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CVE-2025-39878— ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于move_dirty_folio_in_page_array函数错误处理不当，可能导致内核崩溃。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 7

VendorProduct Version RangeStatus
Linux Linux 0f2b2b7cacf888229cec19126e6791b11fb35f32< 4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4 affected
ce80b76dd32764cc914975777e058d4fae4f0ea0< dd1616ecbea920d228c56729461ed223cc501425 affected
ce80b76dd32764cc914975777e058d4fae4f0ea0< 249e0a47cdb46bb9eae65511c569044bd8698d7d affected
6.15 affected
< 6.15 unaffected
6.16.8≤ 6.16.* unaffected
6.17≤ * unaffected
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I. Basic Information for CVE-2025-39878

Vulnerability Information
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Vulnerability Title
ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于move_dirty_folio_in_page_array函数错误处理不当，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0f2b2b7cacf888229cec19126e6791b11fb35f32 ~ 4a918f04cf97b2436a8dfe5cb51bb33f8e8831f4 -
Linux Linux 6.15 -

II. Public POCs for CVE-2025-39878

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III. Intelligence Information for CVE-2025-39878

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Patches & Fixes for CVE-2025-39878 (1)

Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39880 9.8 CRITICAL libceph: fix invalid accesses to ceph_connection_v1_info
CVE-2025-39869 8.4 HIGH dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39882 8.4 HIGH drm/mediatek: fix potential OF node use-after-free
CVE-2025-39888 7.8 HIGH fuse: Block access to folio overlimit
CVE-2025-39872 7.8 HIGH hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39873 7.8 HIGH can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
CVE-2025-39868 7.8 HIGH erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39881 7.8 HIGH kernfs: Fix UAF in polling when open file is released
CVE-2025-39879 ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39887 tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
CVE-2025-39885 ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886 bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883 mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884 btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39877 mm/damon/sysfs: fix use-after-free in state_show()
CVE-2025-39876 net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874 macsec: sync features on RTM_NEWLINK
CVE-2025-39875 igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39871 dmaengine: idxd: Remove improper idxd_free
CVE-2025-39870 dmaengine: idxd: Fix double free in idxd_setup_wqs()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39878

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