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CVE-2026-72342 (GCVE-0-2026-72342)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:43
VLAI
Title
net/mlx5e: Fix HV VHCA stats agent registration race
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix HV VHCA stats agent registration race mlx5e_hv_vhca_stats_create() registers the stats agent through mlx5_hv_vhca_agent_create(). The helper publishes the agent in hv_vhca->agents[type] under agents_lock and immediately schedules an asynchronous control invalidation on the HV VHCA workqueue before returning to mlx5e. The asynchronous invalidation invokes the control agent's invalidate callback, which reads the hypervisor control block and forwards the command to mlx5e_hv_vhca_stats_control(). That callback may either: - call cancel_delayed_work_sync(&priv->stats_agent.work), or - call queue_delayed_work(priv->wq, &sagent->work, sagent->delay). However, the delayed_work and priv->stats_agent.agent are only initialized after mlx5_hv_vhca_agent_create() returns to mlx5e: agent = mlx5_hv_vhca_agent_create(...); /* publish + invalidate */ ... priv->stats_agent.agent = agent; /* too late */ INIT_DELAYED_WORK(&priv->stats_agent.work, ...); /* too late */ If the asynchronous control path runs before the two assignments above, it can: - Operate on an uninitialized delayed_work whose timer.function is NULL. queue_delayed_work() calls add_timer() unconditionally, so when the timer expires the timer softirq invokes a NULL function pointer. - Re-initialize the timer later through INIT_DELAYED_WORK() while the timer is already enqueued in the timer wheel, corrupting the hlist (entry.pprev cleared while the previous bucket node still points at this entry). - When the worker eventually runs, mlx5e_hv_vhca_stats_work() reads sagent->agent (NULL) and dereferences it inside mlx5_hv_vhca_agent_write(). Fix this by: - Initializing priv->stats_agent.work before invoking mlx5_hv_vhca_agent_create(), so the work is always in a valid state when the control callback observes it. - Adding a struct mlx5_hv_vhca_agent **ctx_update out-parameter to mlx5_hv_vhca_agent_create(). The helper writes the agent pointer to *ctx_update before publishing into hv_vhca->agents[] and triggering the agents_update flow, so any callback subsequently invoked from that flow already sees a valid priv->stats_agent.agent. This avoids having the control callback participate in agent initialization. While at it, access priv->stats_agent.agent with READ_ONCE()/WRITE_ONCE() for the cross-CPU access with the worker, and clear priv->stats_agent.buf on the agent_create() failure path.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < b0fd6d3bb06182f19f3b59a53f57b5098b99048a (git)
Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < 24c77044cdfcf5b8b2e9f3b620d8b9aa392d9add (git)
Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < e8fc3304cb67fb1d7d11ff9ef9abd5fb64e7e1d5 (git)
Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < 60fddda7207d81fea71463abd403f0b10f74f2e1 (git)
Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < f5677797b094c3ec5fb350eb8ea7710b88a3d018 (git)
Affected: cef35af34d6dc3792333075115c7deb7062b6e18 , < 89b25b5f46f488ea3b29b3444864c76944c9075b (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c",
            "drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c",
            "drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h"
