CVE-2024-35872

Medium

In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix GUP-fast succeeding on secretmem folios folio_is_secretmem() currently relies on secretmem folios being LRU folios, to save some cycles. However, folios might reside in a folio batch without the LRU flag set, or temporarily have their LRU flag cleared. Consequently, the LRU flag is unreliable for this purpose. In particular, this is the case when secretmem_fault() allocates a fresh page and calls filemap_add_folio()->folio_add_lru(). The folio might be added to the per-cpu folio batch and won't get the LRU flag set until the batch was drained using e.g., lru_add_drain(). Consequently, folio_is_secretmem() might not detect secretmem folios and GUP-fast can succeed in grabbing a secretmem folio, crashing the kernel when we would later try reading/writing to the folio, because the folio has been unmapped from the directmap. Fix it by removing that unreliable check.

Package Linux Kernel
Published 2024-05-19
Last modified 2025-09-24
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 5.14 and later are affected. Fixed in 5.15.154, 6.1.85, 6.6.26, 6.8.5, 6.9 and their respective stable series.

Affected from
≥ 5.14
Fixed in
✓ 5.15.154 5.15.x ✓ 6.1.85 6.1.x ✓ 6.6.26 6.6.x ✓ 6.8.5 6.8.x ✓ 6.9

References

5 total

Frequently asked questions

  • What is CVE-2024-35872?

    CVE-2024-35872 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.14 onward and has been patched in 5.15.154, 6.1.85, 6.6.26 and others. CVE-2024-35872 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2024-35872?

    CVE-2024-35872 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-2024-35872?

    Yes. CVE-2024-35872 has been patched. Fixed versions include 5.15.154, 6.1.85, 6.6.26 and others. If you are running Linux kernel 5.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2024-35872 actively exploited?

    No. CVE-2024-35872 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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