CVE-2026-98257 (GCVE-0-2026-98257)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-07 06:49
VLAI
Title
rds: ib: use rds_conn_drop() on protocol version mismatch
Summary
In the Linux kernel, the following vulnerability has been resolved: rds: ib: use rds_conn_drop() on protocol version mismatch rds_ib_cm_connect_complete() runs from the RDMA-CM event handler with conn->c_cm_lock held. When the peer negotiates a protocol version older than RDS_PROTOCOL_COMPAT_VERSION, the handler calls rds_conn_destroy(), which is only safe in the rmmod path: it synchronously tears the connection down and flush_work()es the shutdown work cp_down_w. That shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is the very lock the event handler still holds, so the flush never completes: the two workers wait on each other and the RDS connection workqueues stall for good. All other RDMA-CM failure paths (REJECTED, CONNECT_ERROR, DISCONNECTED) use rds_conn_drop(), which marks the connection RDS_CONN_ERROR and schedules the shutdown work asynchronously. Use it here as well.
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 54/100 over 6618 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < 424019be3f637da76b74f44a40034669acbb166f (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < 14fb90067d13f4494cff0f03243fae3cf2911cbc (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < 344c72a0bc2703a6de4918ed935850e07dae3af2 (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < b5c9f2951d330d4a198a64d6e60f79b4bd6ef078 (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < d392b16acd0908f077289aad8bba066ff16de336 (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < 65ca0a5037152a5a80b8fe6aac80eb80458be573 (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < 7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8 (git)
Affected: f147dd9ecabf23fd63d2562ffe64252a0453ecde , < f97d8c7bab7843631206a114986c9059da03efeb (git)
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Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: use rds_conn_drop() on protocol version mismatch\n\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn-\u003ec_cm_lock held.  When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\n\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\n\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously.  Use\nit here as well."
        }
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      "metrics": [
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            "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 bad input is dp_protocol_major/minor in the peer\u0027s RDMA-CM REP private data, which rds_ib_cm_connect_complete() reads on RDMA_CM_EVENT_ESTABLISHED from rds_rdma_cm_event_handler_cmn(). RDS/IB runs over RoCEv2, whose CM messages travel over routable UDP/IP, so a remote peer supplies the version that hits the rds_conn_destroy() branch.\nAC:L - The attacker produces the active-side state: connect to the RDS listener, then disconnect. IB has no lower-address rule in rds_queue_reconnect(), so the hashed conn reconnects to the attacker, who replies with version 3.0. The deadlock then fires every time.\nPR:N - RDS/IB connection setup has no authentication. rds_ib_cm_handle_connect() only checks the protocol version from the request, and the REP private data the fix concerns is taken from the peer as-is.\nUI:N - No local user action is needed. The victim kernel\u0027s own reconnect worker (rds_connect_worker via rds_queue_reconnect) starts the outgoing connection after the attacker drops the first one.\nS:U - The impact is a deadlock inside the same kernel that processes the RDMA-CM event. No VM, IOMMU or sandbox boundary is crossed.\nC:N - rds_conn_destroy() blocks in flush_work(\u0026cp-\u003ecp_down_w) before it reaches kmem_cache_free(), so the conn is never freed and then used. No memory is disclosed.\nI:N - No memory is corrupted. The fault is a lock-ordering deadlock between the CM handler holding c_cm_lock and rds_conn_shutdown() waiting for it, not a write to freed or out-of-bounds memory.\nA:H - The RDMA-CM event worker blocks forever in flush_work() while holding c_cm_lock, and the RDS shutdown work blocks on mutex_lock(\u0026cp-\u003ecp_cm_lock). This stalls the RDS connection workqueues and CM event handling for good, and the attacker can repeat it against new connections."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:49:44.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/14fb90067d13f4494cff0f03243fae3cf2911cbc"
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        {
          "url": "https://git.kernel.org/stable/c/f97d8c7bab7843631206a114986c9059da03efeb"
        }
      ],
      "title": "rds: ib: use rds_conn_drop() on protocol version mismatch",
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98257",
    "datePublished": "2026-10-06T08:45:22.722Z",
    "dateReserved": "2026-09-25T10:25:14.332Z",
    "dateUpdated": "2026-10-07T06:49:44.498Z",
    "state": "PUBLISHED"
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: use rds_conn_drop() on protocol version mismatch\n\nrds_ib_cm_connect_complete() runs from the RDMA-CM event handler with\nconn-\u003ec_cm_lock held.  When the peer negotiates a protocol version\nolder than RDS_PROTOCOL_COMPAT_VERSION, the handler calls\nrds_conn_destroy(), which is only safe in the rmmod path: it\nsynchronously tears the connection down and flush_work()es the\nshutdown work cp_down_w.\n\nThat shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is\nthe very lock the event handler still holds, so the flush never\ncompletes: the two workers wait on each other and the RDS connection\nworkqueues stall for good.\n\nAll other RDMA-CM failure paths (REJECTED, CONNECT_ERROR,\nDISCONNECTED) use rds_conn_drop(), which marks the connection\nRDS_CONN_ERROR and schedules the shutdown work asynchronously.  Use\nit here as well."
          }
        ],
        "id": "CVE-2026-98257",
        "lastModified": "2026-10-07T07:17:06.973",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-06T09:18:14.540",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
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          },
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            "url": "https://git.kernel.org/stable/c/424019be3f637da76b74f44a40034669acbb166f"
          },
          {
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            "url": "https://git.kernel.org/stable/c/65ca0a5037152a5a80b8fe6aac80eb80458be573"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b5c9f2951d330d4a198a64d6e60f79b4bd6ef078"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-10T18:27:23+00:00",
      "cve": "CVE-2026-98257",
      "id": "CVE-2026-98257",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "263",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rds: ib: use rds_conn_drop() on protocol version mismatch",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98257.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-07T00:00:55Z",
      "cve": "CVE-2026-98257",
      "id": "CVE-2026-98257",
      "initial_release_date": "2026-10-07T00:00:55Z",
      "product_status:known_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98257",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98257.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.