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svcrdma: Use svc_xprt_put to free listener on create failure

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Use svc_xprt_put to free listener on create failure svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.191, 6.12.113, 6.18.56, 6.6.160, 7.2.4
CVEs
CVE-2026-89527
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 17:05 UTC · Revision 1

Source evidence

svcrdma: Use svc_xprt_put to free listener on create failure

core-osv · Original source

Published 11 Sept 2026, 19:44 UTC

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Use svc_xprt_put to free listener on create failure svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path.

osv:CVE-2026-89527

Kernel

Fixed versions: 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.4

Complete source record
{
  "id": "2ea16b3a7888d25373d5014516a32bafc489cfb5c7b077f3954d9d7060331b04",
  "url": "https://osv.dev/vulnerability/CVE-2026-89527",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "svcrdma: Use svc_xprt_put to free listener on create failure",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: svcrdma: Use svc_xprt_put to free listener on create failure svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path.",
    "evidence": "osv:CVE-2026-89527",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.113",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89527",
      "aliases": [
        "CVE-2026-89527"
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                },
                {
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                },
                {
                  "fixed": "ee70d690b5544b736706a9a5796aafb634013f54"
                },
                {
                  "fixed": "e68380710fc970e07610b2f42594575ad35fdb1c"
                },
                {
                  "fixed": "ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6"
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                {
                  "fixed": "e346ef7bcb137f50c49f969330ab7dcf64ea1654"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89527.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.37"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.160"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.113"
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.56"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89527.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:49.952537679Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2e35ec558b8cece9399a50141ecaeadbdb8768dc",
        "https://git.kernel.org/stable/c/31b8293495ba94ccf494e556a318886b716884b6",
        "https://git.kernel.org/stable/c/ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6",
        "https://git.kernel.org/stable/c/e346ef7bcb137f50c49f969330ab7dcf64ea1654",
        "https://git.kernel.org/stable/c/e68380710fc970e07610b2f42594575ad35fdb1c",
        "https://git.kernel.org/stable/c/ee70d690b5544b736706a9a5796aafb634013f54",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89527.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89527",
        "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/2026/89xxx/CVE-2026-89527.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89527",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519942,
  "published_at": "2026-09-11T19:44:07.785+00:00"
}