CVE-2026-31464 (GCVE-0-2026-31464)
Vulnerability from cvelistv5
Published
2026-04-22 13:53
Modified
2026-04-27 14:03
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
A malicious or compromised VIO server can return a num_written value in the
discover targets MAD response that exceeds max_targets. This value is
stored directly in vhost->num_targets without validation, and is then used
as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which
is only allocated for max_targets entries. Indices at or beyond max_targets
access kernel memory outside the DMA-coherent allocation. The
out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI
MADs that are sent back to the VIO server, leaking kernel memory.
Fix by clamping num_written to max_targets before storing it.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 Version: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 |
||
{
"containers": {
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"versions": [
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"version": "2.6.27"
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"version": "0",
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},
{
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},
{
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"version": "5.15.203",
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},
{
"lessThanOrEqual": "6.1.*",
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},
{
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"version": "6.6.131",
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{
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"version": "6.12.80",
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{
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},
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"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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}
],
"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()\n\nA malicious or compromised VIO server can return a num_written value in the\ndiscover targets MAD response that exceeds max_targets. This value is\nstored directly in vhost-\u003enum_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation. The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T14:03:20.476Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3"
},
{
"url": "https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc"
},
{
"url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89"
},
{
"url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161"
},
{
"url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780"
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{
"url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983"
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{
"url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db"
},
{
"url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f"
}
],
"title": "scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31464",
"datePublished": "2026-04-22T13:53:54.970Z",
"dateReserved": "2026-03-09T15:48:24.097Z",
"dateUpdated": "2026-04-27T14:03:20.476Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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