Vulnerability-Lookup

FKIE_CVE-2026-23342

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-04-23 21:16

Severity ?

4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix race in cpumap on PREEMPT_RT On PREEMPT_RT kernels, the per-CPU xdp_bulk_queue (bq) can be accessed concurrently by multiple preemptible tasks on the same CPU. The original code assumes bq_enqueue() and __cpu_map_flush() run atomically with respect to each other on the same CPU, relying on local_bh_disable() to prevent preemption. However, on PREEMPT_RT, local_bh_disable() only calls migrate_disable() (when PREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable preemption, which allows CFS scheduling to preempt a task during bq_flush_to_queue(), enabling another task on the same CPU to enter bq_enqueue() and operate on the same per-CPU bq concurrently. This leads to several races: 1. Double __list_del_clearprev(): after bq->count is reset in bq_flush_to_queue(), a preempting task can call bq_enqueue() -> bq_flush_to_queue() on the same bq when bq->count reaches CPU_MAP_BULK_SIZE. Both tasks then call __list_del_clearprev() on the same bq->flush_node, the second call dereferences the prev pointer that was already set to NULL by the first. 2. bq->count and bq->q[] races: concurrent bq_enqueue() can corrupt the packet queue while bq_flush_to_queue() is processing it. The race between task A (__cpu_map_flush -> bq_flush_to_queue) and task B (bq_enqueue -> bq_flush_to_queue) on the same CPU: Task A (xdp_do_flush) Task B (cpu_map_enqueue) ---------------------- ------------------------ bq_flush_to_queue(bq) spin_lock(&q->producer_lock) /* flush bq->q[] to ptr_ring */ bq->count = 0 spin_unlock(&q->producer_lock) bq_enqueue(rcpu, xdpf) <-- CFS preempts Task A --> bq->q[bq->count++] = xdpf /* ... more enqueues until full ... */ bq_flush_to_queue(bq) spin_lock(&q->producer_lock) /* flush to ptr_ring */ spin_unlock(&q->producer_lock) __list_del_clearprev(flush_node) /* sets flush_node.prev = NULL */ <-- Task A resumes --> __list_del_clearprev(flush_node) flush_node.prev->next = ... /* prev is NULL -> kernel oops */ Fix this by adding a local_lock_t to xdp_bulk_queue and acquiring it in bq_enqueue() and __cpu_map_flush(). These paths already run under local_bh_disable(), so use local_lock_nested_bh() which on non-RT is a pure annotation with no overhead, and on PREEMPT_RT provides a per-CPU sleeping lock that serializes access to the bq. To reproduce, insert an mdelay(100) between bq->count = 0 and __list_del_clearprev() in bq_flush_to_queue(), then run reproducer provided by syzkaller.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7466ae2aeed483de80c5d8dea0913cf74038b652	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/869c63d5975d55e97f6b168e885452b3da20ea47	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e67299e1044349ad0088d52c6bc5764cc1816c06	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.18
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix race in cpumap on PREEMPT_RT\n\nOn PREEMPT_RT kernels, the per-CPU xdp_bulk_queue (bq) can be accessed\nconcurrently by multiple preemptible tasks on the same CPU.\n\nThe original code assumes bq_enqueue() and __cpu_map_flush() run\natomically with respect to each other on the same CPU, relying on\nlocal_bh_disable() to prevent preemption. However, on PREEMPT_RT,\nlocal_bh_disable() only calls migrate_disable() (when\nPREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable\npreemption, which allows CFS scheduling to preempt a task during\nbq_flush_to_queue(), enabling another task on the same CPU to enter\nbq_enqueue() and operate on the same per-CPU bq concurrently.\n\nThis leads to several races:\n\n1. Double __list_del_clearprev(): after bq-\u003ecount is reset in\n   bq_flush_to_queue(), a preempting task can call bq_enqueue() -\u003e\n   bq_flush_to_queue() on the same bq when bq-\u003ecount reaches\n   CPU_MAP_BULK_SIZE. Both tasks then call __list_del_clearprev()\n   on the same bq-\u003eflush_node, the second call dereferences the\n   prev pointer that was already set to NULL by the first.\n\n2. bq-\u003ecount and bq-\u003eq[] races: concurrent bq_enqueue() can corrupt\n   the packet queue while bq_flush_to_queue() is processing it.\n\nThe race between task A (__cpu_map_flush -\u003e bq_flush_to_queue) and\ntask B (bq_enqueue -\u003e bq_flush_to_queue) on the same CPU:\n\n  Task A (xdp_do_flush)          Task B (cpu_map_enqueue)\n  ----------------------         ------------------------\n  bq_flush_to_queue(bq)\n    spin_lock(\u0026q-\u003eproducer_lock)\n    /* flush bq-\u003eq[] to ptr_ring */\n    bq-\u003ecount = 0\n    spin_unlock(\u0026q-\u003eproducer_lock)\n                                   bq_enqueue(rcpu, xdpf)\n    \u003c-- CFS preempts Task A --\u003e      bq-\u003eq[bq-\u003ecount++] = xdpf\n                                     /* ... more enqueues until full ... */\n                                     bq_flush_to_queue(bq)\n                                       spin_lock(\u0026q-\u003eproducer_lock)\n                                       /* flush to ptr_ring */\n                                       spin_unlock(\u0026q-\u003eproducer_lock)\n                                       __list_del_clearprev(flush_node)\n                                         /* sets flush_node.prev = NULL */\n    \u003c-- Task A resumes --\u003e\n    __list_del_clearprev(flush_node)\n      flush_node.prev-\u003enext = ...