CVE-2026-23240

CRITICAL EPSS 38.5%
Published Mar 10, 20263mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Mar 10, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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().

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
38.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.3.1  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.16
linuxlinux_kernel*≥6.19  –  <6.19.6
linuxlinux_kernel5.3any
linuxlinux_kernel5.3any
linuxlinux_kernel5.3any
linuxlinux_kernel5.3any
linuxlinux_kernel5.3any
linuxlinux_kernel5.3any
linuxlinux_kernel7.0any

References 4

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

Remediation

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