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            "drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix HV VHCA stats agent registration race\n\nmlx5e_hv_vhca_stats_create() registers the stats agent through\nmlx5_hv_vhca_agent_create(). The helper publishes the agent in\nhv_vhca-\u003eagents[type] under agents_lock and immediately schedules an\nasynchronous control invalidation on the HV VHCA workqueue before\nreturning to mlx5e.\n\nThe asynchronous invalidation invokes the control agent\u0027s invalidate\ncallback, which reads the hypervisor control block and forwards the\ncommand to mlx5e_hv_vhca_stats_control(). That callback may either:\n\n  - call cancel_delayed_work_sync(\u0026priv-\u003estats_agent.work), or\n  - call queue_delayed_work(priv-\u003ewq, \u0026sagent-\u003ework, sagent-\u003edelay).\n\nHowever, the delayed_work and priv-\u003estats_agent.agent are only\ninitialized after mlx5_hv_vhca_agent_create() returns to mlx5e:\n\n    agent = mlx5_hv_vhca_agent_create(...);   /* publish + invalidate */\n    ...\n    priv-\u003estats_agent.agent = agent;          /* too late */\n    INIT_DELAYED_WORK(\u0026priv-\u003estats_agent.work, ...); /* too late */\n\nIf the asynchronous control path runs before the two assignments\nabove, it can:\n\n  - Operate on an uninitialized delayed_work whose timer.function is\n    NULL. queue_delayed_work() calls add_timer() unconditionally, so\n    when the timer expires the timer softirq invokes a NULL function\n    pointer.\n  - Re-initialize the timer later through INIT_DELAYED_WORK() while\n    the timer is already enqueued in the timer wheel, corrupting the\n    hlist (entry.pprev cleared while the previous bucket node still\n    points at this entry).\n  - When the worker eventually runs, mlx5e_hv_vhca_stats_work() reads\n    sagent-\u003eagent (NULL) and dereferences it inside\n    mlx5_hv_vhca_agent_write().\n\nFix this by:\n\n  - Initializing priv-\u003estats_agent.work before invoking\n    mlx5_hv_vhca_agent_create(), so the work is always in a valid\n    state when the control callback observes it.\n  - Adding a struct mlx5_hv_vhca_agent **ctx_update out-parameter\n    to mlx5_hv_vhca_agent_create(). The helper writes the agent\n    pointer to *ctx_update before publishing into hv_vhca-\u003eagents[]\n    and triggering the agents_update flow, so any callback\n    subsequently invoked from that flow already sees a valid\n    priv-\u003estats_agent.agent. This avoids having the control\n    callback participate in agent initialization.\n\nWhile at it, access priv-\u003estats_agent.agent with\nREAD_ONCE()/WRITE_ONCE() for the cross-CPU access with the worker, and\nclear priv-\u003estats_agent.buf on the agent_create() failure path."
        }
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              "lang": "en",
              "value": "AV:L - The bug is in mlx5e HV VHCA stats agent registration during mlx5e driver attach on Hyper-V/Azure mlx5 NICs; it is reached via the VMBus PCI config back-channel and driver init, not via remote network packet handling.\nAC:L - mlx5_hv_vhca_agent_create() always queues asynchronous control invalidation before returning; on SMP hosts the workqueue races unfinished delayed_work/agent setup, and the path can be re-triggered via devlink reload or driver reattach.\nPR:N - No guest privileges are required: the race opens during normal mlx5e attach at boot/resume on CONFIG_PCI_HYPERV_INTERFACE systems, and the hypervisor can drive the control callback via the VHCA control block without guest credentials.\nUI:N - No user or administrator action is needed beyond normal VM boot and mlx5 driver initialization; exploitation does not depend on a victim opening files, mounting filesystems, or other interactive steps.\nS:U - Memory corruption and kernel crashes are confined to the guest kernel running mlx5e; the bug does not cross VM/host, IOMMU, or other security boundaries into a separate authority.\nC:H - The race can corrupt the kernel timer wheel hlist, invoke a NULL timer callback, or dereference a NULL agent during mlx5_hv_vhca_agent_write(), providing serious kernel memory corruption or disclosure primitives.\nI:H - Timer wheel hlist corruption and operating on uninitialized delayed_work structures are exploitable memory corruption that can be leveraged for arbitrary kernel writes or control-flow hijacking, not merely a bounded fault.\nA:H - Exploitation causes kernel oops/panic from NULL function-pointer timer callbacks, corrupted timer lists, or NULL agent dereferences, reliably denying availability of the affected system."
