CVE-2025-40061 (GCVE-0-2025-40061)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-08-05 12:07
VLAI
Title
RDMA/rxe: Fix race in do_task() when draining
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9b4b7c1f9f54120940e243251e2b1407767b3381 , < 85288bcf7ffe11e7b036edf91937bc62fd384076 (git)
Affected: 9b4b7c1f9f54120940e243251e2b1407767b3381 , < 52edccfb555142678c836c285bf5b4ec760bd043 (git)
Affected: 9b4b7c1f9f54120940e243251e2b1407767b3381 , < 660b6959c4170637f5db2279d1f71af33a49e49b (git)
Affected: 9b4b7c1f9f54120940e243251e2b1407767b3381 , < 8ca7eada62fcfabf6ec1dc7468941e791c1d8729 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_task.c"
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              "negate": false,
              "operator": "OR"
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          "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": [
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            "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"
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              "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."
            }
          ]
        }
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/8ca7eada62fcfabf6ec1dc7468941e791c1d8729"
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      "title": "RDMA/rxe: Fix race in do_task() when draining",
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    "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"
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        "descriptions": [
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            "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."
          }
        ],
        "id": "CVE-2025-40061",
        "lastModified": "2026-07-30T06:24:08.850",
        "metrics": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2025-10-28T12:15:40.493",
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        "vulnStatus": "Deferred"
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    "redhat_vex": {
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      "current_release_date": "2026-07-30T08:53:02+00:00",
      "cve": "CVE-2025-40061",
      "id": "CVE-2025-40061",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/rxe: Fix race in do_task() when draining",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40061.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:56:05Z",
      "cve": "CVE-2025-40061",
      "id": "CVE-2025-40061",
      "initial_release_date": "2025-10-29T00:25:02Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "461",
      "product_status:known_not_affected": "323",
      "product_status:recommended": "470",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40061",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40061.json",
      "version": "53"
    }
  }
}



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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.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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