GHSA-5Q5Q-53H5-V4V4
Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-22 15:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-31464"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-22T14:16:42Z",
"severity": null
},
"details": "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.",
"id": "GHSA-5q5q-53h5-v4v4",
"modified": "2026-04-22T15:31:41Z",
"published": "2026-04-22T15:31:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31464"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.