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svcrdma: Fix unmatched rn_unregister on failed accept

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Fix unmatched rn_unregister on failed accept When svc_rdma_accept() takes the errout path before rpcrdma_rn_register() has succeeded, the existing cleanup block calls rpcrdma_rn_unregister(dev, &newxprt->sc_rn) unconditionally. svcxprt_rdma is kzalloc'd, so on that path sc_rn.rn_index is 0 and sc_rn.rn_done is NULL; the unregister therefore xa_erase()s another caller's slot 0 and performs an unmatched kref_put() on the rpcrdma_device's rd_kref. The same errout also brackets the cleanup with svc_xprt_get()/ svc_xprt_put() around the kref_init() birth reference. The kref goes 1 -> 2 -> 1 and never reaches 0, so the svcxprt_rdma (and the net/ns_tracker it pinned) is leaked on every failed accept. rpcrdma_rn_register() writes rn->rn_done last, only after xa_alloc() and kref_get() have both succeeded, so rn_done == NULL is a natural "never registered" sentinel. Guard rpcrdma_rn_unregister() with an early return when rn_done is NULL, and clear rn_done before the matching xa_erase() so a repeated unregister is also a no-op. With that guard in place, the accept errout drops the kref_init() birth reference via svc_xprt_put(), which dispatches svc_rdma_free(). Teardown of sc_qp, sc_sq_cq, sc_rq_cq, and sc_pd runs under existing IS_ERR/NULL guards in svc_rdma_free(); sc_rn is covered by the new rn_done sentinel; sc_cm_id is non-NULL on every errout path because svc_rdma_accept() dereferences it above the first

Announced Source revision 1
Original source ↗

CVE-2026-93224

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93224

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "cb3cba0ec372fa7c5f5f5c12990bef02e458ab86",
        "lessThan": "0335800071a6dfdf7d21d729b5e7d8fa98936211",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932",
        "lessThan": "5aabe070c00e5bdf4ab150fb5f72ad5f266d6241",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932",
        "lessThan": "45a444a17240f4fa2235f0dfd4a96fc80f1eb2c2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ac6fcae5dc0e801f1c82a83f5ae2c0a4db19932",
        "lessThan": "26190394c64c9429481fc88a4738f70bb92fb352",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d310955106c358c8e1ea682defd8e21af44a6cba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.12.35",
        "lessThan": "6.12.109",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.15.4",
        "lessThan": "6.16",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/sunrpc/xprtrdma/ib_client.c",
      "net/sunrpc/xprtrdma/svc_rdma_transport.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sunrpc/xprtrdma/ib_client.c",
      "net/sunrpc/xprtrdma/svc_rdma_transport.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93224

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#37924 · Revision 1
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Publisher date
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