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bpf: Fix use-after-free on mm_struct in bpf_find_vma()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free on mm_struct in bpf_find_vma() bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without holding a reference on the mm. On a foreign task, a concurrent exit_mm() can free the mm_struct between the lockless read and the trylock, resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU. For the current task, task->mm is stable. For a foreign task, pin the mm under task->alloc_lock and release it with mmput_async(), mirroring commit d8e27d2d22b6 ("bpf: fix mm lifecycle in open-coded task_vma iterator"). Use spin_trylock() instead of get_task_mm() so BPF context does not block on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the foreign-task path because dropping the mm reference is not safe there. Race: CPU0 (BPF program) CPU1 (exiting task) ============================ ========================== bpf_find_vma(foreign_task): mm = task->mm exit_mm(): task->mm = NULL mmput(mm) -> frees mm_struct mmap_read_trylock(mm) // UAF on mm

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.188, 6.12.110, 6.18.52, 6.6.157, 7.2.6
CVEs
CVE-2026-93137
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 10:23 UTC · Revision 1

Source evidence

bpf: Fix use-after-free on mm_struct in bpf_find_vma()

core-osv · Original source

Published 17 Sept 2026, 16:11 UTC

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free on mm_struct in bpf_find_vma() bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without holding a reference on the mm. On a foreign task, a concurrent exit_mm() can free the mm_struct between the lockless read and the trylock, resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU. For the current task, task->mm is stable. For a foreign task, pin the mm under task->alloc_lock and release it with mmput_async(), mirroring commit d8e27d2d22b6 ("bpf: fix mm lifecycle in open-coded task_vma iterator"). Use spin_trylock() instead of get_task_mm() so BPF context does not block on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the foreign-task path because dropping the mm reference is not safe there. Race: CPU0 (BPF program) CPU1 (exiting task) ============================ ========================== bpf_find_vma(foreign_task): mm = task->mm exit_mm(): task->mm = NULL mmput(mm) -> frees mm_struct mmap_read_trylock(mm) // UAF on mm

osv:CVE-2026-93137

Kernel

Fixed versions: 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6

Complete source record
{
  "id": "1a18948887565c0acc8b71fb7f4c072527c240a1a3d3be0ca02e10e41aaa5999",
  "url": "https://osv.dev/vulnerability/CVE-2026-93137",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix use-after-free on mm_struct in bpf_find_vma()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free on mm_struct in bpf_find_vma() bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without holding a reference on the mm. On a foreign task, a concurrent exit_mm() can free the mm_struct between the lockless read and the trylock, resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU. For the current task, task->mm is stable. For a foreign task, pin the mm under task->alloc_lock and release it with mmput_async(), mirroring commit d8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\"). Use spin_trylock() instead of get_task_mm() so BPF context does not block on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the foreign-task path because dropping the mm reference is not safe there. Race: CPU0 (BPF program) CPU1 (exiting task) ============================ ========================== bpf_find_vma(foreign_task): mm = task->mm exit_mm(): task->mm = NULL mmput(mm) -> frees mm_struct mmap_read_trylock(mm) // UAF on mm",
    "evidence": "osv:CVE-2026-93137",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-93137",
      "aliases": [
        "CVE-2026-93137"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                {
                  "fixed": "86d54cf069fc5ae2e111c87933bebf6eb527978e"
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                {
                  "fixed": "2b2a903bee56d312539046d9defa8023eec94760"
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          ],
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                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.157"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
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              ]
            },
            {
              "type": "ECOSYSTEM",
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            },
            {
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93137.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.800658951Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760",
        "https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5",
        "https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e",
        "https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5",
        "https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384",
        "https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93137.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93137",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93137.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93137",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494472,
  "published_at": "2026-09-17T16:11:38.135+00:00"
}