CVE-2025-40061 (GCVE-0-2025-40061)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2026-08-05 12:07
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix race in do_task() when draining When do_task() exhausts its iteration budget (!ret), it sets the state to TASK_STATE_IDLE to reschedule, without a secondary check on the current task->state. This can overwrite the TASK_STATE_DRAINING state set by a concurrent call to rxe_cleanup_task() or rxe_disable_task(). While state changes are protected by a spinlock, both rxe_cleanup_task() and rxe_disable_task() release the lock while waiting for the task to finish draining in the while(!is_done(task)) loop. The race occurs if do_task() hits its iteration limit and acquires the lock in this window. The cleanup logic may then proceed while the task incorrectly reschedules itself, leading to a potential use-after-free. This bug was introduced during the migration from tasklets to workqueues, where the special handling for the draining case was lost. Fix this by restoring the original pre-migration behavior. If the state is TASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to force a new loop iteration. This allows the task to finish its work, so that a subsequent iteration can reach the switch statement and correctly transition the state to TASK_STATE_DRAINED, stopping the task as intended.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9b4b7c1f9f54120940e243251e2b1407767b3381
Version: 9b4b7c1f9f54120940e243251e2b1407767b3381
Version: 9b4b7c1f9f54120940e243251e2b1407767b3381
Version: 9b4b7c1f9f54120940e243251e2b1407767b3381
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_task.c"
          ],
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          "vendor": "Linux",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_task.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.5"
            },
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              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.112",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.17.3",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix race in do_task() when draining\n\nWhen do_task() exhausts its iteration budget (!ret), it sets the state\nto TASK_STATE_IDLE to reschedule, without a secondary check on the\ncurrent task-\u003estate. This can overwrite the TASK_STATE_DRAINING state\nset by a concurrent call to rxe_cleanup_task() or rxe_disable_task().\n\nWhile state changes are protected by a spinlock, both rxe_cleanup_task()\nand rxe_disable_task() release the lock while waiting for the task to\nfinish draining in the while(!is_done(task)) loop. The race occurs if\ndo_task() hits its iteration limit and acquires the lock in this window.\nThe cleanup logic may then proceed while the task incorrectly\nreschedules itself, leading to a potential use-after-free.\n\nThis bug was introduced during the migration from tasklets to workqueues,\nwhere the special handling for the draining case was lost.\n\nFix this by restoring the original pre-migration behavior. If the state is\nTASK_STATE_DRAINING when iterations are exhausted, set cont to 1 to\nforce a new loop iteration. This allows the task to finish its work, so\nthat a subsequent iteration can reach the switch statement and correctly\ntransition the state to TASK_STATE_DRAINED, stopping the task as intended."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Both sides of the race are driven through local verbs calls on /dev/infiniband/uverbsN \u2014 posting work requests to exhaust the 1024-iteration budget and concurrently issuing modify_qp(RESET)/destroy_qp. Remote RoCE packets can feed the responder task, but the draining half (rxe_disable_task/rxe_cleanup_task) is only reachable from a local ioctl/write on the uverbs device.\nAC:L - The attacker controls both racers: one thread posts more than RXE_MAX_ITERATIONS work items so do_task deterministically hits the `!ret` branch, while another thread calls modify_qp(RESET) or destroy_qp to set TASK_STATE_DRAINING. The window can be retried unboundedly across many QPs and widened with CPU contention, so no condition lies outside the attacker\u0027s influence.\nPR:L - The kernel\u0027s uverbs_devnode() publishes /dev/infiniband/uverbsN with mode 0666, so any unprivileged local account can allocate a PD/CQ/QP and drive the race with no capabilities. Only the one-time creation of the rdma_rxe link requires CAP_NET_ADMIN, which is administrator setup rather than a privilege the attacker must hold.\nUI:N - The attacker performs every step itself from its own process; no victim action, mount, or file open is involved.\nS:U - The corruption is confined to kernel objects owned by the same kernel security authority (rxe QP, queues, CQs, MRs); no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Clobbering DRAINING lets a work item run rxe_responder/rxe_requester against a QP whose send/receive queues have been vfree\u0027d or memset and whose MRs and CQs have been put, giving use-after-free reads of freed kernel memory that are copied into userspace-mapped completion queues and onto the wire.\nI:H - The same use-after-free is a write primitive: the re-scheduled responder writes CQ entries, WQE state, and RDMA payloads into freed queue and MR memory, and duplicated rxe_put() calls underflow object refcounts, enabling heap grooming toward control-flow hijack.\nA:H - The race trips WARN_ON(task-\u003enum_done != task-\u003enum_sched) and dereferences freed rxe_queue, CQ, MR, and socket objects, reliably producing an oops or panic and taking down the machine."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:27.040Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/85288bcf7ffe11e7b036edf91937bc62fd384076"
        },
        {
          "url": "https://git.kernel.org/stable/c/52edccfb555142678c836c285bf5b4ec760bd043"
        },
        {
          "url": "https://git.kernel.org/stable/c/660b6959c4170637f5db2279d1f71af33a49e49b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ca7eada62fcfabf6ec1dc7468941e791c1d8729"
        }
      ],
      "title": "RDMA/rxe: Fix race in do_task() when draining",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40061",
    "datePublished": "2025-10-28T11:48:33.361Z",
    "dateReserved": "2025-04-16T07:20:57.158Z",
    "dateUpdated": "2026-08-05T12:07:27.040Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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