CVE-2026-23240

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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().

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

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

20 May 2026, 19:30

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b - () https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b - Patch
References () https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4 - () https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4 - Patch
References () https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b - () https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b - Patch
References () https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de - () https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de - Patch
First Time Linux linux Kernel
Linux
CWE CWE-362
CPE cpe:2.3:o:linux:linux_kernel:5.3:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.3:rc7:*:*:*:*:*:*

02 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: tls: Corrección de condición de carrera en tls_sw_cancel_work_tx() Este problema fue descubierto durante una auditoría de código. Después de que se llama a cancel_delayed_work_sync() desde tls_sk_proto_close(), tx_work_handler() aún 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. El siguiente es un escenario de condición de carrera simple: 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); Para prevenir esta condición de carrera, cancel_delayed_work_sync() es reemplazado por disable_delayed_work_sync().

10 Mar 2026, 18:18

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-10 18:18

Updated : 2026-05-20 19:30

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')