\n      /* prev is NULL -\u003e kernel oops */\n\nFix this by adding a local_lock_t to xdp_bulk_queue and acquiring it\nin bq_enqueue() and __cpu_map_flush(). These paths already run under\nlocal_bh_disable(), so use local_lock_nested_bh() which on non-RT is\na pure annotation with no overhead, and on PREEMPT_RT provides a\nper-CPU sleeping lock that serializes access to the bq.\n\nTo reproduce, insert an mdelay(100) between bq-\u003ecount = 0 and\n__list_del_clearprev() in bq_flush_to_queue(), then run reproducer\nprovided by syzkaller."
    },
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Corrige condici\u00f3n de carrera en cpumap en PREEMPT_RT\n\nEn kernels PREEMPT_RT, la xdp_bulk_queue (bq) por CPU puede ser accedida concurrentemente por m\u00faltiples tareas preemptibles en la misma CPU.\n\nEl c\u00f3digo original asume que bq_enqueue() y __cpu_map_flush() se ejecutan at\u00f3micamente una con respecto a la otra en la misma CPU, confiando en local_bh_disable() para prevenir la preemption. Sin embargo, en PREEMPT_RT, local_bh_disable() solo llama a migrate_disable() (cuando PREEMPT_RT_NEEDS_BH_LOCK no est\u00e1 configurado) y no deshabilita la preemption, lo que permite que la planificaci\u00f3n CFS preempte una tarea durante bq_flush_to_queue(), permitiendo que otra tarea en la misma CPU entre en bq_enqueue() y opere en la misma bq por CPU concurrentemente.\n\nEsto conduce a varias condiciones de carrera:\n\n1. Doble __list_del_clearprev(): despu\u00e9s de que bq-\u0026gt;count se reinicia en bq_flush_to_queue(), una tarea preemptora puede llamar a bq_enqueue() -\u0026gt; bq_flush_to_queue() en la misma bq cuando bq-\u0026gt;count alcanza CPU_MAP_BULK_SIZE. Ambas tareas luego llaman a __list_del_clearprev() en el mismo bq-\u0026gt;flush_node, la segunda llamada desreferencia el puntero prev que ya hab\u00eda sido establecido a NULL por la primera.\n\n2. Condiciones de carrera de bq-\u0026gt;count y bq-\u0026gt;q[]: bq_enqueue() concurrente puede corromper la cola de paquetes mientras bq_flush_to_queue() la est\u00e1 procesando.\n\nLa condici\u00f3n de carrera entre la tarea A (__cpu_map_flush -\u0026gt; bq_flush_to_queue) y la tarea B (bq_enqueue -\u0026gt; bq_flush_to_queue) en la misma CPU:\n\n  Tarea A (xdp_do_flush)          Tarea B (cpu_map_enqueue)\n  ----------------------         ------------------------\n  bq_flush_to_queue(bq)\n    spin_lock(\u0026amp;q-\u0026gt;producer_lock)\n    /* vaciar bq-\u0026gt;q[] a ptr_ring */\n    bq-\u0026gt;count = 0\n    spin_unlock(\u0026amp;q-\u0026gt;producer_lock)\n                                   bq_enqueue(rcpu, xdpf)\n  \u0026lt;-- CFS preempte la Tarea A --\u0026gt;  bq-\u0026gt;q[bq-\u0026gt;count++] = xdpf\n                                     /* ... m\u00e1s encolamientos hasta llenarse ... */\n                                     bq_flush_to_queue(bq)\n                                       spin_lock(\u0026amp;q-\u0026gt;producer_lock)\n                                       /* vaciar a ptr_ring */\n                                       spin_unlock(\u0026amp;q-\u0026gt;producer_lock)\n                                       __list_del_clearprev(flush_node)\n                                         /* establece flush_node.prev = NULL */\n  \u0026lt;-- La Tarea A se reanuda --\u0026gt;\n  __list_del_clearprev(flush_node)\n    flush_node.prev-\u0026gt;next = ...\n    /* prev es NULL -\u0026gt; kernel oops */\n\nSolucione esto a\u00f1adiendo un local_lock_t a xdp_bulk_queue y adquiri\u00e9ndolo en bq_enqueue() y __cpu_map_flush(). Estas rutas ya se ejecutan bajo local_bh_disable(), por lo que se usa local_lock_nested_bh() que en sistemas no-RT es una anotaci\u00f3n pura sin sobrecarga, y en PREEMPT_RT proporciona un bloqueo de suspensi\u00f3n por CPU que serializa el acceso a la bq.\n\nPara reproducir, inserte un mdelay(100) entre bq-\u0026gt;count = 0 y __list_del_clearprev() en bq_flush_to_queue(), luego ejecute el reproductor proporcionado por syzkaller."
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  "id": "CVE-2026-23342",
  "lastModified": "2026-04-23T21:16:19.007",
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CVE-2026-23342 (GCVE-0-2026-23342)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:04

