CVE-2026-23240

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().

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b	Patch
https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4	Patch
https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b	Patch
https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:5.3:-::::::
	cpe:2.3:o:linux:linux_kernel:5.3:rc4::::::
	cpe:2.3:o:linux:linux_kernel:5.3:rc5::::::
	cpe:2.3:o:linux:linux_kernel:5.3:rc6::::::
	cpe:2.3:o:linux:linux_kernel:5.3:rc7::::::
	cpe:2.3:o:linux:linux_kernel:5.3:rc8::::::
	cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::

History

No history.

Information

Published : 2026-03-10 18:18

Updated : 2026-06-17 10:21

NVD link : CVE-2026-23240

Mitre link : CVE-2026-23240

CVE.ORG link : CVE-2026-23240

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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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, &tx_ctx->tx_bitmask))\n set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);\n cancel_delayed_work_sync(&ctx->tx_work.work);\n schedule_delayed_work(&tx_ctx->tx_work.work, 0);\n\nPara prevenir esta condici\u00f3n de carrera, cancel_delayed_work_sync() es reemplazado por disable_delayed_work_sync()."}], "lastModified": "2026-06-17T10:21:10.067", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2CD7FB69-6705-47EA-9F0D-65B1E859F71E", "versionEndExcluding": "6.12.75", "versionStartIncluding": "5.3.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D036D76E-AC69-4382-B4C1-8EDA1ABB2941"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EBAE804E-3CC3-44C2-B1F5-2DC3EE4FF793"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8721379D-C6BC-43BF-8098-396F32182BEF"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "65AF2469-2B9F-4D4D-8886-2B8BA66D5FDC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "21001886-2C34-45F4-9319-60102B357E64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "999345BA-F820-40B9-A711-32CA9265C289"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}