Vulnerability-Lookup

FKIE_CVE-2024-38580

Vulnerability from fkie_nvd - Published: 2024-06-19 14:15 - Updated: 2026-08-04 11:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: epoll: be better about file lifetimes epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless. Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9
linux	linux_kernel	6.9

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nepoll: be better about file lifetimes\n\nepoll can call out to vfs_poll() with a file pointer that may race with\nthe last \u0027fput()\u0027. That would make f_count go down to zero, and while\nthe ep-\u003emtx locking means that the resulting file pointer tear-down will\nbe blocked until the poll returns, it means that f_count is already\ndead, and any use of it won\u0027t actually get a reference to the file any\nmore: it\u0027s dead regardless.\n\nMake sure we have a valid ref on the file pointer before we call down to\nvfs_poll() from the epoll routines."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: epoll: mejore la duraci\u00f3n de los archivos epoll puede llamar a vfs_poll() con un puntero de archivo que puede competir con el \u00faltimo \u0027fput()\u0027. Eso har\u00eda que f_count bajara a cero, y aunque el bloqueo ep-\u0026gt;mtx significa que el desmontaje del puntero del archivo resultante se bloquear\u00e1 hasta que regrese la encuesta, significa que f_count ya est\u00e1 muerto y no se podr\u00e1 utilizar. De hecho, ya no obtengo una referencia al archivo: est\u00e1 muerto de todos modos. Aseg\u00farese de tener una referencia v\u00e1lida en el puntero del archivo antes de llamar a vfs_poll() desde las rutinas de epoll."
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  "id": "CVE-2024-38580",
  "lastModified": "2026-08-04T11:18:48.367",
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}

CVE-2024-38580 (GCVE-0-2024-38580)

Vulnerability from cvelistv5 – Published: 2024-06-19 13:37 – Updated: 2026-08-05 11:32

Title

epoll: be better about file lifetimes

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 17:13 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/cbfd1088e24ec4c11…
https://git.kernel.org/stable/c/559214eb4e5c3d05e…
https://git.kernel.org/stable/c/4f65f4defe4e23659…
https://git.kernel.org/stable/c/16e3182f6322575eb…
https://git.kernel.org/stable/c/4efaa5acf0a1d2b59…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 559214eb4e5c3d05e69428af2fae2691ba1eb784 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4f65f4defe4e23659275ce5153541cd4f76ce2d2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 16e3182f6322575eb7c12e728ad3c7986a189d5d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4efaa5acf0a1d2b5947f98abb3acf8bfd966422b (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.93 , ≤ 6.1.* (semver) Unaffected: 6.6.33 , ≤ 6.6.* (semver) Unaffected: 6.8.12 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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          "dateUpdated": "2024-08-02T04:12:25.965Z",
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              "status": "unaffected",
              "version": "6.1.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.8.*",
              "status": "unaffected",
              "version": "6.8.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.9",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.161",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.93",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.33",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8.12",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nepoll: be better about file lifetimes\n\nepoll can call out to vfs_poll() with a file pointer that may race with\nthe last \u0027fput()\u0027. That would make f_count go down to zero, and while\nthe ep-\u003emtx locking means that the resulting file pointer tear-down will\nbe blocked until the poll returns, it means that f_count is already\ndead, and any use of it won\u0027t actually get a reference to the file any\nmore: it\u0027s dead regardless.\n\nMake sure we have a valid ref on the file pointer before we call down to\nvfs_poll() from the epoll routines."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached purely through local syscalls \u2014 epoll_ctl(EPOLL_CTL_ADD) to register a pollable fd, epoll_wait() to drive ep_send_events()\u2192ep_item_poll(), and close() on the registered fd from a second thread. No network input is involved.\nAC:L - The attacker controls both sides of the race (one thread spins on close() of the registered fd, another spins on epoll_wait()), so the window can be hit repeatedly and indefinitely until won; syzbot produced a reproducer. Nothing depends on conditions outside attacker influence.\nPR:L - Only an ordinary unprivileged local user is needed \u2014 epoll requires no capabilities at all, and dma-buf fds are obtainable without privilege via /dev/dma_heap/system on Android or DRM render nodes (/dev/dri/renderD128, PRIME_HANDLE_TO_FD) on desktop/server, all reachable from inside containers and app sandboxes.\nUI:N - The attacker performs every step itself from its own threads; no action by any other user or victim process is required.\nS:U - The corruption is confined to kernel memory within the same security authority \u2014 this is a standard local kernel privilege-escalation primitive, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - vfs_poll() runs on a struct file with f_count already zero, and the resulting refcount underflow frees the file while it is still referenced, yielding a use-after-free on a SLAB_TYPESAFE_BY_RCU slot that is instantly reallocated to another struct file; reading through the stale file (f_cred, f_path, private_data) gives arbitrary kernel memory and other processes\u0027 file contents.\nI:H - The double __fput()/double file_free() plus stray refcount decrement on a live, reallocated struct file is the classic DirtyCred-style write primitive \u2014 the attacker can force premature release of a victim\u0027s file and substitute its own, enabling arbitrary file/credential overwrite and full control-flow hijack.\nA:H - syzbot\u0027s observed manifestation is a kernel general protection fault in __ep_remove (fs/eventpoll.c:825, NULL file-\u003ef_ep), and the double-free of struct file, dentry and vfsmount reliably panics the machine, so an unprivileged user can crash the kernel at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:32:56.809Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e"
        },
        {
          "url": "https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b"
        }
      ],
      "title": "epoll: be better about file lifetimes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-38580",
    "datePublished": "2024-06-19T13:37:37.840Z",
    "dateReserved": "2024-06-18T19:36:34.927Z",
    "dateUpdated": "2026-08-05T11:32:56.809Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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