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svcrdma: Validate Read chunk positions before reconstruction

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Validate Read chunk positions before reconstruction The RPC/RDMA Read chunk position field is supplied by the remote client and stored verbatim in the parsed chunk list. xdr_count_read_segments() checks only 4-byte alignment; it never compares the position against the received inline body length. In the single-chunk path, svc_rdma_read_complete_one() splits the head and tail kvecs at ch_position. A position past the inline body underflows the tail length, exposing adjacent slab memory to the upper XDR decoder. In the multi-chunk path, svc_rdma_read_multiple_chunks() computes gap lengths between chunks as unsigned subtractions from ch_position. Overlapping Read chunks cause these subtractions to underflow. A final position past the inline body likewise underflows the trailing gap length. svc_rdma_copy_inline_range() then copies past the receive buffer into request pages that are returned to the client through the Reply channel. Bound inline-range copies in svc_rdma_copy_inline_range() against the decoded inline RPC body saved in rc_saved_arg. Reject a single Read chunk positioned beyond that body, and reject multi-chunk lists where accumulated read bytes exceed the next chunk's position. Apply the same position and overlap checks in the call-chunk interleaving path.

Announced Source revision 1
Original source ↗

CVE-2026-89526

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-2026-89526

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": "d96962e6d0e281bab6a48e83b42f5dce6eb28bf4",
        "lessThan": "3861eeabaebe243050952b34063763527c44e1fe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d96962e6d0e281bab6a48e83b42f5dce6eb28bf4",
        "lessThan": "5ab3f6d882fe07ae5e61d0bcfeea00b9409155c2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d96962e6d0e281bab6a48e83b42f5dce6eb28bf4",
        "lessThan": "f84ec84d8d4bc65f9ae23372570349687f66fa39",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d96962e6d0e281bab6a48e83b42f5dce6eb28bf4",
        "lessThan": "577097455d084610fc31e91e6a61c5793b6f04ba",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d96962e6d0e281bab6a48e83b42f5dce6eb28bf4",
        "lessThan": "3779b7b9e7d1c8ba4738f9d327de3b0288cefe9b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sunrpc/xprtrdma/svc_rdma_rw.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.11",
        "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_rw.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89526

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#46668 · Revision 1
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Publisher date
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