CVE-2026-23240tls: Fix race condition in tls_sw_cancel_work_tx()
Updated under an hour ago ()
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 before a5de36d6cee74a92c1a21b260bc507e64bc451de; from f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 before 854cd32bc74fe573353095e90958490e4e4d641b; from f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 before 17153f154f80be2b47ebf52840f2d8f724eb2f3b; from f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 before 7bb09315f93dce6acc54bf59e5a95ba7365c2be4 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.3.1 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 5.3; 5.3; 5.3; 5.3; 5.3; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451depatch
- https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641bpatch
- https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3bpatch
- https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.