What is CVE-2026-43358?

CVE-2026-43358 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.16.4 onward and patched in 6.18.19, 6.19.9 and 7.0. CVE-2026-43358 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43358?

CVE-2026-43358 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-2026-43358?

Yes, CVE-2026-43358 has been patched. Fixed versions include 6.18.19, 6.19.9 and 7.0. If you are running Linux kernel 6.16.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43358 actively exploited?

CVE-2026-43358 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43358

Medium

In the Linux kernel, the following vulnerability has been resolved: btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer() Call rcu_read_lock() before exiting the loop in try_release_subpage_extent_buffer() because there is a rcu_read_unlock() call past the loop. This has been detected by the Clang thread-safety analyzer.

Package Linux Kernel

Published 2026-05-08

Last modified 2026-05-15

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 6.16.4, 6.17 and later are affected. Fixed in 6.18.19, 6.19.9, 7.0 and their respective stable series.

Affected from

≥ 6.16.4 ≥ 6.17

Fixed in

✓ 6.18.19 6.18.x ✓ 6.19.9 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43358 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/35b0c8768e848e1b7e32052db36b5fa59b6a33a1
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5e1ab71f74a1e61f1254dff128a764fdebaec0b8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/b2840e33127ce0eea880504b7f133e780f567a9b
Patch

Details

CVE ID CVE-2026-43358

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-08

Modified 2026-05-15

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43358?

CVE-2026-43358 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.16.4 onward and has been patched in 6.18.19, 6.19.9 and 7.0. CVE-2026-43358 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43358?

CVE-2026-43358 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-2026-43358?

Yes — CVE-2026-43358 has been patched. Fixed versions include 6.18.19, 6.19.9 and 7.0. If you are running Linux kernel 6.16.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43358 actively exploited?

No — CVE-2026-43358 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.