Title

bpf: Fix race in cpumap on PREEMPT_RT

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/7466ae2aeed483de8…
https://git.kernel.org/stable/c/e67299e1044349ad0…
https://git.kernel.org/stable/c/869c63d5975d55e97…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3253cb49cbad4772389d6ef55be75db1f97da910 , < 7466ae2aeed483de80c5d8dea0913cf74038b652 (git) Affected: 3253cb49cbad4772389d6ef55be75db1f97da910 , < e67299e1044349ad0088d52c6bc5764cc1816c06 (git) Affected: 3253cb49cbad4772389d6ef55be75db1f97da910 , < 869c63d5975d55e97f6b168e885452b3da20ea47 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix race in cpumap on PREEMPT_RT\n\nOn PREEMPT_RT kernels, the per-CPU xdp_bulk_queue (bq) can be accessed\nconcurrently by multiple preemptible tasks on the same CPU.\n\nThe original code assumes bq_enqueue() and __cpu_map_flush() run\natomically with respect to each other on the same CPU, relying on\nlocal_bh_disable() to prevent preemption. However, on PREEMPT_RT,\nlocal_bh_disable() only calls migrate_disable() (when\nPREEMPT_RT_NEEDS_BH_LOCK is not set) and does not disable\npreemption, which allows CFS scheduling to preempt a task during\nbq_flush_to_queue(), enabling another task on the same CPU to enter\nbq_enqueue() and operate on the same per-CPU bq concurrently.\n\nThis leads to several races:\n\n1. Double __list_del_clearprev(): after bq-\u003ecount is reset in\n   bq_flush_to_queue(), a preempting task can call bq_enqueue() -\u003e\n   bq_flush_to_queue() on the same bq when bq-\u003ecount reaches\n   CPU_MAP_BULK_SIZE. Both tasks then call __list_del_clearprev()\n   on the same bq-\u003eflush_node, the second call dereferences the\n   prev pointer that was already set to NULL by the first.\n\n2. bq-\u003ecount and bq-\u003eq[] races: concurrent bq_enqueue() can corrupt\n   the packet queue while bq_flush_to_queue() is processing it.\n\nThe race between task A (__cpu_map_flush -\u003e bq_flush_to_queue) and\ntask B (bq_enqueue -\u003e bq_flush_to_queue) on the same CPU:\n\n  Task A (xdp_do_flush)          Task B (cpu_map_enqueue)\n  ----------------------         ------------------------\n  bq_flush_to_queue(bq)\n    spin_lock(\u0026q-\u003eproducer_lock)\n    /* flush bq-\u003eq[] to ptr_ring */\n    bq-\u003ecount = 0\n    spin_unlock(\u0026q-\u003eproducer_lock)\n                                   bq_enqueue(rcpu, xdpf)\n    \u003c-- CFS preempts Task A --\u003e      bq-\u003eq[bq-\u003ecount++] = xdpf\n                                     /* ... more enqueues until full ... */\n                                     bq_flush_to_queue(bq)\n                                       spin_lock(\u0026q-\u003eproducer_lock)\n                                       /* flush to ptr_ring */\n                                       spin_unlock(\u0026q-\u003eproducer_lock)\n                                       __list_del_clearprev(flush_node)\n                                         /* sets flush_node.prev = NULL */\n    \u003c-- Task A resumes --\u003e\n    __list_del_clearprev(flush_node)\n      flush_node.prev-\u003enext = ...\n      /* prev is NULL -\u003e kernel oops */\n\nFix this by adding a local_lock_t to xdp_bulk_queue and acquiring it\nin bq_enqueue() and __cpu_map_flush(). These paths already run under\nlocal_bh_disable(), so use local_lock_nested_bh() which on non-RT is\na pure annotation with no overhead, and on PREEMPT_RT provides a\nper-CPU sleeping lock that serializes access to the bq.\n\nTo reproduce, insert an mdelay(100) between bq-\u003ecount = 0 and\n__list_del_clearprev() in bq_flush_to_queue(), then run reproducer\nprovided by syzkaller."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:04:59.186Z",
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/869c63d5975d55e97f6b168e885452b3da20ea47"
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      ],
      "title": "bpf: Fix race in cpumap on PREEMPT_RT",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23342",
    "datePublished": "2026-03-25T10:27:30.285Z",
    "dateReserved": "2026-01-13T15:37:45.999Z",
    "dateUpdated": "2026-05-11T22:04:59.186Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Action not permitted

FKIE_CVE-2026-23342

CVE-2026-23342 (GCVE-0-2026-23342)

Tags

Sightings

Nomenclature