Vulnerability-Lookup

GSD-2021-47124

Vulnerability from gsd - Updated: 2024-03-05 06:03

Details

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 Call Trace: __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] io_put_req fs/io_uring.c:2140 [inline] io_queue_linked_timeout fs/io_uring.c:6300 [inline] __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354 io_submit_sqe fs/io_uring.c:6534 [inline] io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline] __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182 io_link_timeout_fn() should put only one reference of the linked timeout request, however in case of racing with the master request's completion first io_req_complete() puts one and then io_put_req_deferred() is called.

Aliases

CVE-2021-47124

JSON

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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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      "aliases": [
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      "modified": "2024-03-05T06:03:55.181267Z",
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CVE-2021-47124 (GCVE-0-2021-47124)

Vulnerability from cvelistv5 – Published: 2024-03-15 20:14 – Updated: 2026-08-05 08:46

Title

io_uring: fix link timeout refs

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 2024-03-18 20:27 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/0b2a990e5d2f76d02…
https://git.kernel.org/stable/c/6f5d7a45f58d3abe3…
https://git.kernel.org/stable/c/876808dba2ff7509b…
https://git.kernel.org/stable/c/ff4a96ba5c8f9b266…
https://git.kernel.org/stable/c/a298232ee6b9a1d5d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff , < 0b2a990e5d2f76d020cb840c456e6ec5f0c27530 (git) Affected: 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff , < 6f5d7a45f58d3abe3a936de1441b8d6318f978ff (git) Affected: 9ae1f8dd372e0e4c020b345cf9e09f519265e981 , < 876808dba2ff7509bdd7f230c4f374a0caf4f410 (git) Affected: 9ae1f8dd372e0e4c020b345cf9e09f519265e981 , < ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 (git) Affected: 9ae1f8dd372e0e4c020b345cf9e09f519265e981 , < a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 (git) Affected: 567c81912cec641db75ac6cb64c63f8367c97d19 (git) Affected: 5.10.26 , < 5.10.43 (semver) Affected: 5.10.26 , < 5.10.55 (semver) Affected: 5.11.6 , < 5.12 (semver)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.10.43 , ≤ 5.10.* (semver) Unaffected: 5.10.55 , ≤ 5.10.* (semver) Unaffected: 5.12.10 , ≤ 5.12.* (semver) Unaffected: 5.12.19 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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            {
              "lang": "en",
              "value": "AV:L - The bug is in io_uring\u0027s linked-timeout hrtimer path (io_link_timeout_fn), reached only via local io_uring_setup/io_uring_enter syscalls after submitting IORING_OP_LINK_TIMEOUT, not via network packet processing.\nAC:L - The race is between master-request completion and the linked-timeout hrtimer; the attacker controls both sides by choosing the linked operation and timeout duration and can retry until the double-put hits.\nPR:L - Any unprivileged local user can create an io_uring and submit linked timeouts; io_uring_setup has no CAP_SYS_ADMIN gate for this path (CAP_IPC_LOCK is only for locked-memory accounting).\nUI:N - Exploitation requires only the attacker\u0027s own io_uring submissions; no victim action such as mounting a filesystem or opening a crafted file is needed.\nS:U - A successful exploit yields corruption or control within the local kernel authority (typical local privilege escalation), not a cross-boundary escape such as guest-to-host or IOMMU bypass.\nC:H - The bug double-puts the linked-timeout io_kiocb (atomic_t refs, no saturation), freeing it then touching it again\u2014a use-after-free that can be reused for arbitrary kernel memory disclosure.\nI:H - Use-after-free of a slab-allocated io_kiocb enables heap reuse and write primitives suitable for control-flow hijacking or arbitrary kernel memory modification, as with related io_uring linked-timeout UAFs.\nA:H - The double-put underflows request refs and can free or corrupt the object while still in use, reliably causing kernel warnings, oopses, or crashes (and worse under exploitation)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:46:08.931Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86"
        },
        {
          "url": "https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82"
        }
      ],
      "title": "io_uring: fix link timeout refs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47124",
    "datePublished": "2024-03-15T20:14:29.605Z",
    "dateReserved": "2024-03-04T18:12:48.839Z",
    "dateUpdated": "2026-08-05T08:46:08.931Z",
    "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

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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.
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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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