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GHSA-GCXJ-24RJ-3795

Vulnerability from github – Published: 2024-11-19 03:31 – Updated: 2025-09-19 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix missing locking causing hanging calls

If a call gets aborted (e.g. because kafs saw a signal) between it being queued for connection and the I/O thread picking up the call, the abort will be prioritised over the connection and it will be removed from local->new_client_calls by rxrpc_disconnect_client_call() without a lock being held. This may cause other calls on the list to disappear if a race occurs.

Fix this by taking the client_call_lock when removing a call from whatever list its ->wait_link happens to be on.

Severity

4.7 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-50294"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-19T02:16:31Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix missing locking causing hanging calls\n\nIf a call gets aborted (e.g. because kafs saw a signal) between it being\nqueued for connection and the I/O thread picking up the call, the abort\nwill be prioritised over the connection and it will be removed from\nlocal-\u003enew_client_calls by rxrpc_disconnect_client_call() without a lock\nbeing held.  This may cause other calls on the list to disappear if a race\noccurs.\n\nFix this by taking the client_call_lock when removing a call from whatever\nlist its -\u003ewait_link happens to be on.",
  "id": "GHSA-gcxj-24rj-3795",
  "modified": "2025-09-19T21:31:15Z",
  "published": "2024-11-19T03:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50294"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/996a7208dadbf2cdda8d51444d5ee1fdd1ccbc92"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1fdb0bb3b6513f5bd26f92369fd6ac1a2422d8b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc9de52de38f656399d2ce40f7349a6b5f86e787"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-50294 (GCVE-0-2024-50294)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2026-08-05 11:43

Title

rxrpc: Fix missing locking causing hanging calls

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix missing locking causing hanging calls If a call gets aborted (e.g. because kafs saw a signal) between it being queued for connection and the I/O thread picking up the call, the abort will be prioritised over the connection and it will be removed from local->new_client_calls by rxrpc_disconnect_client_call() without a lock being held. This may cause other calls on the list to disappear if a race occurs. Fix this by taking the client_call_lock when removing a call from whatever list its ->wait_link happens to be on.

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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 20:14 UTC

CWE

CWE-667 - Improper Locking

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/996a7208dadbf2cdd…
https://git.kernel.org/stable/c/b1fdb0bb3b6513f5b…
https://git.kernel.org/stable/c/fc9de52de38f65639…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9d35d880e0e4a3ab32d8c12f9e4d76198aadd42d , < 996a7208dadbf2cdda8d51444d5ee1fdd1ccbc92 (git) Affected: 9d35d880e0e4a3ab32d8c12f9e4d76198aadd42d , < b1fdb0bb3b6513f5bd26f92369fd6ac1a2422d8b (git) Affected: 9d35d880e0e4a3ab32d8c12f9e4d76198aadd42d , < fc9de52de38f656399d2ce40f7349a6b5f86e787 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.61 , ≤ 6.6.* (semver) Unaffected: 6.11.8 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 4.7,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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              "content": {
                "id": "CVE-2024-50294",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T20:14:11.422504Z",
                "version": "2.0.3"
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        {
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          "versions": [
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              "version": "6.2"
            },
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                {
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        }
      ],
      "metrics": [
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              "value": "AV:L - The race is driven entirely by local syscalls on an AF_RXRPC socket \u2014 sendmsg() to queue client calls on local-\u003enew_client_calls plus an RXRPC_ABORT cmsg/signal/close to trigger the unlocked list_del_init(). A call in this window has no cid, no connection and is not on peer-\u003eerror_targets, so no received packet or ICMP error can reach it.\nAC:L - The attacker owns both sides of the race: one thread spams client-call creation (locked list_add_tail) while another aborts calls still in RXRPC_CALL_CLIENT_AWAIT_CONN (unlocked list_del_init), and it can be retried in a tight loop with the I/O thread kept busy to widen the window. AF_RXRPC is built as a module in major distros and autoloads on socket creation.\nPR:L - There are no capable()/CAP_* checks anywhere in net/rxrpc, and creating an AF_RXRPC socket requires no privilege (the module autoloads via net-pf-33). Any unprivileged local user can open the socket and drive both sides of the race.\nUI:N - The attacker performs every step itself via its own socket; no victim action, mount, or file access is required.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority \u2014 no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The list corruption can leave a freed rxrpc_call still linked into local-\u003enew_client_calls after rxrpc_disconnect_call() drops the io_thread reference, and rxrpc_cleanup_call()/rxrpc_destroy_call() never unlink wait_link; the I/O thread then reads that freed object (call-\u003ebundle, wait_link pointers), a use-after-free read leveragable for kernel memory disclosure.\nI:H - The same stale link gives use-after-free writes \u2014 list_move_tail() and rxrpc_activate_one_channel() store into the freed/reused object (call-\u003econn, call-\u003ecid, call-\u003ecall_id, wake_up(\u0026call-\u003ewaitq)) \u2014 and the corrupted prev-\u003enext = new store writes an attacker-influenced pointer into groomable memory, a control-flow-hijack-capable primitive.\nA:H - The documented symptom is calls silently vanishing from the list and hanging forever with sendmsg blocked in rxrpc_wait_to_be_connected(); the corrupted head can also spin rxrpc_connect_client_calls()\u0027s loop or oops the rxrpc I/O thread, killing every call on that local endpoint including the in-kernel AFS client."
            }
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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.

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.

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GHSA-GCXJ-24RJ-3795

CVE-2024-50294 (GCVE-0-2024-50294)

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