What is CVE-2026-23259?

CVE-2026-23259 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.10 onward and patched in 6.18.10 and 6.19. CVE-2026-23259 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23259?

CVE-2026-23259 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-23259?

Yes, CVE-2026-23259 has been patched. Fixed versions include 6.18.10 and 6.19. If you are running Linux kernel 6.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23259 actively exploited?

CVE-2026-23259 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23259

Medium

In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: free potentially allocated iovec on cache put failure If a read/write request goes through io_req_rw_cleanup() and has an allocated iovec attached and fails to put to the rw_cache, then it may end up with an unaccounted iovec pointer. Have io_rw_recycle() return whether it recycled the request or not, and use that to gauge whether to free a potential iovec or not.

Package Linux Kernel

Published 2026-03-18

Last modified 2026-05-29

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.10 and later are affected. Fixed in 6.18.10, 6.19 and their respective stable series.

Affected from

≥ 6.10

Fixed in

✓ 6.18.10 6.18.x ✓ 6.19

References

The following references provide additional information about CVE-2026-23259 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4b9748055457ac3a0710bf210c229d01ea1b01b9
Patch

Details

CVE ID CVE-2026-23259

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-03-18

Modified 2026-05-29

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23259?

CVE-2026-23259 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.10 onward and has been patched in 6.18.10 and 6.19. CVE-2026-23259 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23259?

CVE-2026-23259 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-23259?

Yes — CVE-2026-23259 has been patched. Fixed versions include 6.18.10 and 6.19. If you are running Linux kernel 6.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23259 actively exploited?

No — CVE-2026-23259 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.