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GHSA-QHX3-PWWP-V2CP

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

xprtrdma: Sanitize the reply credit grant after parsing

The out_norqst exit in rpcrdma_reply_handler() branches away before the credit clamp, so a reply that matches no pending request reaches out_post carrying the raw credit value parsed from the wire. rpcrdma_post_recvs() does not bound its @needed argument: the refill loop allocates and chains Receive WRs until the count is satisfied or allocation fails. A peer that sends a well-formed reply carrying an unknown XID and an inflated credit grant therefore drives rep allocation and Receive posting past re_max_requests on every such reply.

Move the clamp to immediately after the credit field is parsed, ahead of the first branch that can reach out_post, so every later consumer sees a sanitized value. The cwnd update stays on the matched-request path.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72465"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:20Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Sanitize the reply credit grant after parsing\n\nThe out_norqst exit in rpcrdma_reply_handler() branches away before\nthe credit clamp, so a reply that matches no pending request reaches\nout_post carrying the raw credit value parsed from the wire.\nrpcrdma_post_recvs() does not bound its @needed argument: the refill\nloop allocates and chains Receive WRs until the count is satisfied or\nallocation fails. A peer that sends a well-formed reply carrying an\nunknown XID and an inflated credit grant therefore drives rep\nallocation and Receive posting past re_max_requests on every such\nreply.\n\nMove the clamp to immediately after the credit field is parsed,\nahead of the first branch that can reach out_post, so every later\nconsumer sees a sanitized value. The cwnd update stays on the\nmatched-request path.",
  "id": "GHSA-qhx3-pwwp-v2cp",
  "modified": "2026-08-17T06:33:31Z",
  "published": "2026-08-15T06:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72465"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33db78b1b24fc6a464ae08aa4d2538c5f883eb5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41634242140173eabbf54f899f9c70b5c685e786"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/469b22376ee73369711ecf2761bd122ef4195963"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cf332b3d82d73ffceedca6b4a120be074172021"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8be1bb378def94a5cb8f7527a191e476407118ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3a628aab2dc8f5fd7bff86ceaeae64de590e60a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72465 (GCVE-0-2026-72465)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44

Title

xprtrdma: Sanitize the reply credit grant after parsing

Summary

In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Sanitize the reply credit grant after parsing The out_norqst exit in rpcrdma_reply_handler() branches away before the credit clamp, so a reply that matches no pending request reaches out_post carrying the raw credit value parsed from the wire. rpcrdma_post_recvs() does not bound its @needed argument: the refill loop allocates and chains Receive WRs until the count is satisfied or allocation fails. A peer that sends a well-formed reply carrying an unknown XID and an inflated credit grant therefore drives rep allocation and Receive posting past re_max_requests on every such reply. Move the clamp to immediately after the credit field is parsed, ahead of the first branch that can reach out_post, so every later consumer sees a sanitized value. The cwnd update stays on the matched-request path.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

