{"id":"CVE-2025-39878","title":"ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix crash after fscrypt_encrypt_pagecache_blocks() error\n\nThe function move_dirty_folio_in_page_array() was created by commit\nce80b76dd327 (\"ceph: introduce ceph_…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"adp","vendor":"Linux","product":"Linux","affected":["Linux >= 0f2b2b7cacf888229cec19126e6791b11fb35f32 < 4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4","Linux >= ce80b76dd32764cc914975777e058d4fae4f0ea0 < dd1616ecbea920d228c56729461ed223cc501425","Linux >= ce80b76dd32764cc914975777e058d4fae4f0ea0 < 249e0a47cdb46bb9eae65511c569044bd8698d7d","Linux 6.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-01-14T19:25:07.166494Z"},"published":"2025-09-23","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:37:31.515Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39878","references":[{"url":"https://git.kernel.org/stable/c/4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4"},{"url":"https://git.kernel.org/stable/c/dd1616ecbea920d228c56729461ed223cc501425"},{"url":"https://git.kernel.org/stable/c/249e0a47cdb46bb9eae65511c569044bd8698d7d"}],"tags":["cve.org"],"epss":0.00187,"epssPercentile":0.0824,"ingestedAt":"2026-10-21T12:48:53.686Z","slug":"CVE-2025-39878","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix crash after fscrypt_encrypt_pagecache_blocks() error\n\nThe function move_dirty_folio_in_page_array() was created by commit\nce80b76dd327 (\"ceph: introduce ceph_process_folio_batch() method\") by\nmoving code from ceph_writepages_start() to this function.\n\nThis new function is supposed to return an error code which is checked\nby the caller (now ceph_process_folio_batch()), and on error, the\ncaller invokes redirty_page_for_writepage() and then breaks from the\nloop.\n\nHowever, the refactoring commit has gone wrong, and it by accident, it\nalways returns 0 (= success) because it first NULLs the pointer and\nthen returns PTR_ERR(NULL) which is always 0.  This means errors are\nsilently ignored, leaving NULL entries in the page array, which may\nlater crash the kernel.\n\nThe simple solution is to call PTR_ERR() before clearing the pointer.\n\n## Affected\n\n- `Linux >= 0f2b2b7cacf888229cec19126e6791b11fb35f32 < 4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4`\n- `Linux >= ce80b76dd32764cc914975777e058d4fae4f0ea0 < dd1616ecbea920d228c56729461ed223cc501425`\n- `Linux >= ce80b76dd32764cc914975777e058d4fae4f0ea0 < 249e0a47cdb46bb9eae65511c569044bd8698d7d`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}