What is CVE-2026-89545?

CVE-2026-89545 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 3.19 onward and patched in 6.12.111, 6.18.50, 7.2.4 and others. CVE-2026-89545 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-89545?

CVE-2026-89545 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-2026-89545?

Yes, CVE-2026-89545 has been patched. Fixed versions include 6.12.111, 6.18.50, 7.2.4 and others. If you are running Linux kernel 3.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-89545 actively exploited?

CVE-2026-89545 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-89545

High

In the Linux kernel, the following vulnerability has been resolved: sunrpc: defer rq_argp and rq_resp free until after RCU grace period svc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously via kfree(), but defers the rqstp struct free via kfree_rcu(). After svc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is a window where RCU readers that started before list_del_rcu() can still traverse the thread list and find the rqstp. These readers (e.g. nfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has already been freed — a use-after-free. Fix this by moving the kfree of rq_argp and rq_resp into an explicit call_rcu() callback alongside the struct free. Resources not accessed by RCU readers (bvec, buffer pages, scratch folio, auth_data) remain synchronously freed.

Package Linux Kernel

Published 2026-09-11

Last modified 2026-09-21

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 3.19 and later are affected. Fixed in 6.12.111, 6.18.50, 7.2.4, 7.3-rc1 and their respective stable series.

Affected from

≥ 3.19

Fixed in

✓ 6.12.111 6.12.x ✓ 6.18.50 6.18.x ✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

4 total

Details

CVE ID CVE-2026-89545

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-09-11

Modified 2026-09-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-89545?

CVE-2026-89545 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 3.19 onward and has been patched in 6.12.111, 6.18.50, 7.2.4 and others. CVE-2026-89545 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-89545?

CVE-2026-89545 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-2026-89545?

Yes. CVE-2026-89545 has been patched. Fixed versions include 6.12.111, 6.18.50, 7.2.4 and others. If you are running Linux kernel 3.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-89545 actively exploited?

No. CVE-2026-89545 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.