CVE-2026-80713 (GCVE-0-2026-80713)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22
VLAI
Title
io_uring: preserve task restrictions across exec
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring: preserve task restrictions across exec Per-task restrictions apply to all rings created by a task. Once installed, they should not be dropped across exec. For a task that has used io_uring, the exec cancellation path calls __io_uring_free(). This frees both the task context and the per-task restriction, so a ring created after exec is unrestricted. Split task context cleanup into io_uring_free_tctx(), and use it from the exec cancellation path. Keep __io_uring_free() for final task cleanup, where both the context and restriction are released.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ed82f35b926b2e505c14b7006473614b8f58b4f4 , < fcef9325afeecced693a7438e975e4a3f8e2716f (git)
Affected: ed82f35b926b2e505c14b7006473614b8f58b4f4 , < bc0e8faf90e776a2f1f3967a04e8091e6bdb4977 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "io_uring/cancel.c",
            "io_uring/tctx.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: preserve task restrictions across exec\n\nPer-task restrictions apply to all rings created by a task. Once\ninstalled, they should not be dropped across exec.\n\nFor a task that has used io_uring, the exec cancellation path calls\n__io_uring_free(). This frees both the task context and the per-task\nrestriction, so a ring created after exec is unrestricted.\n\nSplit task context cleanup into io_uring_free_tctx(), and use it from\nthe exec cancellation path. Keep __io_uring_free() for final task\ncleanup, where both the context and restriction are released."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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          "scenarios": [
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              "value": "AV:L - The flaw is reached only via local io_uring syscalls (io_uring_setup/io_uring_register) and execve(); fs/exec.c calls io_uring_task_cancel() which invokes the buggy __io_uring_free() path, and per kernel guidance io_uring is Local not Network.\nAC:L - The attacker fully controls the trigger by calling io_uring_setup() to create a task context then execve(); exec deterministically runs io_uring_cancel_generic(true) and frees per-task restrictions without races, special memory layout, or other uncontrollable conditions.\nPR:L - Exploitation requires only an unprivileged local process that had per-task io_uring restrictions installed by a parent/sandbox; the attacker needs no init-namespace CAP_SYS_ADMIN and can use io_uring unless blocked by sysctl or LSM policy.\nUI:N - No victim interaction is required; the confined attacker process itself performs io_uring_setup and execve to drop restrictions, then io_uring_setup again to obtain an unrestricted ring without administrator or other-user action.\nS:C - Per-task io_uring restrictions are a confinement policy enforced by a separate sandbox/parent authority; clearing them across exec lets post-exec code exceed that policy and access kernel interfaces explicitly withheld, crossing the intended sandbox security boundary.\nC:H - Dropping restrictions re-enables blocked io_uring SQEs, register operations, and BPF filters, including IORING_OP_URING_CMD and read-oriented ops against kernel/driver interfaces denied by policy, enabling disclosure beyond the confinement authority\u0027s intent.\nI:H - Bypass restores the full unrestricted io_uring opcode and register surface (writes, open/link ops, IORING_OP_URING_CMD, buffer/file registration), allowing post-exec integrity-affecting kernel and driver interactions explicitly denied by per-task restrictions.\nA:N - The vulnerability only incorrectly frees restriction metadata during exec cleanup; it does not directly cause kernel panics, oopses, deadlocks, or hangs, so there is no availability impact from the bug itself."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:29.500Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/fcef9325afeecced693a7438e975e4a3f8e2716f"
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          "url": "https://git.kernel.org/stable/c/bc0e8faf90e776a2f1f3967a04e8091e6bdb4977"
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    "datePublished": "2026-08-28T06:53:12.438Z",
    "dateReserved": "2026-08-26T14:34:25.788Z",
    "dateUpdated": "2026-08-29T06:22:29.500Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.01478"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: preserve task restrictions across exec\n\nPer-task restrictions apply to all rings created by a task. Once\ninstalled, they should not be dropped across exec.\n\nFor a task that has used io_uring, the exec cancellation path calls\n__io_uring_free(). This frees both the task context and the per-task\nrestriction, so a ring created after exec is unrestricted.\n\nSplit task context cleanup into io_uring_free_tctx(), and use it from\nthe exec cancellation path. Keep __io_uring_free() for final task\ncleanup, where both the context and restriction are released."
          }
        ],
        "id": "CVE-2026-80713",
        "lastModified": "2026-08-29T07:16:52.763",
        "metrics": {
          "cvssMetricV31": [
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                "attackVector": "LOCAL",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-08-31T16:11:56+00:00",
      "cve": "CVE-2026-80713",
      "id": "CVE-2026-80713",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: io_uring: preserve task restrictions across exec",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80713.json",
      "version": "3"
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      "current_release_date": "2026-09-01T13:25:43Z",
      "cve": "CVE-2026-80713",
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      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80713",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80713.json",
      "version": "4"
    }
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}



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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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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.


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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.