What is CVE-2024-36881?

CVE-2024-36881 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.19.6 onward and patched in 6.6.31, 6.8.10 and 6.9. CVE-2024-36881 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2024-36881?

CVE-2024-36881 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-2024-36881?

Yes, CVE-2024-36881 has been patched. Fixed versions include 6.6.31, 6.8.10 and 6.9. If you are running Linux kernel 5.19.6 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2024-36881 actively exploited?

CVE-2024-36881 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2024-36881

Medium

In the Linux kernel, the following vulnerability has been resolved: mm/userfaultfd: reset ptes when close() for wr-protected ones Userfaultfd unregister includes a step to remove wr-protect bits from all the relevant pgtable entries, but that only covered an explicit UFFDIO_UNREGISTER ioctl, not a close() on the userfaultfd itself. Cover that too. This fixes a WARN trace. The only user visible side effect is the user can observe leftover wr-protect bits even if the user close()ed on an userfaultfd when releasing the last reference of it. However hopefully that should be harmless, and nothing bad should happen even if so. This change is now more important after the recent page-table-check patch we merged in mm-unstable (446dd9ad37d0 ("mm/page_table_check: support userfault wr-protect entries")), as we'll do sanity check on uffd-wp bits without vma context. So it's better if we can 100% guarantee no uffd-wp bit leftovers, to make sure each report will be valid.

Package Linux Kernel

Published 2024-05-30

Last modified 2025-04-01

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 5.19.6, 6.0 and later are affected. Fixed in 6.6.31, 6.8.10, 6.9 and their respective stable series.

Affected from

≥ 5.19.6 ≥ 6.0

Fixed in

✓ 6.6.31 6.6.x ✓ 6.8.10 6.8.x ✓ 6.9

References

3 total

Kernel Git
https://git.kernel.org/stable/c/377f3a9a3d032a52325a5b110379a25dd1ab1931

Patch
Kernel Git
https://git.kernel.org/stable/c/8d8b68a5b0c9fb23d37df06bb273ead38fd5a29d

Patch
Kernel Git
https://git.kernel.org/stable/c/c88033efe9a391e72ba6b5df4b01d6e628f4e734

Patch

Details

CVE ID CVE-2024-36881

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-30

Modified 2025-04-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2024-36881?

CVE-2024-36881 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.19.6 onward and has been patched in 6.6.31, 6.8.10 and 6.9. CVE-2024-36881 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2024-36881?

CVE-2024-36881 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-2024-36881?

Yes. CVE-2024-36881 has been patched. Fixed versions include 6.6.31, 6.8.10 and 6.9. If you are running Linux kernel 5.19.6 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2024-36881 actively exploited?

No. CVE-2024-36881 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.