CVE-2025-39888 (GCVE-0-2025-39888)

Vulnerability from cvelistv5 – Published: 2025-09-23 06:00 – Updated: 2026-08-05 12:05
VLAI
Title
fuse: Block access to folio overlimit
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: Block access to folio overlimit syz reported a slab-out-of-bounds Write in fuse_dev_do_write. When the number of bytes to be retrieved is truncated to the upper limit by fc->max_pages and there is an offset, the oob is triggered. Add a loop termination condition to prevent overruns.
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:26 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3568a956932621cafadafc8b75fcf6dc06555105 , < 623719227b114d73a2cee45f1b343ced63ce09ec (git)
Affected: 3568a956932621cafadafc8b75fcf6dc06555105 , < 9d81ba6d49a7457784f0b6a71046818b86ec7e44 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                  "value": "AV:L - The vulnerability is reached by a local process writing a FUSE_NOTIFY_RETRIEVE message to an open /dev/fuse file descriptor; no network or physical access is involved.\nAC:L - Every parameter that determines the overflow is attacker-controlled \u2014 max_pages and max_write via the FUSE_INIT reply, file size via attribute replies, page-cache residency via FUSE_NOTIFY_STORE, and the intra-page offset via the notify message \u2014 making the overflow deterministic and repeatable.\nPR:L - An unprivileged local user suffices: FUSE is flagged FS_USERNS_MOUNT so a mount can be created inside an unprivileged user namespace (unshare -Ur), and the setuid fusermount helper offers the same on typical distros; the notify path itself has no capability check.\nUI:N - The attacker acts as both the FUSE server and the client, populating the page cache from the server side via FUSE_NOTIFY_STORE and issuing the malicious retrieve notification itself, so no victim action is needed.\nS:U - The heap corruption occurs in kernel memory belonging to the same security authority as the attacking process; this is standard kernel privilege escalation with no crossing of a hypervisor or IOMMU boundary.\nC:H - Overwriting descs[0] with a folio pointer yields a ~0xffffea00 byte offset passed to kmap_local_folio(), causing a large out-of-bounds kernel read whose contents are copied straight into the attacker\u0027s userspace read() buffer on /dev/fuse.\nI:H - This is a slab out-of-bounds write of 8 attacker-influenced bytes past the kzalloc\u0027d allocation, and because the attacker tunes max_pages to land the allocation exactly on a kmalloc bucket boundary the write corrupts an adjacent slab object \u2014 a classic heap-corruption primitive for privilege escalation.\nA:H - The out-of-bounds write plus the resulting wild-pointer read from a bogus folio offset reliably produce memory corruption and an oops/panic, as demonstrated by the KASAN-detected slab-out-of-bounds write in the syzbot reproducer."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:05:54.198Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/623719227b114d73a2cee45f1b343ced63ce09ec"
            },
            {
              "url": "https://git.kernel.org/stable/c/9d81ba6d49a7457784f0b6a71046818b86ec7e44"
            }
          ],
          "title": "fuse: Block access to folio overlimit",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39888",
        "datePublished": "2025-09-23T06:00:54.156Z",
        "dateReserved": "2025-04-16T07:20:57.145Z",
        "dateUpdated": "2026-08-05T12:05:54.198Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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.