CVE-2026-93079 (GCVE-0-2026-93079)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11
VLAI
Title
cxl/features: Reject Get Feature count larger than the output buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Get Feature count larger than the output buffer cxlctl_get_feature() sizes its output buffer from the user's fwctl_rpc.out_len, but the device is told to write cxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a separate user-controlled value. Nothing bounds count against out_len, so a small out_len with a large count overflows the kvzalloc()'d buffer. A heap OOB write reachable from FWCTL_RPC. Reject requests where count exceeds the available payload room, before allocating.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5908f3ed6dc209e5c824e63afda7545805f75a7e , < 3f02031a0a53de0d3ef066c92d0486b2b11be40c (git)
Affected: 5908f3ed6dc209e5c824e63afda7545805f75a7e , < 329ea475581c647a680a6937e353c1a6e2534b40 (git)
Affected: 5908f3ed6dc209e5c824e63afda7545805f75a7e , < 4bf6bac375076ced2fa4b3fef8739bd985f93456 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/cxl/core/features.c"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Get Feature count larger than the output buffer\n\ncxlctl_get_feature() sizes its output buffer from the user\u0027s\nfwctl_rpc.out_len, but the device is told to write\ncxl_mbox_get_feat_in.count bytes into rpc_out-\u003epayload, which is a\nseparate user-controlled value. Nothing bounds count against out_len, so\na small out_len with a large count overflows the kvzalloc()\u0027d buffer.\nA heap OOB write reachable from FWCTL_RPC.\n\nReject requests where count exceeds the available payload room, before\nallocating."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:11:00.350Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c"
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          "url": "https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40"
        },
        {
          "url": "https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456"
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      "title": "cxl/features: Reject Get Feature count larger than the output buffer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93079",
    "datePublished": "2026-09-17T16:11:00.350Z",
    "dateReserved": "2026-09-17T15:57:05.661Z",
    "dateUpdated": "2026-09-17T16:11:00.350Z",
    "state": "PUBLISHED"
  },
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                "programFiles": [
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              }
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/features: Reject Get Feature count larger than the output buffer\n\ncxlctl_get_feature() sizes its output buffer from the user\u0027s\nfwctl_rpc.out_len, but the device is told to write\ncxl_mbox_get_feat_in.count bytes into rpc_out-\u003epayload, which is a\nseparate user-controlled value. Nothing bounds count against out_len, so\na small out_len with a large count overflows the kvzalloc()\u0027d buffer.\nA heap OOB write reachable from FWCTL_RPC.\n\nReject requests where count exceeds the available payload room, before\nallocating."
          }
        ],
        "id": "CVE-2026-93079",
        "lastModified": "2026-09-17T17:18:01.850",
        "metrics": {},
        "published": "2026-09-17T17:18:01.850",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:12:32Z",
      "cve": "CVE-2026-93079",
      "id": "CVE-2026-93079",
      "initial_release_date": "2026-09-18T00:12:32Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93079",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93079.json",
      "version": "2"
    }
  }
}



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