            }
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        }
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        "dateUpdated": "2026-08-17T05:43:00.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/24c77044cdfcf5b8b2e9f3b620d8b9aa392d9add"
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        },
        {
          "url": "https://git.kernel.org/stable/c/60fddda7207d81fea71463abd403f0b10f74f2e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5677797b094c3ec5fb350eb8ea7710b88a3d018"
        },
        {
          "url": "https://git.kernel.org/stable/c/89b25b5f46f488ea3b29b3444864c76944c9075b"
        }
      ],
      "title": "net/mlx5e: Fix HV VHCA stats agent registration race",
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    "cveId": "CVE-2026-72342",
    "datePublished": "2026-08-15T05:55:48.412Z",
    "dateReserved": "2026-08-09T03:40:39.920Z",
    "dateUpdated": "2026-08-17T05:43:00.745Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72342\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:07.520\",\"lastModified\":\"2026-08-17T06:18:38.010\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/mlx5e: Fix HV VHCA stats agent registration race\\n\\nmlx5e_hv_vhca_stats_create() registers the stats agent through\\nmlx5_hv_vhca_agent_create(). The helper publishes the agent in\\nhv_vhca-\u003eagents[type] under agents_lock and immediately schedules an\\nasynchronous control invalidation on the HV VHCA workqueue before\\nreturning to mlx5e.\\n\\nThe asynchronous invalidation invokes the control agent\u0027s invalidate\\ncallback, which reads the hypervisor control block and forwards the\\ncommand to mlx5e_hv_vhca_stats_control(). That callback may either:\\n\\n  - call cancel_delayed_work_sync(\u0026priv-\u003estats_agent.work), or\\n  - call queue_delayed_work(priv-\u003ewq, \u0026sagent-\u003ework, sagent-\u003edelay).\\n\\nHowever, the delayed_work and priv-\u003estats_agent.agent are only\\ninitialized after mlx5_hv_vhca_agent_create() returns to mlx5e:\\n\\n    agent = mlx5_hv_vhca_agent_create(...);   /* publish + invalidate */\\n    ...\\n    priv-\u003estats_agent.agent = agent;          /* too late */\\n    INIT_DELAYED_WORK(\u0026priv-\u003estats_agent.work, ...); /* too late */\\n\\nIf the asynchronous control path runs before the two assignments\\nabove, it can:\\n\\n  - Operate on an uninitialized delayed_work whose timer.function is\\n    NULL. queue_delayed_work() calls add_timer() unconditionally, so\\n    when the timer expires the timer softirq invokes a NULL function\\n    pointer.\\n  - Re-initialize the timer later through INIT_DELAYED_WORK() while\\n    the timer is already enqueued in the timer wheel, corrupting the\\n    hlist (entry.pprev cleared while the previous bucket node still\\n    points at this entry).\\n  - When the worker eventually runs, mlx5e_hv_vhca_stats_work() reads\\n    sagent-\u003eagent (NULL) and dereferences it inside\\n    mlx5_hv_vhca_agent_write().\\n\\nFix this by:\\n\\n  - Initializing priv-\u003estats_agent.work before invoking\\n    mlx5_hv_vhca_agent_create(), so the work is always in a valid\\n    state when the control callback observes it.\\n  - Adding a struct mlx5_hv_vhca_agent **ctx_update out-parameter\\n    to mlx5_hv_vhca_agent_create(). The helper writes the agent\\n    pointer to *ctx_update before publishing into hv_vhca-\u003eagents[]\\n    and triggering the agents_update flow, so any callback\\n    subsequently invoked from that flow already sees a valid\\n    priv-\u003estats_agent.agent. This avoids having the control\\n    callback participate in agent initialization.\\n\\nWhile at it, access priv-\u003estats_agent.agent with\\nREAD_ONCE()/WRITE_ONCE() for the cross-CPU access with the worker, and\\nclear priv-\u003estats_agent.buf on the agent_create() failure path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c\",\"drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c\",\"drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"b0fd6d3bb06182f19f3b59a53f57b5098b99048a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"24c77044cdfcf5b8b2e9f3b620d8b9aa392d9add\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"e8fc3304cb67fb1d7d11ff9ef9abd5fb64e7e1d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"60fddda7207d81fea71463abd403f0b10f74f2e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"f5677797b094c3ec5fb350eb8ea7710b88a3d018\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cef35af34d6dc3792333075115c7deb7062b6e18\",\"lessThan\":\"89b25b5f46f488ea3b29b3444864c76944c9075b\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c\",\"drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c\",\"drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24c77044cdfcf5b8b2e9f3b620d8b9aa392d9add\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60fddda7207d81fea71463abd403f0b10f74f2e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89b25b5f46f488ea3b29b3444864c76944c9075b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0fd6d3bb06182f19f3b59a53f57b5098b99048a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8fc3304cb67fb1d7d11ff9ef9abd5fb64e7e1d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5677797b094c3ec5fb350eb8ea7710b88a3d018\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T19:39:05+00:00",
      "cve": "CVE-2026-72342",
      "id": "CVE-2026-72342",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "228",
      "product_status:known_not_affected": "46",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: Fix HV VHCA stats agent registration race",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72342.json",
      "version": "3"
    }
  }
}



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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.

Sightings

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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.


Detection rules are retrieved from Rulezet.