Vulnerability-Lookup

CVE-2026-23240 (GCVE-0-2026-23240)

Vulnerability from cvelistv5 – Published: 2026-03-10 17:28 – Updated: 2026-03-10 17:28

Title

tls: Fix race condition in tls_sw_cancel_work_tx()

Summary

In the Linux kernel, the following vulnerability has been resolved: tls: Fix race condition in tls_sw_cancel_work_tx() This issue was discovered during a code audit. After cancel_delayed_work_sync() is called from tls_sk_proto_close(), tx_work_handler() can still be scheduled from paths such as the Delayed ACK handler or ksoftirqd. As a result, the tx_work_handler() worker may dereference a freed TLS object. The following is a simple race scenario: cpu0 cpu1 tls_sk_proto_close() tls_sw_cancel_work_tx() tls_write_space() tls_sw_write_space() if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask); cancel_delayed_work_sync(&ctx->tx_work.work); schedule_delayed_work(&tx_ctx->tx_work.work, 0); To prevent this race condition, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/a5de36d6cee74a92c…
	https://git.kernel.org/stable/c/854cd32bc74fe5733…
	https://git.kernel.org/stable/c/17153f154f80be2b4…
	https://git.kernel.org/stable/c/7bb09315f93dce6ac…

Impacted products

Vendor

Product

Version

Linux

Affected: f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 , < a5de36d6cee74a92c1a21b260bc507e64bc451de (git)
Affected: f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 , < 854cd32bc74fe573353095e90958490e4e4d641b (git)
Affected: f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 , < 17153f154f80be2b47ebf52840f2d8f724eb2f3b (git)
Affected: f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 , < 7bb09315f93dce6acc54bf59e5a95ba7365c2be4 (git)

Linux

Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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          "programFiles": [
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
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                  "vulnerable": true
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Fix race condition in tls_sw_cancel_work_tx()\n\nThis issue was discovered during a code audit.\n\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\ntx_work_handler() can still be scheduled from paths such as the\nDelayed ACK handler or ksoftirqd.\nAs a result, the tx_work_handler() worker may dereference a freed\nTLS object.\n\nThe following is a simple race scenario:\n\n          cpu0                         cpu1\n\ntls_sk_proto_close()\n  tls_sw_cancel_work_tx()\n                                 tls_write_space()\n                                   tls_sw_write_space()\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, \u0026tx_ctx-\u003etx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, \u0026ctx-\u003etx_bitmask);\n    cancel_delayed_work_sync(\u0026ctx-\u003etx_work.work);\n                                     schedule_delayed_work(\u0026tx_ctx-\u003etx_work.work, 0);\n\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-10T17:28:27.371Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23240",
    "datePublished": "2026-03-10T17:28:27.371Z",
    "dateReserved": "2026-01-13T15:37:45.989Z",
    "dateUpdated": "2026-03-10T17:28:27.371Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23240\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-10T18:18:13.533\",\"lastModified\":\"2026-03-11T13:53:20.707\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntls: Fix race condition in tls_sw_cancel_work_tx()\\n\\nThis issue was discovered during a code audit.\\n\\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\\ntx_work_handler() can still be scheduled from paths such as the\\nDelayed ACK handler or ksoftirqd.\\nAs a result, the tx_work_handler() worker may dereference a freed\\nTLS object.\\n\\nThe following is a simple race scenario:\\n\\n          cpu0                         cpu1\\n\\ntls_sk_proto_close()\\n  tls_sw_cancel_work_tx()\\n                                 tls_write_space()\\n                                   tls_sw_write_space()\\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, \u0026tx_ctx-\u003etx_bitmask))\\n    set_bit(BIT_TX_SCHEDULED, \u0026ctx-\u003etx_bitmask);\\n    cancel_delayed_work_sync(\u0026ctx-\u003etx_work.work);\\n                                     schedule_delayed_work(\u0026tx_ctx-\u003etx_work.work, 0);\\n\\nTo prevent this race condition, cancel_delayed_work_sync() is\\nreplaced with disable_delayed_work_sync().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

MSRC_CVE-2026-23240

Vulnerability from csaf_microsoft - Published: 2026-03-02 00:00 - Updated: 2026-03-12 01:01

Summary

tls: Fix race condition in tls_sw_cancel_work_tx()

Notes

Additional Resources

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer

The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-23240 tls: Fix race condition in tls_sw_cancel_work_tx() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-23240.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "tls: Fix race condition in tls_sw_cancel_work_tx()",
    "tracking": {
      "current_release_date": "2026-03-12T01:01:42.000Z",
      "generator": {
        "date": "2026-03-12T07:02:15.639Z",
        "engine": {
          "name": "MSRC Generator",
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      "id": "msrc_CVE-2026-23240",
      "initial_release_date": "2026-03-02T00:00:00.000Z",
      "revision_history": [
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          "date": "2026-03-12T01:01:42.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
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      "status": "final",
      "version": "1"
    }
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  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 6.6.126.1-1",
                "product": {
                  "name": "azl3 kernel 6.6.126.1-1",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
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        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
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  "vulnerabilities": [
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      "notes": [
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          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
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        ]
      },
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        {
          "category": "self",
          "summary": "CVE-2026-23240 tls: Fix race condition in tls_sw_cancel_work_tx() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-23240.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-03-12T01:01:42.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
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          ]
        }
      ],
      "title": "tls: Fix race condition in tls_sw_cancel_work_tx()"
    }
  ]
}

GHSA-C96V-VVF3-2P7R

Vulnerability from github – Published: 2026-03-10 18:31 – Updated: 2026-03-10 18:31

Details

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

tls: Fix race condition in tls_sw_cancel_work_tx()

This issue was discovered during a code audit.

