RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ

{
  "id": "464a93e59908cd294d87d10978a437373b19f5253ca325da7d3092a4dd486629",
  "url": "https://osv.dev/vulnerability/CVE-2026-90307",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/srp: fix heap information leak on a truncated SRP_CRED_REQ srp_recv_done() passes wc->byte_len to srp_process_rsp(). It passes nothing to srp_process_cred_req() and srp_process_aer_req(), which read fixed-size fields from the receive buffer without checking that those fields were received. The buffer size is max_ti_iu_len, which comes from the login response and is not validated. A target that advertises 8 and then sends an 8-byte SRP_CRED_REQ makes the initiator read req->tag from beyond the end of the buffer. req->tag is copied into the SRP_CRED_RSP and sent back, so those bytes reach the target. SRP_AER_REQ behaves the same way and also reads req->lun. The leak is 8 bytes per response. max_ti_iu_len also decides which slab cache the buffer comes from. With 8 the buffer is a kmalloc-8 object and the read is entirely outside it: BUG: KASAN: slab-out-of-bounds in srp_recv_done+0x172b/0x1aa0 Read of size 8 at addr ffff888104714da8 by task kworker/u8:3/50 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888104714da0, ffff888104714da8) Without KASAN the returned bytes are whatever is next in the slab. One run returned \".strtab\". rsp->data[3] in srp_process_rsp() has the same problem: only resp_data_len is checked before it is read. Drop a request that is shorter than the structure being parsed, and check byte_len before the tsk_",
    "evidence": "osv:CVE-2026-90307",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
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            "value": "5.15.221",
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            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
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            "value": "6.18.52",
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            "evidence": "/affected/1/ranges"
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        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90307",
      "aliases": [
        "CVE-2026-90307"
      ],
      "affected": [
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                  "fixed": "138eb2f0ef02adfe6ad126afad5b54c56b5046ee"
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                {
                  "fixed": "3787f4c3e0d813d6c56be9f6dfaf66f8551fb0a7"
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                {
                  "fixed": "0e7ba617514902501514d577647d866e670dad90"
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                {
                  "fixed": "001adf2fe87d1ab677c014a97467bbea5153ae5f"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:25.705543083Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/001adf2fe87d1ab677c014a97467bbea5153ae5f",
        "https://git.kernel.org/stable/c/0e7ba617514902501514d577647d866e670dad90",
        "https://git.kernel.org/stable/c/138eb2f0ef02adfe6ad126afad5b54c56b5046ee",
        "https://git.kernel.org/stable/c/3787f4c3e0d813d6c56be9f6dfaf66f8551fb0a7",
        "https://git.kernel.org/stable/c/3f7fdf561f1ec3b523c39708df00bd808671668d",
        "https://git.kernel.org/stable/c/961ac0f0c5e414abdd6b33fae84b311d9fde0bd0",
        "https://git.kernel.org/stable/c/dc2272c00d7c00ee2a69b57f7ca9caaefcbdb8cd",
        "https://git.kernel.org/stable/c/fa1b33fdab3e79dce83721ead3220200a2dbec22",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90307.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90307",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90307.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90307",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492528,
  "published_at": "2026-09-17T16:08:29.045+00:00"
}