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svcrdma: Reject inline replies that overflow the pull-up buffer

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject inline replies that overflow the pull-up buffer An RPC-over-RDMA client can request a reply, such as an NFS READ payload, without providing a Write list or a Reply chunk to carry it. When such a reply needs more scatter/gather entries than the device's Send Queue supports, svc_rdma_pull_up_needed() selects pull-up and svc_rdma_pull_up_reply_msg() linearizes the whole reply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size bytes, while the reply on this path is bounded only by the client's request, so svc_rdma_xb_linearize() copies past the end of the buffer and corrupts adjacent slab memory. The oversized length is then stored in sc_sges[0].length and posted, so the device also reads beyond the mapped region. The SGE-exhaustion branch is the only pull-up path that can exceed the buffer: the threshold branch pulls up only replies smaller than RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE budget are sent directly without linearization. Make svc_rdma_pull_up_needed() report -E2BIG when the reply it would pull up cannot fit sc_max_req_size, and fail the request with ERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping the connection. The helper no longer answers a simple yes/no question: it now reports pull-up, no pull-up, or -E2BIG for a reply too large to linearize. Rename svc_rdma_pull_up_needed() to svc_rdma_check_pull_up() so its name no longer implies a

Announced Source revision 1
Original source ↗

CVE-2026-89530

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-2026-89530

Linux

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

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

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": "e248aa7be86e8179f20ac0931774ecd746f3f5bf",
        "lessThan": "8068358f445a11296328ffa7c524701596814a17",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf",
        "lessThan": "fcd91b9957462d398792201c239dffaeff1cc8b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf",
        "lessThan": "1949dd1576f7a8aa161b1330c6125df9d53046d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf",
        "lessThan": "8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e248aa7be86e8179f20ac0931774ecd746f3f5bf",
        "lessThan": "0fbe20dfe74b783d255bf389a6ea77aa25dc7860",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9b65b18f817d9ada2bf67351f24bdcce6789a0bb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d564356e1919d1178568c19af410cfc1a9076663",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.19.22",
        "lessThan": "4.20",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.20.9",
        "lessThan": "4.21",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/sunrpc/xprtrdma/svc_rdma_sendto.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "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/svc_rdma_sendto.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89530

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#46671 · Revision 1
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Publisher date
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