Vulnerability-Lookup

FKIE_CVE-2026-80758

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: futex: Avoid private hash use-after-free on final put futex_private_hash_put() drops the reference to fph before evaluating fph->mm for wake_up_var(). futex_ref_put() enables preemption again before returning. If that put drops the final reference and the task is preempted, another task can pivot to the replacement hash and free the old hash after an RCU grace period. The first task then reads fph->mm from the freed allocation when it resumes. KASAN reports a slab-use-after-free in futex_private_hash_put(), with the read at offset 24 in a freed kmalloc-512 allocation. The allocation and free stacks point to futex_hash_allocate() and the RCU free path, respectively. Load the mm pointer while the fph reference is still held and pass the saved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue key and does not dereference the mm through it.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/12cd315a7b6a7d7db3f69d98bfe3909275e9451d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1c7efabfbaf796f11000a46094a69955a01ec6cc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/25408c62ed4ebcd491d0e9e4b4a5b512547512e4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dba60d26e9dda3e157ad6b0934d4232f6c6904ee

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dba60d26e9dda3e157ad6b0934d4232f6c6904ee",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "12cd315a7b6a7d7db3f69d98bfe3909275e9451d",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "25408c62ed4ebcd491d0e9e4b4a5b512547512e4",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "1c7efabfbaf796f11000a46094a69955a01ec6cc",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "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\nfutex: Avoid private hash use-after-free on final put\n\nfutex_private_hash_put() drops the reference to fph before evaluating\nfph-\u003emm for wake_up_var(). futex_ref_put() enables preemption again before\nreturning. If that put drops the final reference and the task is preempted,\nanother task can pivot to the replacement hash and free the old hash after\nan RCU grace period. The first task then reads fph-\u003emm from the freed\nallocation when it resumes.\n\nKASAN reports a slab-use-after-free in futex_private_hash_put(), with the\nread at offset 24 in a freed kmalloc-512 allocation. The allocation and\nfree stacks point to futex_hash_allocate() and the RCU free path,\nrespectively.\n\nLoad the mm pointer while the fph reference is still held and pass the\nsaved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue\nkey and does not dereference the mm through it."
    }
  ],
  "id": "CVE-2026-80758",
  "lastModified": "2026-09-04T16:18:00.830",
  "metrics": {},
  "published": "2026-09-04T16:18:00.830",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/12cd315a7b6a7d7db3f69d98bfe3909275e9451d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c7efabfbaf796f11000a46094a69955a01ec6cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/25408c62ed4ebcd491d0e9e4b4a5b512547512e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dba60d26e9dda3e157ad6b0934d4232f6c6904ee"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-80758 (GCVE-0-2026-80758)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12

Title

futex: Avoid private hash use-after-free on final put

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/dba60d26e9dda3e15…
https://git.kernel.org/stable/c/12cd315a7b6a7d7db…
https://git.kernel.org/stable/c/25408c62ed4ebcd49…
https://git.kernel.org/stable/c/1c7efabfbaf796f11…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bd54df5ea7cadac520e346d5f0fe5d58e635b6ba , < dba60d26e9dda3e157ad6b0934d4232f6c6904ee (git) Affected: bd54df5ea7cadac520e346d5f0fe5d58e635b6ba , < 12cd315a7b6a7d7db3f69d98bfe3909275e9451d (git) Affected: bd54df5ea7cadac520e346d5f0fe5d58e635b6ba , < 25408c62ed4ebcd491d0e9e4b4a5b512547512e4 (git) Affected: bd54df5ea7cadac520e346d5f0fe5d58e635b6ba , < 1c7efabfbaf796f11000a46094a69955a01ec6cc (git)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.1.11 , ≤ 7.1.* (semver) Unaffected: 7.2.1 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dba60d26e9dda3e157ad6b0934d4232f6c6904ee",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "12cd315a7b6a7d7db3f69d98bfe3909275e9451d",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "25408c62ed4ebcd491d0e9e4b4a5b512547512e4",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            },
            {
              "lessThan": "1c7efabfbaf796f11000a46094a69955a01ec6cc",
              "status": "affected",
              "version": "bd54df5ea7cadac520e346d5f0fe5d58e635b6ba",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/futex/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "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": "6.18.47",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Avoid private hash use-after-free on final put\n\nfutex_private_hash_put() drops the reference to fph before evaluating\nfph-\u003emm for wake_up_var(). futex_ref_put() enables preemption again before\nreturning. If that put drops the final reference and the task is preempted,\nanother task can pivot to the replacement hash and free the old hash after\nan RCU grace period. The first task then reads fph-\u003emm from the freed\nallocation when it resumes.\n\nKASAN reports a slab-use-after-free in futex_private_hash_put(), with the\nread at offset 24 in a freed kmalloc-512 allocation. The allocation and\nfree stacks point to futex_hash_allocate() and the RCU free path,\nrespectively.\n\nLoad the mm pointer while the fph reference is still held and pass the\nsaved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue\nkey and does not dereference the mm through it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:27.689Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/dba60d26e9dda3e157ad6b0934d4232f6c6904ee"
        },
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          "url": "https://git.kernel.org/stable/c/12cd315a7b6a7d7db3f69d98bfe3909275e9451d"
        },
        {
          "url": "https://git.kernel.org/stable/c/25408c62ed4ebcd491d0e9e4b4a5b512547512e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c7efabfbaf796f11000a46094a69955a01ec6cc"
        }
      ],
      "title": "futex: Avoid private hash use-after-free on final put",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80758",
    "datePublished": "2026-09-04T15:12:27.689Z",
    "dateReserved": "2026-08-26T14:34:25.791Z",
    "dateUpdated": "2026-09-04T15:12:27.689Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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