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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tls_sw_cancel_work_tx函数存在竞争条件，可能导致释放后重用。

CVSS 9.8 · Critical EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f87e62d45e51b12d48d2cb46b5cde8f83b866bc4< a5de36d6cee74a92c1a21b260bc507e64bc451de affected
f87e62d45e51b12d48d2cb46b5cde8f83b866bc4< 854cd32bc74fe573353095e90958490e4e4d641b affected
f87e62d45e51b12d48d2cb46b5cde8f83b866bc4< 17153f154f80be2b47ebf52840f2d8f724eb2f3b affected
f87e62d45e51b12d48d2cb46b5cde8f83b866bc4< 7bb09315f93dce6acc54bf59e5a95ba7365c2be4 affected
5.3 affected
< 5.3 unaffected
6.12.75≤ 6.12.* unaffected
6.18.16≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-23240

Vulnerability Information
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Vulnerability Title
tls: Fix race condition in tls_sw_cancel_work_tx()
Source: CVE Program / CVE List V5
Vulnerability Description
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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tls_sw_cancel_work_tx函数存在竞争条件，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 ~ a5de36d6cee74a92c1a21b260bc507e64bc451de -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-23240

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III. Intelligence Information for CVE-2026-23240

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Patches & Fixes for CVE-2026-23240 (4)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23240

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