CVE-2026-23240

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().

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b
• https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4
• https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b
• https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de
• https://www.suse.com/security/cve/CVE-2026-23240.html
• https://security-tracker.debian.org/tracker/CVE-2026-23240

CWEs

CWE-362