Vulnerability-Lookup

GHSA-F7XX-6PGX-V4HG

Vulnerability from github – Published: 2025-12-30 15:30 – Updated: 2026-08-04 12:34

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2023-54306"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-30T13:16:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: avoid hanging tasks on the tx_lock\n\nsyzbot sent a hung task report and Eric explains that adversarial\nreceiver may keep RWIN at 0 for a long time, so we are not guaranteed\nto make forward progress. Thread which took tx_lock and went to sleep\nmay not release tx_lock for hours. Use interruptible sleep where\npossible and reschedule the work if it can\u0027t take the lock.\n\nTesting: existing selftest passes",
  "id": "GHSA-f7xx-6pgx-v4hg",
  "modified": "2026-08-04T12:34:50Z",
  "published": "2025-12-30T15:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54306"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f800f6aae57d2d8f63d32fff383017cbc11cf65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7123a4337bf73132bbfb5437e4dc83ba864a9a1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bde541a57b4204d0a800afbbd3d1c06c9cdb133f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be5d5d0637fd88c18ee76024bdb22649a1de00d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccf1ccdc5926907befbe880b562b2a4b5f44c087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3221361dc85d4de22586ce8441ec2c67b454f5d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-12-30 12:23 – Updated: 2026-08-05 09:19

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

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/bde541a57b4204d0a…
https://git.kernel.org/stable/c/7123a4337bf73132b…
https://git.kernel.org/stable/c/be5d5d0637fd88c18…
https://git.kernel.org/stable/c/1f800f6aae57d2d8f…
https://git.kernel.org/stable/c/ccf1ccdc5926907be…
https://git.kernel.org/stable/c/f3221361dc85d4de2…

Impacted products

2 products

Vendor	Product	Version
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)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tls/tls_sw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bde541a57b4204d0a800afbbd3d1c06c9cdb133f",
              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
            },
            {
              "lessThan": "7123a4337bf73132bbfb5437e4dc83ba864a9a1e",
              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
            },
            {
              "lessThan": "be5d5d0637fd88c18ee76024bdb22649a1de00d6",
              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
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              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
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            {
              "lessThan": "ccf1ccdc5926907befbe880b562b2a4b5f44c087",
              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
            },
            {
              "lessThan": "f3221361dc85d4de22586ce8441ec2c67b454f5d",
              "status": "affected",
              "version": "79ffe6087e9145d2377385cac48d0d6a6b4225a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c8d6817345f4ba228d07380e571676405e112872",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "5.3.11",
              "versionType": "semver"
            }
          ]
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          "product": "Linux",
          "programFiles": [
            "net/tls/tls_sw.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.235",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.173",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.100",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.235",
                  "versionStartIncluding": "5.4",
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                },
                {
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                },
                {
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                  "versionEndExcluding": "5.15.100",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.18",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.3.11",
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              ],
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: avoid hanging tasks on the tx_lock\n\nsyzbot sent a hung task report and Eric explains that adversarial\nreceiver may keep RWIN at 0 for a long time, so we are not guaranteed\nto make forward progress. Thread which took tx_lock and went to sleep\nmay not release tx_lock for hours. Use interruptible sleep where\npossible and reschedule the work if it can\u0027t take the lock.\n\nTesting: existing selftest passes"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:19:05.796Z",
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        {
          "url": "https://git.kernel.org/stable/c/f3221361dc85d4de22586ce8441ec2c67b454f5d"
        }
      ],
      "title": "net: tls: avoid hanging tasks on the tx_lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "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.

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-F7XX-6PGX-V4HG

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

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