CVE-2026-23240

Advisory lineage Upstream: 0 Downstream: 8
Analyzed
Published: 10 Mar 2026, 17:28
Last modified:11 May 2026, 22:03

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (cve.org)
EPSS Score
0.49% LOW
0% probability +0.44%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

10 Mar 2026, 17:28
Published
Vulnerability first disclosed
11 May 2026, 22:03
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.49%• Percentile: 39%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Systems

  • linux•linux

    ≥ f87e62d45e51b12d48d2cb46b5cde8f83b866bc4, < a5de36d6cee74a92c1a21b260bc507e64bc451de | ≥ f87e62d45e51b12d48d2cb46b5cde8f83b866bc4, < 854cd32bc74fe573353095e90958490e4e4d641b | ≥ f87e62d45e51b12d48d2cb46b5cde8f83b866bc4, < 17153f154f80be2b47ebf52840f2d8f724eb2f3b | ≥ f87e62d45e51b12d48d2cb46b5cde8f83b866bc4, < 7bb09315f93dce6acc54bf59e5a95ba7365c2be4 | 5.3

  • linux•linux kernel

    ≥ 5.3.1, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6 | 5.3 | 5.3:rc4 | 5.3:rc5 | 5.3:rc6 | 5.3:rc7 | 5.3:rc8 | 7.0:rc1

References (4)