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CVE-2023-54306 (GCVE-0-2023-54306)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:23 – Updated: 2026-08-05 09:19
VLAI
Title
net: tls: avoid hanging tasks on the tx_lock
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tls: avoid hanging tasks on the tx_lock syzbot sent a hung task report and Eric explains that adversarial receiver may keep RWIN at 0 for a long time, so we are not guaranteed to make forward progress. Thread which took tx_lock and went to sleep may not release tx_lock for hours. Use interruptible sleep where possible and reschedule the work if it can't take the lock. Testing: existing selftest passes
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < bde541a57b4204d0a800afbbd3d1c06c9cdb133f (git)
Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < 7123a4337bf73132bbfb5437e4dc83ba864a9a1e (git)
Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < be5d5d0637fd88c18ee76024bdb22649a1de00d6 (git)
Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < 1f800f6aae57d2d8f63d32fff383017cbc11cf65 (git)
Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < ccf1ccdc5926907befbe880b562b2a4b5f44c087 (git)
Affected: 79ffe6087e9145d2377385cac48d0d6a6b4225a5 , < f3221361dc85d4de22586ce8441ec2c67b454f5d (git)
Affected: c8d6817345f4ba228d07380e571676405e112872 (git)
Affected: 5.3.11 , < 5.4 (semver)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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        }
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              "value": "AV:N - The condition that causes the tx_lock holder to sleep indefinitely is a zero TCP receive window advertised by the remote TLS peer, so a remote attacker on the network triggers the hang purely through TCP-level behavior against a kTLS-using service (nginx/OpenSSL kTLS, NFS-over-TLS tlshd, etc.). Per kernel scoring guidance, net/tls bugs driven by a remote peer are Network.\nAC:L - The attacker deterministically creates and holds the zero-window condition simply by not reading from the socket; there is no race to win, no memory-layout dependency, and no condition outside the attacker\u0027s control. A single sender is sufficient because the partial-send path itself schedules tx_work, which then blocks a kworker on the mutex.\nPR:N - The attacker is just an ordinary TLS peer of the victim service and needs no credentials on the target; for a public HTTPS/TLS endpoint the kTLS session is established with no authentication. No local account or capability on the victim system is required.\nUI:N - The victim service simply serves data over its normal kTLS send path; no administrator or user action beyond routine operation is needed. The hang occurs automatically once the attacker stalls the window.\nS:U - The impact is confined to the kernel/system that owns the vulnerable socket \u2014 blocked tasks, pinned kworkers, and a potential panic. No security boundary such as a VM, IOMMU, or sandbox is crossed.\nC:N - The defect is a lock-hold/scheduling problem with no out-of-bounds access, no use-after-free, and no uninitialized data exposure. No kernel memory contents are disclosed to the attacker.\nI:N - Nothing is written out of bounds or modified incorrectly; the record data itself is unaffected and eventually sent or discarded normally. There is no write primitive or control-flow influence available from this bug.\nA:H - The uninterruptible mutex waiters (tx_work_handler kworker, concurrent senders, and close()/exit via cancel_delayed_work_sync) become unkillable D-state tasks, tripping the hung-task watchdog and causing a kernel panic on systems with hung_task_panic=1. Even without panic, each stalled connection permanently pins a global system_wq worker (max_active 256), so repeated attacker connections starve the shared workqueue and wedge unrelated kernel work."
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2023-54306",
    "datePublished": "2025-12-30T12:23:39.833Z",
    "dateReserved": "2025-12-30T12:06:44.529Z",
    "dateUpdated": "2026-08-05T09:19:05.796Z",
    "state": "PUBLISHED"
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          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: tls: evitar que las tareas se queden colgadas en el tx_lock\n\nsyzbot envi\u00f3 un informe de tarea colgada y Eric explica que un receptor malintencionado puede mantener RWIN en 0 durante mucho tiempo, por lo que no se garantiza que avancemos. El hilo que tom\u00f3 el tx_lock y se suspendi\u00f3 puede no liberar el tx_lock durante horas. Usar el modo de suspensi\u00f3n interrumpible donde sea posible y reprogramar el trabajo si no puede adquirir el bloqueo.\n\nPruebas: el auto-test existente se supera"
          }
        ],
        "id": "CVE-2023-54306",
        "lastModified": "2026-08-04T11:16:39.737",
        "metrics": {
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                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:51:47+00:00",
      "cve": "CVE-2023-54306",
      "id": "CVE-2023-54306",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: tls: avoid hanging tasks on the tx_lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54306.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:02:44Z",
      "cve": "CVE-2023-54306",
      "id": "CVE-2023-54306",
      "initial_release_date": "2025-12-31T00:26:13Z",
      "product_status:known_affected": "201",
      "product_status:known_not_affected": "359",
      "product_status:recommended": "29",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54306",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54306.json",
      "version": "13"
    }
  }
}



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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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