpdated": "2026-10-15T21:41:39.384Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.