What is CVE-2026-23239?

CVE-2026-23239 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Race Condition flaw (CWE-362), affecting Linux kernel versions from 5.6 onward and patched in 6.12.75, 6.18.16, 6.19.6 and others. CVE-2026-23239 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23239?

CVE-2026-23239 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-23239?

Yes, CVE-2026-23239 has been patched. Fixed versions include 6.12.75, 6.18.16, 6.19.6 and others. If you are running Linux kernel 5.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23239 actively exploited?

CVE-2026-23239 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2026-23239

High

In the Linux kernel, the following vulnerability has been resolved: espintcp: Fix race condition in espintcp_close() This issue was discovered during a code audit. After cancel_work_sync() is called from espintcp_close(), espintcp_tx_work() can still be scheduled from paths such as the Delayed ACK handler or ksoftirqd. As a result, the espintcp_tx_work() worker may dereference a freed espintcp ctx or sk. The following is a simple race scenario: cpu0 cpu1 espintcp_close() cancel_work_sync(&ctx->work); espintcp_write_space() schedule_work(&ctx->work); To prevent this race condition, cancel_work_sync() is replaced with disable_work_sync().

Package Linux Kernel

Published 2026-03-10

Last modified 2026-05-20

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-362

CVE-2026-23239 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.6 and later are affected. Fixed in 6.12.75, 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from

≥ 5.6

Fixed in

✓ 6.12.75 6.12.x ✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

4 total

Kernel Git
https://git.kernel.org/stable/c/022ff7f347588de6e17879a1da6019647b21321b

Patch
Kernel Git
https://git.kernel.org/stable/c/664e9df53226b4505a0894817ecad2c610ab11d8

Patch
Kernel Git
https://git.kernel.org/stable/c/e1512c1db9e8794d8d130addd2615ec27231d994

Patch
Kernel Git
https://git.kernel.org/stable/c/f7ad8b1d0e421c524604d5076b73232093490d5c

Patch

Details

CVE ID CVE-2026-23239

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-03-10

Modified 2026-05-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23239?

CVE-2026-23239 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as a Race Condition flaw (CWE-362) . It affects Linux kernel versions from 5.6 onward and has been patched in 6.12.75, 6.18.16, 6.19.6 and others. CVE-2026-23239 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23239?

CVE-2026-23239 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-23239?

Yes. CVE-2026-23239 has been patched. Fixed versions include 6.12.75, 6.18.16, 6.19.6 and others. If you are running Linux kernel 5.6 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23239 actively exploited?

No. CVE-2026-23239 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.