CVE-2026-99212 (GCVE-0-2026-99212)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:36 – Updated: 2026-10-31 12:45
VLAI
Title
net/rds: don't let the rdma_cm destroy an id RDS still owns on route failure
Summary
In the Linux kernel, the following vulnerability has been resolved: net/rds: don't let the rdma_cm destroy an id RDS still owns on route failure rds_rdma_cm_event_handler_cmn() hands the return value of rdma_resolve_route() straight back to the rdma_cm on RDMA_CM_EVENT_ADDR_RESOLVED. A synchronous failure there - -ENOMEM from the route work allocation, an SA query that cannot be set up, a RoCE route with no usable device - makes addr_handler() destroy the id the event was delivered on. That id is ic->i_cm_id, and nothing clears the pointer: the connection sits in RDS_CONN_CONNECTING with a freed id until its shutdown calls rdma_disconnect() and rdma_destroy_id() on it. The ROUTE_RESOLVED case already avoids this: rds_ib_cm_initiate_connect() forces a zero return while ic->i_cm_id == cm_id, as the comment there explains. Do the same here - drop the connection and return 0 - so the id stays RDS's to destroy from the shutdown, and the reconnect gets a fresh one.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < 664fd3205cbec71ac52c005ee705cd917bb6fb1a (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < b8f141f65885810e24fc23b8a71692db62d535bf (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < e677eda15df7d5ce256654343418043c7ffd6f9b (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < 92143c5d80382588d5a3047a4f14023ee9ef6485 (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < a7c7d0ff876377fea7ae876a28d6df8d9349df57 (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < 91ece3efa064f0b3b3c67b9b045d9eeb4a034e43 (git)
Affected: 55b7ed0b582f9ff4bf3b9b44969cddda8c6763ea , < 98d446b7c013254a8a7b49720557676a3a851fde (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: don\u0027t let the rdma_cm destroy an id RDS still owns on route failure\n\nrds_rdma_cm_event_handler_cmn() hands the return value of\nrdma_resolve_route() straight back to the rdma_cm on\nRDMA_CM_EVENT_ADDR_RESOLVED.  A synchronous failure there - -ENOMEM\nfrom the route work allocation, an SA query that cannot be set up, a\nRoCE route with no usable device - makes addr_handler() destroy the\nid the event was delivered on.  That id is ic-\u003ei_cm_id, and nothing\nclears the pointer: the connection sits in RDS_CONN_CONNECTING with a\nfreed id until its shutdown calls rdma_disconnect() and\nrdma_destroy_id() on it.\n\nThe ROUTE_RESOLVED case already avoids this: rds_ib_cm_initiate_connect()\nforces a zero return while ic-\u003ei_cm_id == cm_id, as the comment there\nexplains.  Do the same here - drop the connection and return 0 - so\nthe id stays RDS\u0027s to destroy from the shutdown, and the reconnect\ngets a fresh one."
        }
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              "value": "AV:L - An unprivileged process reaches patched rds_rdma_cm_event_handler_cmn() through AF_RDS sendmsg() \u2192 rds_connect_worker() \u2192 rds_ib_conn_path_connect() \u2192 addr_handler(). The failure occurs in local rdma_resolve_route() setup before any RDS message reaches a peer; no remote protocol message carries the trigger.\nAC:H - The synchronous error requires cma_resolve_ib_route() allocation/SA setup failure or cma_resolve_iboe_route() finding no usable netdevice or MTU. Choosing an RDS destination cannot reliably create those allocator, fabric-manager, or device states; an ordinary unreachable peer instead fails outside this ownership-error path.\nPR:L - rds_create(), rds_bind(), and rds_sendmsg() contain no capability check, and rds_ib_laddr_check() requires init_net but not root. Thus an ordinary host user can bind a configured IB/RoCE address and initiate the affected connection.\nUI:N - The attacker performs the AF_RDS sendmsg() themselves and can subsequently use RDS_CMSG_RDMA_MAP to reach __rds_rdma_map() \u2192 rds_ib_get_mr(), which dereferences the stale ic-\u003ei_cm_id. No victim action is required.\nS:U - The freed rdma_id_private and subsequent stale-pointer operations remain within the host kernel\u0027s RDS/RDMA security authority; no VM, IOMMU, or other distinct boundary is crossed.\nC:H - addr_handler() frees rdma_id_private while ic-\u003ei_cm_id retains its address, and rds_ib_get_mr() later reads qp from that reclaimed object. This kernel heap UAF permits controlled slab reuse and can be leveraged for arbitrary memory disclosure.\nI:H - If the reclaimed i_cm_id supplies a non-NULL qp, rds_ib_post_reg_frmr() passes it to ib_post_send(), reaching device operations through freed data; shutdown also calls rdma_disconnect() and rdma_destroy_id() on the stale ID. These provide control-flow and double-free corruption primitives.\nA:H - rds_ib_get_mr() can oops while reading ic-\u003ei_cm_id-\u003eqp, while rds_ib_conn_path_shutdown() later disconnects and destroys the already-freed ID. Either UAF path can panic the kernel."
            }
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    "datePublished": "2026-10-28T10:36:05.612Z",
    "dateReserved": "2026-09-25T10:25:14.401Z",
    "dateUpdated": "2026-10-31T12:45:05.538Z",
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      "title": "net/rds: don\u0027t let the rdma_cm destroy an id RDS still owns on route failure",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: don\u0027t let the rdma_cm destroy an id RDS still owns on route failure\n\nrds_rdma_cm_event_handler_cmn() hands the return value of\nrdma_resolve_route() straight back to the rdma_cm on\nRDMA_CM_EVENT_ADDR_RESOLVED.  A synchronous failure there - -ENOMEM\nfrom the route work allocation, an SA query that cannot be set up, a\nRoCE route with no usable device - makes addr_handler() destroy the\nid the event was delivered on.  That id is ic-\u003ei_cm_id, and nothing\nclears the pointer: the connection sits in RDS_CONN_CONNECTING with a\nfreed id until its shutdown calls rdma_disconnect() and\nrdma_destroy_id() on it.\n\nThe ROUTE_RESOLVED case already avoids this: rds_ib_cm_initiate_connect()\nforces a zero return while ic-\u003ei_cm_id == cm_id, as the comment there\nexplains.  Do the same here - drop the connection and return 0 - so\nthe id stays RDS\u0027s to destroy from the shutdown, and the reconnect\ngets a fresh one."
          }
        ],
        "id": "CVE-2026-99212",
        "lastModified": "2026-10-31T13:17:59.453",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-10-28T11:17:42.650",
        "references": [
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-31T15:46:09+00:00",
      "cve": "CVE-2026-99212",
      "id": "CVE-2026-99212",
      "initial_release_date": "2026-10-28T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "265",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/rds: don\u0027t let the rdma_cm destroy an id RDS still owns on route failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99212.json",
      "version": "3"
    }
  }
}



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Sightings

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