What is CVE-2026-90044?

CVE-2026-90044 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 4.0 onward and patched in 6.12.111, 6.18.51, 7.2.5 and others. CVE-2026-90044 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-90044?

CVE-2026-90044 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-2026-90044?

Yes, CVE-2026-90044 has been patched. Fixed versions include 6.12.111, 6.18.51, 7.2.5 and others. If you are running Linux kernel 4.0 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-90044 actively exploited?

CVE-2026-90044 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-90044

High

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix Use-After-Free in AIO error path In ffs_epfile_write_iter() and ffs_epfile_read_iter(), when ffs_epfile_io() fails with an error other than -EIOCBQUEUED, the io_data structure (`p`) is freed. However, for AIO operations, the kiocb cancel function was already armed and kiocb->private was set to `p`. If a concurrent cancel operation (such as sys_io_cancel()) executes after ffs_epfile_io() fails but before the function frees `p`, a Use-After-Free can occur when the cancellation handler accesses the freed pointer. To securely fix this race condition, we must properly un-arm the cancellation. Invoking `kiocb->ki_complete()` does exactly this by acquiring `ctx->ctx_lock` and safely removing the kiocb from the active sequence. In doing so, it ensures that a parallel io_cancel can no longer discover the kiocb, effectively closing the race window. We then return -EIOCBQUEUED to notify the VFS layer that the kiocb has been consumed and it should avoid attempting to complete the request again or triggering subsequent completion handlers.

Package Linux Kernel

Published 2026-09-16

Last modified 2026-09-28

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

Affected versions

Linux kernel versions 4.0 and later are affected. Fixed in 6.12.111, 6.18.51, 7.2.5, 7.3-rc1 and their respective stable series.

Affected from

≥ 4.0

Fixed in

✓ 6.12.111 6.12.x ✓ 6.18.51 6.18.x ✓ 7.2.5 7.2.x ✓ 7.3-rc1

References

4 total

Details

CVE ID CVE-2026-90044

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-09-16

Modified 2026-09-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-90044?

CVE-2026-90044 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.0 onward and has been patched in 6.12.111, 6.18.51, 7.2.5 and others. CVE-2026-90044 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-90044?

CVE-2026-90044 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-2026-90044?

Yes. CVE-2026-90044 has been patched. Fixed versions include 6.12.111, 6.18.51, 7.2.5 and others. If you are running Linux kernel 4.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-90044 actively exploited?

No. CVE-2026-90044 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.