CVE-2026-23240: tls: Fix race condition in tls_sw_cancel_work_tx()

highCVSS 7CVE-2026-23240

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23240

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-232400.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-23240	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownMultiple vulnerabilities in SUSE Linux kernel (August 07, 2026)cert-fr-avis
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Servicecert-bund
unknownSUSE Linux Kernel Multiple Vulnerabilitieshkcert

Recent advisories for tls

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-49006: By accessing unencrypted information in the device firmware, an attacker can obtain credential…nvd · 2026-08-07
mediumCVE-2022-46174: Race condition during concurrent TLS mounts in efs-utilsmsrc · 2026-08-06
highCVE-2026-55953: TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authenticat…msrc · 2026-08-06
highCVE-2024-26800: tls: fix use-after-free on failed backlog decryptionmsrc · 2026-08-06
mediumCVE-2026-46917: Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition…msrc · 2026-08-06
mediumCVE-2024-53091: bpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rxmsrc · 2026-08-06