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().
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.3.1, < 6.12.75 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3bPatch
- https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4Patch
- https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641bPatch
- https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451dePatch
FAQ
What is CVE-2026-23240?
CVE-2026-23240 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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(...
How severe is CVE-2026-23240?
CVE-2026-23240 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-23240?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.