6 references

URL	Tags
https://git.kernel.org/stable/c/7cf332b3d82d73ffc…
https://git.kernel.org/stable/c/41634242140173eab…
https://git.kernel.org/stable/c/8be1bb378def94a5c…
https://git.kernel.org/stable/c/469b22376ee733697…
https://git.kernel.org/stable/c/33db78b1b24fc6a46…
https://git.kernel.org/stable/c/c3a628aab2dc8f5fd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d01d6670c169316115b26dfb3585a73dfe40b563 , < 7cf332b3d82d73ffceedca6b4a120be074172021 (git) Affected: d1b159356a3584943192712392fcb2439aafb8c1 , < 41634242140173eabbf54f899f9c70b5c685e786 (git) Affected: 17da9e0caa8615f6fc3b4022eadbd78a9aea1a2a , < 8be1bb378def94a5cb8f7527a191e476407118ec (git) Affected: e7ae0883c8c89b901226de43862184bf37054338 , < 469b22376ee73369711ecf2761bd122ef4195963 (git) Affected: 704f3f640f72db4d44ec5ce3db8d4e150c974bc7 , < 33db78b1b24fc6a464ae08aa4d2538c5f883eb5e (git) Affected: 704f3f640f72db4d44ec5ce3db8d4e150c974bc7 , < c3a628aab2dc8f5fd7bff86ceaeae64de590e60a (git)
Linux	Linux	Affected: 7.1 Unaffected: 0 , < 7.1 (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtrdma/rpc_rdma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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              "versionType": "git"
            },
            {
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              "lessThan": "8be1bb378def94a5cb8f7527a191e476407118ec",
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              "versionType": "git"
            },
            {
              "lessThan": "469b22376ee73369711ecf2761bd122ef4195963",
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "c3a628aab2dc8f5fd7bff86ceaeae64de590e60a",
              "status": "affected",
              "version": "704f3f640f72db4d44ec5ce3db8d4e150c974bc7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "7.1"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Sanitize the reply credit grant after parsing\n\nThe out_norqst exit in rpcrdma_reply_handler() branches away before\nthe credit clamp, so a reply that matches no pending request reaches\nout_post carrying the raw credit value parsed from the wire.\nrpcrdma_post_recvs() does not bound its @needed argument: the refill\nloop allocates and chains Receive WRs until the count is satisfied or\nallocation fails. A peer that sends a well-formed reply carrying an\nunknown XID and an inflated credit grant therefore drives rep\nallocation and Receive posting past re_max_requests on every such\nreply.\n\nMove the clamp to immediately after the credit field is parsed,\nahead of the first branch that can reach out_post, so every later\nconsumer sees a sanitized value. The cwnd update stays on the\nmatched-request path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The flaw is in the NFS-over-RDMA client receive path: rpcrdma_wc_receive() delivers remote RDMA reply completions to rpcrdma_reply_handler(), so a malicious or compromised NFS/RDMA server can send crafted replies over InfiniBand/RoCE/iWARP without local access.\nAC:L - On an established RPC/RDMA session the peer fully controls inbound replies and can reliably send well-formed headers with an unknown XID and an inflated credit grant on every message, deterministically reaching out_norqst and out_post without races or special victim state.\nPR:N - Exploitation requires only network reachability as the connected RDMA/RPC peer; the attacker does not need local accounts, mount privileges, or namespaced capabilities on the victim NFS client to deliver malicious reply traffic.\nUI:N - Once an NFS-over-RDMA mount and transport session exist, the attacker can flood spurious replies during normal client-server communication without any additional victim or administrator action at exploit time.\nS:U - Impact is confined to excessive kernel memory allocation and denial of service within the NFS client\u0027s SUNRPC/xprtrdma transport; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The bug is unbounded receive-buffer allocation driven by an unsanitized wire credit field, not an out-of-bounds read, use-after-free, or other memory disclosure primitive that exposes kernel data to the attacker.\nI:N - Inflated credits only cause rpcrdma_post_recvs() to allocate and post extra rpcrdma_rep objects; there is no demonstrated memory corruption, arbitrary write, or control-flow hijack primitive.\nA:H - Each spurious reply can drive rpcrdma_rep_create() far past re_max_requests until allocation fails, enabling repeated remote kernel memory exhaustion, OOM conditions, and loss of NFS-over-RDMA service on the client."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:31.793Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/7cf332b3d82d73ffceedca6b4a120be074172021"
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          "url": "https://git.kernel.org/stable/c/41634242140173eabbf54f899f9c70b5c685e786"
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          "url": "https://git.kernel.org/stable/c/8be1bb378def94a5cb8f7527a191e476407118ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/469b22376ee73369711ecf2761bd122ef4195963"
        },
        {
          "url": "https://git.kernel.org/stable/c/33db78b1b24fc6a464ae08aa4d2538c5f883eb5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3a628aab2dc8f5fd7bff86ceaeae64de590e60a"
        }
      ],
      "title": "xprtrdma: Sanitize the reply credit grant after parsing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72465",
    "datePublished": "2026-08-15T05:57:08.767Z",
    "dateReserved": "2026-08-09T03:40:39.933Z",
    "dateUpdated": "2026-08-17T05:44:31.793Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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