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Vulnerabilities

Vulnerability · CVE-2025-39878

In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was

Published Sep 23, 2025 · catalog updated Oct 21, 2026 · Linux Linux

Check if you run it

No confirmed exploitation is on record for CVE-2025-39878. EPSS is 0.15%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.15%
Remediation
Version ranges on file
Affected products
cpe linux/linux kernel · vendor Linux Linux 0f2b2b7cacf888229cec19126e6791b11fb35f32 <4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4

In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving code from ceph_writepages_start() to this function. This new function is supposed to return an error code which is checked by the caller (now ceph_process_folio_batch()), and on error, the caller invokes redirty_page_for_writepage() and then breaks from the loop. However, the refactoring commit has gone wrong, and it by accident, it always returns 0 (= success) because it first NULLs the pointer and then returns PTR_ERR(NULL) which is always 0. This means errors are silently ignored, leaving NULL entries in the page array, which may later crash the kernel. The simple solution is to call PTR_ERR() before clearing the pointer.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernel6.17
  • cpe linux/linux kernel< 6.16.8
  • vendor Linux Linux 0f2b2b7cacf888229cec19126e6791b11fb35f32 <4a918f04cf97b2436a8dfe5cb51bb33f8e8831f40f2b2b7cacf888229cec19126e6791b11fb35f32 <4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4

How to fix CVE-2025-39878

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-39878. EPSS is 0.15%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 6.17; linux/linux kernel < 6.16.8; Linux Linux 0f2b2b7cacf888229cec19126e6791b11fb35f32 <4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4 0f2b2b7cacf888229cec19126e6791b11fb35f32 <4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 0.15%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 23, 2025 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving code from ceph_writepages_start() to this function. This new function is supposed to return an error code which is checked b

  2. Oct 21, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving code from ceph_writepages_start() to this function. This new function is supposed to return an error code which is checked b

Sources

  • CVE.orgVulnerability recordCVE-2025-39878

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-39878

    30-day exploitation probability 0.15%

    first.org
  • EUVDVulnerability recordEUVD-2025-30854

    In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving code

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-39878

    In the Linux kernel, the following vulnerability has been resolved: ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error The function move_dirty_folio_in_page_array() was created by commit ce80b76dd327 ("ceph: introduce ceph_process_folio_batch() method") by moving co

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.