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GHSA-QCCR-C782-7QRW

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:

RDMA/siw: Fix endpoint/socket association handling

Disassociating a socket from an endpoint via siw_socket_disassoc() may release the last reference on that endpoint and free it. Therefore, don't clear the endpoints socket pointer after calling that function, but within.

This fixes a:

BUG: KASAN: slab-use-after-free in siw_cm_work_handler (drivers/infiniband/sw/siw/siw_cm.c:1053 drivers/infiniband/sw/siw/siw_cm.c:1075)

which occurred after processing a malformed MPA request during connection establishment, causing the new endpoint to be closed.

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74345"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:35Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Fix endpoint/socket association handling\n\nDisassociating a socket from an endpoint via siw_socket_disassoc() may\nrelease the last reference on that endpoint and free it. Therefore, don\u0027t\nclear the endpoints socket pointer after calling that function, but\nwithin.\n\nThis fixes a:\n\n  BUG: KASAN: slab-use-after-free in siw_cm_work_handler (drivers/infiniband/sw/siw/siw_cm.c:1053 drivers/infiniband/sw/siw/siw_cm.c:1075)\n\nwhich occurred after processing a malformed MPA request during connection\nestablishment, causing the new endpoint to be closed.",
  "id": "GHSA-qccr-c782-7qrw",
  "modified": "2026-08-17T06:33:40Z",
  "published": "2026-08-15T06:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74345"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b28d513393f81e2de00f82970487a9d001557e4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6cf763eee0a932792bef64ceaca568d324192fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea4f6f6c53577fb3f05dbd78b15e586772d49831"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6183983ce1ff254d629a333739082b39d7c5eb6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74345 (GCVE-0-2026-74345)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46

Title

RDMA/siw: Fix endpoint/socket association handling

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix endpoint/socket association handling Disassociating a socket from an endpoint via siw_socket_disassoc() may release the last reference on that endpoint and free it. Therefore, don't clear the endpoints socket pointer after calling that function, but within. This fixes a: BUG: KASAN: slab-use-after-free in siw_cm_work_handler (drivers/infiniband/sw/siw/siw_cm.c:1053 drivers/infiniband/sw/siw/siw_cm.c:1075) which occurred after processing a malformed MPA request during connection establishment, causing the new endpoint to be closed.

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b28d513393f81e2de…
https://git.kernel.org/stable/c/f6183983ce1ff254d…
https://git.kernel.org/stable/c/b6cf763eee0a93279…
https://git.kernel.org/stable/c/ea4f6f6c53577fb3f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6c52fdc244b5ccc468006fd65a504d4ee33743c7 , < b28d513393f81e2de00f82970487a9d001557e4e (git) Affected: 6c52fdc244b5ccc468006fd65a504d4ee33743c7 , < f6183983ce1ff254d629a333739082b39d7c5eb6 (git) Affected: 6c52fdc244b5ccc468006fd65a504d4ee33743c7 , < b6cf763eee0a932792bef64ceaca568d324192fc (git) Affected: 6c52fdc244b5ccc468006fd65a504d4ee33743c7 , < ea4f6f6c53577fb3f05dbd78b15e586772d49831 (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_cm.c"
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          "versions": [
            {
              "lessThan": "b28d513393f81e2de00f82970487a9d001557e4e",
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            },
            {
              "lessThan": "f6183983ce1ff254d629a333739082b39d7c5eb6",
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              "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
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              "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:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "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\nRDMA/siw: Fix endpoint/socket association handling\n\nDisassociating a socket from an endpoint via siw_socket_disassoc() may\nrelease the last reference on that endpoint and free it. Therefore, don\u0027t\nclear the endpoints socket pointer after calling that function, but\nwithin.\n\nThis fixes a:\n\n  BUG: KASAN: slab-use-after-free in siw_cm_work_handler (drivers/infiniband/sw/siw/siw_cm.c:1053 drivers/infiniband/sw/siw/siw_cm.c:1075)\n\nwhich occurred after processing a malformed MPA request during connection\nestablishment, causing the new endpoint to be closed."
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      "metrics": [
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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is hit while processing attacker-supplied MPA/TCP data on an inbound SIW listener socket during connection establishment, which is a standard network protocol path analogous to other in-kernel TCP service handlers.\nAC:L - An attacker fully controls the TCP connection and malformed MPA request bytes that deterministically fail parsing and drive the endpoint teardown path where the refcount bug frees the cep before it is accessed again.\nPR:N - Exploitation requires only the ability to open a TCP connection to a host running an SIW RDMA listener; the MPA handshake is unauthenticated and occurs before any RDMA credentials or local privileges are established.\nUI:N - No end-user action is required at exploit time; the kernel processes the malicious inbound connection automatically once an administrator has started an RDMA listener service.\nS:U - Impact is confined to kernel memory corruption and potential host privilege escalation within the same kernel security authority, not a VM escape or cross-authority boundary such as guest-to-hypervisor.\nC:H - The vulnerability is a slab use-after-free on a freed siw_cep object; UAF on attacker-influenced connection teardown enables heap grooming and arbitrary kernel memory read primitives beyond a simple crash.\nI:H - Use-after-free of the connection endpoint structure in kernel heap can be leveraged for controlled writes and code execution via object reuse and function pointer/callback corruption, not merely data integrity of a single field.\nA:H - The bug was reproduced as a KASAN slab-use-after-free in siw_cm_work_handler during malformed MPA processing, which can cause kernel oops/panic and denial of service on the target host."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-17T05:46:10.583Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/ea4f6f6c53577fb3f05dbd78b15e586772d49831"
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      ],
      "title": "RDMA/siw: Fix endpoint/socket association handling",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74345",
    "datePublished": "2026-08-15T05:58:33.906Z",
    "dateReserved": "2026-08-15T05:44:03.886Z",
    "dateUpdated": "2026-08-17T05:46:10.583Z",
    "state": "PUBLISHED"
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}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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