CVE-2026-23240

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-10. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
EG Score
9.8(medium)
EPSS
38.9%
KEV
Not listed

Published

March 10, 2026

Last Modified

May 20, 2026

Advisory Details (4)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

tls: Fix race condition in tls_sw_cancel_work_tx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de
generic

tls: Fix race condition in tls_sw_cancel_work_tx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b
generic

tls: Fix race condition in tls_sw_cancel_work_tx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4
generic

tls: Fix race condition in tls_sw_cancel_work_tx() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b

Vendor Advisories for CVE-2026-23240(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.12.75—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 132 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-29 14:23 UTCOSV refresh
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  31. 2026-06-12 04:31 UTCEG score recompute
  32. 2026-06-12 04:31 UTCGHSA enrichment
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  37. 2026-06-10 22:49 UTCGHSA enrichment
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  40. 2026-06-10 18:35 UTCGHSA enrichment
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  43. 2026-06-10 10:59 UTCGHSA enrichment
  44. 2026-06-10 06:18 UTCEG score recompute
  45. 2026-06-10 06:18 UTCGHSA enrichment
  46. 2026-06-10 01:55 UTCEG score recompute
  47. 2026-06-10 01:55 UTCGHSA enrichment
  48. 2026-06-09 17:08 UTCEG score recompute
  49. 2026-06-09 17:08 UTCGHSA enrichment
  50. 2026-06-08 14:17 UTCEPSS rescore
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  52. 2026-06-08 07:40 UTCEG score recompute
  53. 2026-06-08 07:40 UTCGHSA enrichment
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  63. 2026-06-07 15:08 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2026-23240?
CVE-2026-23240 is a critical vulnerability published on March 10, 2026. In the Linux kernel, the following vulnerability has been resolved: tls: Fix race condition in tlsswcancelworktx() This issue was discovered during a code audit. After canceldelayedworksync() is called from tlsskprotoclose(), txworkhandler() can still be scheduled from paths such as the Delayed ACK…
When was CVE-2026-23240 disclosed?
CVE-2026-23240 was first published in the National Vulnerability Database on March 10, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23240 actively exploited?
CVE-2026-23240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23240?
CVE-2026-23240 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-23240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23240, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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