CVE-2026-43469 (GCVE-0-2026-43469)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-08-05 12:28
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Decrement re_receiving on the early exit paths In the event that rpcrdma_post_recvs() fails to create a work request (due to memory allocation failure, say) or otherwise exits early, we should decrement ep->re_receiving before returning. Otherwise we will hang in rpcrdma_xprt_drain() as re_receiving will never reach zero and the completion will never be triggered. On a system with high memory pressure, this can appear as the following hung task: INFO: task kworker/u385:17:8393 blocked for more than 122 seconds. Tainted: G S E 6.19.0 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u385:17 state:D stack:0 pid:8393 tgid:8393 ppid:2 task_flags:0x4248060 flags:0x00080000 Workqueue: xprtiod xprt_autoclose [sunrpc] Call Trace: <TASK> __schedule+0x48b/0x18b0 ? ib_post_send_mad+0x247/0xae0 [ib_core] schedule+0x27/0xf0 schedule_timeout+0x104/0x110 __wait_for_common+0x98/0x180 ? __pfx_schedule_timeout+0x10/0x10 wait_for_completion+0x24/0x40 rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma] xprt_rdma_close+0x12/0x40 [rpcrdma] xprt_autoclose+0x5f/0x120 [sunrpc] process_one_work+0x191/0x3e0 worker_thread+0x2e3/0x420 ? __pfx_worker_thread+0x10/0x10 kthread+0x10d/0x230 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x273/0x2b0 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30
References
Impacted products
Vendor Product Version
Linux Linux Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
Version: 15788d1d1077ebe029c48842c738876516d85076
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtrdma/verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7ea69259a60a364f56cf4aa9e2eafb588d1c762b",
              "status": "affected",
              "version": "15788d1d1077ebe029c48842c738876516d85076",
              "versionType": "git"
            },
            {
              "lessThan": "8cb6b5d8296b1f99a8d36849901ebabfe3f749db",
              "status": "affected",
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              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
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              "status": "affected",
              "version": "15788d1d1077ebe029c48842c738876516d85076",
              "versionType": "git"
            },
            {
              "lessThan": "7b6275c80a0c81c5f8943272292dfe67730ce849",
              "status": "affected",
              "version": "15788d1d1077ebe029c48842c738876516d85076",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtrdma/verbs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
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                  "versionEndExcluding": "6.12.78",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.19",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Decrement re_receiving on the early exit paths\n\nIn the event that rpcrdma_post_recvs() fails to create a work request\n(due to memory allocation failure, say) or otherwise exits early, we\nshould decrement ep-\u003ere_receiving before returning. Otherwise we will\nhang in rpcrdma_xprt_drain() as re_receiving will never reach zero and\nthe completion will never be triggered.\n\nOn a system with high memory pressure, this can appear as the following\nhung task:\n\n    INFO: task kworker/u385:17:8393 blocked for more than 122 seconds.\n          Tainted: G S          E       6.19.0 #3\n    \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n    task:kworker/u385:17 state:D stack:0     pid:8393  tgid:8393  ppid:2      task_flags:0x4248060 flags:0x00080000\n    Workqueue: xprtiod xprt_autoclose [sunrpc]\n    Call Trace:\n     \u003cTASK\u003e\n     __schedule+0x48b/0x18b0\n     ? ib_post_send_mad+0x247/0xae0 [ib_core]\n     schedule+0x27/0xf0\n     schedule_timeout+0x104/0x110\n     __wait_for_common+0x98/0x180\n     ? __pfx_schedule_timeout+0x10/0x10\n     wait_for_completion+0x24/0x40\n     rpcrdma_xprt_disconnect+0x444/0x460 [rpcrdma]\n     xprt_rdma_close+0x12/0x40 [rpcrdma]\n     xprt_autoclose+0x5f/0x120 [sunrpc]\n     process_one_work+0x191/0x3e0\n     worker_thread+0x2e3/0x420\n     ? __pfx_worker_thread+0x10/0x10\n     kthread+0x10d/0x230\n     ? __pfx_kthread+0x10/0x10\n     ret_from_fork+0x273/0x2b0\n     ? __pfx_kthread+0x10/0x10\n     ret_from_fork_asm+0x1a/0x30"
        }
      ],
      "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 vulnerable function is reached from the RPC-over-RDMA client receive completion path while processing network-delivered RDMA replies from an NFS/RDMA peer. A malicious or compromised remote NFS/RDMA server can influence the receive repost path via reply traffic and credit grants.\nAC:L - The trigger is a deterministic accounting bug on early exits from receive reposting, and a peer can drive reply bursts, high credit grants, and disconnect/reconnect behavior to reach the path. Although memory pressure can help expose one early exit, the rule requires choosing the higher severity option when uncertain.\nPR:N - The remote peer sending RDMA replies does not need privileges on the affected client. The client must already be using an NFS/RDMA transport, but the attacker-side protocol traffic itself is not gated by local kernel privileges.\nUI:N - In a reasonable deployed scenario, the client already has an active NFS/RDMA mount and normal RPC traffic reaches the vulnerable receive path without a further victim action. Exploitation can be driven by the remote peer during ordinary mounted filesystem operation.\nS:U - The effect is confined to the Linux kernel/RPC transport on the same host. It does not cross a separate security authority such as a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a leaked receive-drain accounting reference, not memory corruption or an information disclosure primitive. The investigated paths indicate a hang in disconnect/drain handling rather than exposure of kernel memory.\nI:N - The issue does not provide data modification, arbitrary write, or control-flow manipulation. It only prevents receive-drain completion after the counter is left elevated.\nA:H - The leaked re_receiving count can make rpcrdma_xprt_drain wait forever, producing stuck xprtiod/autoclose work and hung kernel tasks. This is a kernel-level availability failure for the affected NFS/RDMA transport and can persist until recovery or reboot."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:28:10.739Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7ea69259a60a364f56cf4aa9e2eafb588d1c762b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8cb6b5d8296b1f99a8d36849901ebabfe3f749db"
        },
        {
          "url": "https://git.kernel.org/stable/c/74c39a47856bddcde7874f2196a00143b5cd0af9"
        },
        {
          "url": "https://git.kernel.org/stable/c/49f53ee4e25297d886f14e31f355ad1c2735ddfb"
        },
        {
          "url": "https://git.kernel.org/stable/c/8127b5fec04757c2a41ed65bca0b3266968efd3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc3ebd7e2d73dbd4d317785735ffa6c4a6384ddf"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b6275c80a0c81c5f8943272292dfe67730ce849"
        }
      ],
      "title": "xprtrdma: Decrement re_receiving on the early exit paths",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43469",
    "datePublished": "2026-05-08T14:22:29.550Z",
    "dateReserved": "2026-05-01T14:12:56.011Z",
    "dateUpdated": "2026-08-05T12:28:10.739Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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