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CVE-2025-68294 (GCVE-0-2025-68294)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-08-05 12:10
VLAI
Title
io_uring/net: ensure vectored buffer node import is tied to notification
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/net: ensure vectored buffer node import is tied to notification When support for vectored registered buffers was added, the import itself is using 'req' rather than the notification io_kiocb, sr->notif. For non-vectored imports, sr->notif is correctly used. This is important as the lifetime of the two may be different. Use the correct io_kiocb for the vectored buffer import.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 23371eac7d9a9bca5360cfb3eb3aa08648ee7246 , < 14459281e027f23b70885c1cc1032a71c0efd8d7 (git)
Affected: 23371eac7d9a9bca5360cfb3eb3aa08648ee7246 , < f6041803a831266a2a5a5b5af66f7de0845bcbf3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "programFiles": [
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              "value": "AV:L - Exploitation requires a local process to submit an IORING_OP_SENDMSG_ZC operation through io_uring; incoming network traffic alone cannot reach the vulnerable import path.\nAC:L - The attacker controls buffer registration, the vectored send, notification lifetime, and buffer unregistration or replacement. A corked, congested, or deliberately stalled socket can reliably keep the notification outstanding after the main request completes.\nPR:L - An ordinary unprivileged user can create an io_uring instance, register their own memory, and use TCP or UDP sockets without capabilities when io_uring is enabled under its default policy.\nUI:N - No action by another user is required after the attacker submits the operations and manipulates the registered-buffer lifetime.\nS:U - Any resulting kernel compromise is a conventional local privilege escalation within the host kernel\u0027s security authority, not a mandatory cross-scope escape.\nC:H - The premature unpin permits network transmission to continue reading pages after they have been freed or recycled, potentially disclosing arbitrary kernel or other-process memory to an attacker-controlled peer.\nI:H - The stale managed fragments can cause page-reference and allocator corruption when subsequently referenced or downgraded, providing a use-after-free-class primitive that can plausibly be developed into arbitrary memory modification or kernel code execution.\nA:H - Accessing or changing references on prematurely released pages can trigger kernel faults, allocator corruption, oopses, or a system panic."
            }
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        "dateUpdated": "2026-08-05T12:10:41.250Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3"
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    "datePublished": "2025-12-16T15:06:14.177Z",
    "dateReserved": "2025-12-16T14:48:05.293Z",
    "dateUpdated": "2026-08-05T12:10:41.250Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: ensure vectored buffer node import is tied to notification\n\nWhen support for vectored registered buffers was added, the import\nitself is using \u0027req\u0027 rather than the notification io_kiocb, sr-\u003enotif.\nFor non-vectored imports, sr-\u003enotif is correctly used. This is important\nas the lifetime of the two may be different. Use the correct io_kiocb\nfor the vectored buffer import."
          }
        ],
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        "lastModified": "2026-07-30T06:24:36.820",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "published": "2025-12-16T16:16:08.303",
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      "current_release_date": "2026-07-30T08:34:05+00:00",
      "cve": "CVE-2025-68294",
      "id": "CVE-2025-68294",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in io_uring/net due to incorrect buffer handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68294.json",
      "version": "3"
    }
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}



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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.
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  • 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.


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