After cancel_delayed_work_sync() is called from tls_sk_proto_close(), tx_work_handler() can still be scheduled from paths such as the Delayed ACK handler or ksoftirqd. As a result, the tx_work_handler() worker may dereference a freed TLS object.

The following is a simple race scenario:

      cpu0                         cpu1

tls_sk_proto_close() tls_sw_cancel_work_tx() tls_write_space() tls_sw_write_space() if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask); cancel_delayed_work_sync(&ctx->tx_work.work); schedule_delayed_work(&tx_ctx->tx_work.work, 0);

To prevent this race condition, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-23240"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-10T18:18:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Fix race condition in tls_sw_cancel_work_tx()\n\nThis issue was discovered during a code audit.\n\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\ntx_work_handler() can still be scheduled from paths such as the\nDelayed ACK handler or ksoftirqd.\nAs a result, the tx_work_handler() worker may dereference a freed\nTLS object.\n\nThe following is a simple race scenario:\n\n          cpu0                         cpu1\n\ntls_sk_proto_close()\n  tls_sw_cancel_work_tx()\n                                 tls_write_space()\n                                   tls_sw_write_space()\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, \u0026tx_ctx-\u003etx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, \u0026ctx-\u003etx_bitmask);\n    cancel_delayed_work_sync(\u0026ctx-\u003etx_work.work);\n                                     schedule_delayed_work(\u0026tx_ctx-\u003etx_work.work, 0);\n\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync().",
  "id": "GHSA-c96v-vvf3-2p7r",
  "modified": "2026-03-10T18:31:19Z",
  "published": "2026-03-10T18:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23240"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

FKIE_CVE-2026-23240

Vulnerability from fkie_nvd - Published: 2026-03-10 18:18 - Updated: 2026-03-11 13:53

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Fix race condition in tls_sw_cancel_work_tx()\n\nThis issue was discovered during a code audit.\n\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\ntx_work_handler() can still be scheduled from paths such as the\nDelayed ACK handler or ksoftirqd.\nAs a result, the tx_work_handler() worker may dereference a freed\nTLS object.\n\nThe following is a simple race scenario:\n\n          cpu0                         cpu1\n\ntls_sk_proto_close()\n  tls_sw_cancel_work_tx()\n                                 tls_write_space()\n                                   tls_sw_write_space()\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, \u0026tx_ctx-\u003etx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, \u0026ctx-\u003etx_bitmask);\n    cancel_delayed_work_sync(\u0026ctx-\u003etx_work.work);\n                                     schedule_delayed_work(\u0026tx_ctx-\u003etx_work.work, 0);\n\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntls: Correcci\u00f3n de condici\u00f3n de carrera en tls_sw_cancel_work_tx()\n\nEste problema fue descubierto durante una auditor\u00eda de c\u00f3digo.\n\nDespu\u00e9s de que se llama a cancel_delayed_work_sync() desde tls_sk_proto_close(), tx_work_handler() a\u00fan puede ser programado desde rutas como el gestor de ACK Retrasado o ksoftirqd. Como resultado, el trabajador tx_work_handler() puede desreferenciar un objeto TLS liberado.\n\nEl siguiente es un escenario de condici\u00f3n de carrera simple:\n\n          cpu0                         cpu1\n\ntls_sk_proto_close()\n  tls_sw_cancel_work_tx()\n                                 tls_write_space()\n                                   tls_sw_write_space()\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, \u0026amp;tx_ctx-\u0026gt;tx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, \u0026amp;ctx-\u0026gt;tx_bitmask);\n    cancel_delayed_work_sync(\u0026amp;ctx-\u0026gt;tx_work.work);\n                                     schedule_delayed_work(\u0026amp;tx_ctx-\u0026gt;tx_work.work, 0);\n\nPara prevenir esta condici\u00f3n de carrera, cancel_delayed_work_sync() es reemplazado por disable_delayed_work_sync()."
    }
  ],
  "id": "CVE-2026-23240",
  "lastModified": "2026-03-11T13:53:20.707",
  "metrics": {},
  "published": "2026-03-10T18:18:13.533",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-23240 (GCVE-0-2026-23240)

MSRC_CVE-2026-23240

GHSA-C96V-VVF3-2P7R

FKIE_CVE-2026-23240

Tags

Sightings

Nomenclature