CVE-2025-39878 (GCVE-0-2025-39878)
Vulnerability from cvelistv5
Published
2025-09-23 06:00
Modified
2026-10-21 12:37
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0f2b2b7cacf888229cec19126e6791b11fb35f32
Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
Version: ce80b76dd32764cc914975777e058d4fae4f0ea0
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