What is CVE-2026-90434?

CVE-2026-90434 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 2.6.33 onward and patched in 5.10.270, 5.15.221, 6.1.188 and others. CVE-2026-90434 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-90434?

CVE-2026-90434 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-90434?

Yes, CVE-2026-90434 has been patched. Fixed versions include 5.10.270, 5.15.221, 6.1.188 and others. If you are running Linux kernel 2.6.33 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-90434 actively exploited?

CVE-2026-90434 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-90434

In the Linux kernel, the following vulnerability has been resolved: isofs: release zisofs block pointer buffer head zisofs_fill_pages() reads the compressed block pointer table. The error paths release the current buffer_head, the loop also releases the old buffer_head when it advances. However, the success path leaves the last buffer_head referenced. Release it before returning success.

Package Linux Kernel

Published 2026-09-17

Last modified 2026-09-17

Patch available

Yes

Affected versions

Linux kernel versions 2.6.33 and later are affected. Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3-rc1 and their respective stable series.

Affected from

≥ 2.6.33

Fixed in

✓ 5.10.270 5.10.x ✓ 5.15.221 5.15.x ✓ 6.1.188 6.1.x ✓ 6.6.157 6.6.x ✓ 6.12.110 6.12.x ✓ 6.18.52 6.18.x ✓ 7.2.6 7.2.x ✓ 7.3-rc1

References

8 total

Showing 5 of 8 references View all on NVD

Frequently asked questions

What is CVE-2026-90434?

CVE-2026-90434 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.33 onward and has been patched in 5.10.270, 5.15.221, 6.1.188 and others. CVE-2026-90434 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-90434?

Yes. CVE-2026-90434 has been patched. Fixed versions include 5.10.270, 5.15.221, 6.1.188 and others. If you are running Linux kernel 2.6.33 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-90434 actively exploited?

No. CVE-2026-90434 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.