Vulnerability-Lookup

CVE-2026-93137 (GCVE-0-2026-93137)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11

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

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/db347840d6b6ee9bb…
https://git.kernel.org/stable/c/8e1101fc4118019a6…
https://git.kernel.org/stable/c/c7ad910e987008e12…
https://git.kernel.org/stable/c/86d54cf069fc5ae2e…
https://git.kernel.org/stable/c/2b2a903bee56d3125…
https://git.kernel.org/stable/c/47b079e2117a2ee52…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < db347840d6b6ee9bb9b8e4a985d4b4419f9f3200 (git) Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < 8e1101fc4118019a69c96ced4aec93164f89cbd5 (git) Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < c7ad910e987008e125eeff448892e86852173384 (git) Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < 86d54cf069fc5ae2e111c87933bebf6eb527978e (git) Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < 2b2a903bee56d312539046d9defa8023eec94760 (git) Affected: 7c7e3d31e7856a8260a254f8c71db416f7f9f5a1 , < 47b079e2117a2ee52e21f8b72935900c702fc0b5 (git)	guessed
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/task_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "db347840d6b6ee9bb9b8e4a985d4b4419f9f3200",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "8e1101fc4118019a69c96ced4aec93164f89cbd5",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "86d54cf069fc5ae2e111c87933bebf6eb527978e",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "2b2a903bee56d312539046d9defa8023eec94760",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "47b079e2117a2ee52e21f8b72935900c702fc0b5",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/task_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task-\u003emm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task-\u003emm is stable. For a foreign task, pin the mm\nunder task-\u003ealloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task-\u003emm\n                                      exit_mm():\n                                        task-\u003emm = NULL\n                                        mmput(mm) -\u003e frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:11:38.135Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384"
        },
        {
          "url": "https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760"
        },
        {
          "url": "https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5"
        }
      ],
      "title": "bpf: Fix use-after-free on mm_struct in bpf_find_vma()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93137",
    "datePublished": "2026-09-17T16:11:38.135Z",
    "dateReserved": "2026-09-17T16:02:15.088Z",
    "dateUpdated": "2026-09-17T16:11:38.135Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-93137\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-17T17:18:08.600\",\"lastModified\":\"2026-09-17T17:18:08.600\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\\n\\nbpf_find_vma() reads task-\u003emm and calls mmap_read_trylock(mm) without\\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\\ncan free the mm_struct between the lockless read and the trylock,\\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\\n\\nFor the current task, task-\u003emm is stable. For a foreign task, pin the mm\\nunder task-\u003ealloc_lock and release it with mmput_async(), mirroring commit\\nd8e27d2d22b6 (\\\"bpf: fix mm lifecycle in open-coded task_vma iterator\\\").\\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\\nforeign-task path because dropping the mm reference is not safe there.\\n\\nRace:\\n\\n  CPU0 (BPF program)                  CPU1 (exiting task)\\n  ============================        ==========================\\n  bpf_find_vma(foreign_task):\\n    mm = task-\u003emm\\n                                      exit_mm():\\n                                        task-\u003emm = NULL\\n                                        mmput(mm) -\u003e frees mm_struct\\n    mmap_read_trylock(mm)\\n        // UAF on mm\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/task_iter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"db347840d6b6ee9bb9b8e4a985d4b4419f9f3200\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"8e1101fc4118019a69c96ced4aec93164f89cbd5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"c7ad910e987008e125eeff448892e86852173384\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"86d54cf069fc5ae2e111c87933bebf6eb527978e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"2b2a903bee56d312539046d9defa8023eec94760\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\"lessThan\":\"47b079e2117a2ee52e21f8b72935900c702fc0b5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/task_iter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:11:43Z",
      "cve": "CVE-2026-93137",
      "id": "CVE-2026-93137",
      "initial_release_date": "2026-09-18T00:11:43Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93137",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93137.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-93137

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/task_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "db347840d6b6ee9bb9b8e4a985d4b4419f9f3200",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "8e1101fc4118019a69c96ced4aec93164f89cbd5",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "c7ad910e987008e125eeff448892e86852173384",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "86d54cf069fc5ae2e111c87933bebf6eb527978e",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "2b2a903bee56d312539046d9defa8023eec94760",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            },
            {
              "lessThan": "47b079e2117a2ee52e21f8b72935900c702fc0b5",
              "status": "affected",
              "version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/task_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task-\u003emm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task-\u003emm is stable. For a foreign task, pin the mm\nunder task-\u003ealloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task-\u003emm\n                                      exit_mm():\n                                        task-\u003emm = NULL\n                                        mmput(mm) -\u003e frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm"
    }
  ],
  "id": "CVE-2026-93137",
  "lastModified": "2026-09-17T17:18:08.600",
  "metrics": {},
  "published": "2026-09-17T17:18:08.600",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-45WG-MG8V-JX77

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93137"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task-\u003emm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task-\u003emm is stable. For a foreign task, pin the mm\nunder task-\u003ealloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task-\u003emm\n                                      exit_mm():\n                                        task-\u003emm = NULL\n                                        mmput(mm) -\u003e frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm",
  "id": "GHSA-45wg-mg8v-jx77",
  "modified": "2026-09-17T18:32:11Z",
  "published": "2026-09-17T18:32:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93137"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

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Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-93137 (GCVE-0-2026-93137)

FKIE_CVE-2026-93137

GHSA-45WG-MG8V-JX77

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