CVE-2026-89456 (GCVE-0-2026-89456)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-10-19 08:47
VLAI
EPSS
VEX
Title
s390/dasd: Propagate partial completion length across ERP recovery
Summary
In the Linux kernel, the following vulnerability has been resolved:
s390/dasd: Propagate partial completion length across ERP recovery
dasd_default_erp_postaction() copies the timing and device state from
the finished ERP request back to the original request but drops
proc_bytes. A request that was partially completed, an ESE read of a
not-yet-allocated track returns fewer bytes than requested, and then
recovered through the ERP chain loses its partial-completion length.
__dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole
request instead of requeueing the remainder, silently returning zeroed
data for the part that was never read.
Carry proc_bytes over to the original request like the other
per-request state.
Severity
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
5e6bdd37c5526ef01326df5dabb93011ee89237e , < 9e063165d3fe58db2a517717b830f17e82d03467
(git)
Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < 6b0954c8a259da1e4aa745989f82723947acfb46 (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < f735b9710f0c8fe72c1060103e865f4ae678190b (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < d6b8778b1b82aa3a8dbf8612080f635b834bd16b (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < ceafb262475ac6cb3a7d07b1102608be2b216b99 (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < 15ec03452c18e8d288e519837d21b308300d74b2 (git) Affected: 5e6bdd37c5526ef01326df5dabb93011ee89237e , < 6fb5ba2e7e43173a3761e46f091070a8185efa14 (git) Affected: fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04 (git) Affected: 5f7c9989f11305aaa43e0f4378f4f070022a9f2b (git) Affected: 5.4.26 , < 5.5 (semver) Affected: 5.5.10 , < 5.6 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.6
Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
"drivers/s390/block/dasd_erp.c"
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"version": "5.5.10",
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}
]
},
{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.270",
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{
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"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
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"version": "6.6.157",
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},
{
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"status": "unaffected",
"version": "6.12.109",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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{
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},
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Propagate partial completion length across ERP recovery\n\ndasd_default_erp_postaction() copies the timing and device state from\nthe finished ERP request back to the original request but drops\nproc_bytes. A request that was partially completed, an ESE read of a\nnot-yet-allocated track returns fewer bytes than requested, and then\nrecovered through the ERP chain loses its partial-completion length.\n__dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole\nrequest instead of requeueing the remainder, silently returning zeroed\ndata for the part that was never read.\n\nCarry proc_bytes over to the original request like the other\nper-request state."
}
],
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is in the s390 DASD block driver\u0027s ERP postaction and is reached only by local block I/O to an ESE (thin-provisioned) volume, via a DASD-backed filesystem or /dev/dasd*; no ksmbd, nfsd, or packet path parses attacker data into this code.\nAC:H - Exploitation needs an ESE NRF partial read whose CQR is an ERP retry, so a prior hardware-reported unit check or similar recoverable error must occur; the attacker cannot inject sense data or craft CCWs, which the driver builds itself.\nPR:L - Unprivileged local users trigger the path through ordinary read/write syscalls on files stored on a DASD-backed filesystem; dasd_open and do_dasd_request impose no capability check on that I/O path.\nUI:N - The attacker performs the I/O themselves; no second user must mount a volume, open a file, or otherwise interact.\nS:U - Incorrect request completion affects host kernel block I/O and page-cache contents on the same LPAR; it is not a KVM/vfio-ccw guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - Dropping proc_bytes completes the unread remainder as success, so page-cache pages the driver never filled \u2014 stale previously freed kernel or other tenants\u0027 memory \u2014 are marked uptodate and returned to userspace as valid file data.\nI:H - Tracks after the unallocated ESE hole are never fetched yet the whole request succeeds, substituting zeros or stale bytes for real disk contents that filesystems may write back, permanently corrupting co-resident file data and metadata.\nA:H - Successful completion of filesystem, journal, or executable reads with zeros or stale data can corrupt metadata parsers and trigger ext4 errors=panic or XFS forced shutdown, taking IBM Z/LinuxONE storage nodes down."
}
]
}
],
"providerMetadata": {
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"url": "https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46"
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},
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"datePublished": "2026-09-11T19:43:20.037Z",
"dateReserved": "2026-09-11T19:38:34.707Z",
"dateUpdated": "2026-10-19T08:47:05.735Z",
"state": "PUBLISHED"
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"date": "2026-11-08",
"epss": "0.00149",
"percentile": "0.04125"
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"product": "Linux",
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{
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"version": "6.6.157",
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{
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"version": "6.12.109",
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{
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{
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"version": "7.2.4",
"versionType": "semver"
},
{
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"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Propagate partial completion length across ERP recovery\n\ndasd_default_erp_postaction() copies the timing and device state from\nthe finished ERP request back to the original request but drops\nproc_bytes. A request that was partially completed, an ESE read of a\nnot-yet-allocated track returns fewer bytes than requested, and then\nrecovered through the ERP chain loses its partial-completion length.\n__dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole\nrequest instead of requeueing the remainder, silently returning zeroed\ndata for the part that was never read.\n\nCarry proc_bytes over to the original request like the other\nper-request state."
}
],
"id": "CVE-2026-89456",
"lastModified": "2026-10-19T09:17:37.887",
"metrics": {
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{
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"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.0,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-09-11T20:19:26.387",
"references": [
{
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"url": "https://git.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2"
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{
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"url": "https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46"
},
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"url": "https://git.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14"
},
{
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"url": "https://git.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467"
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{
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"url": "https://git.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f"
},
{
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{
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:15:08+00:00",
"cve": "CVE-2026-89456",
"id": "CVE-2026-89456",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_affected": "112",
"product_status:known_not_affected": "91",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: s390/dasd: Propagate partial completion length across ERP recovery",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89456.json",
"version": "3"
}
}
}
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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.