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CVE-2025-39866— fs: writeback: fix use-after-free in __mark_inode_dirty()

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
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__mark_inode_dirty函数中存在释放后重用问题。

CVSS 7.8 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 0747259d13febfcc838980a63c414c9b920cea6f< e2a14bbae5d8bacaa301362744a110e2be40a3a3 affected
0747259d13febfcc838980a63c414c9b920cea6f< b187c976111960e6e54a6b1fff724f6e3d39406c affected
0747259d13febfcc838980a63c414c9b920cea6f< 1edc2feb9c759a9883dfe81cb5ed231412d8b2e4 affected
0747259d13febfcc838980a63c414c9b920cea6f< bf89b1f87c72df79cf76203f71fbf8349cd5c9de affected
0747259d13febfcc838980a63c414c9b920cea6f< e63052921f1b25a836feb1500b841bff7a4a0456 affected
0747259d13febfcc838980a63c414c9b920cea6f< c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a affected
0747259d13febfcc838980a63c414c9b920cea6f< d02d2c98d25793902f65803ab853b592c7a96b29 affected
4.2 affected
… +8 more rows
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I. Basic Information for CVE-2025-39866

Vulnerability Information
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Vulnerability Title
fs: writeback: fix use-after-free in __mark_inode_dirty()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fs: writeback: fix use-after-free in __mark_inode_dirty() An use-after-free issue occurred when __mark_inode_dirty() get the bdi_writeback that was in the progress of switching. CPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1 ...... pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mark_inode_dirty+0x124/0x418 lr : __mark_inode_dirty+0x118/0x418 sp : ffffffc08c9dbbc0 ........ Call trace: __mark_inode_dirty+0x124/0x418 generic_update_time+0x4c/0x60 file_modified+0xcc/0xd0 ext4_buffered_write_iter+0x58/0x124 ext4_file_write_iter+0x54/0x704 vfs_write+0x1c0/0x308 ksys_write+0x74/0x10c __arm64_sys_write+0x1c/0x28 invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xc0/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x40/0xe4 el0t_64_sync_handler+0x120/0x12c el0t_64_sync+0x194/0x198 Root cause is: systemd-random-seed kworker ---------------------------------------------------------------------- ___mark_inode_dirty inode_switch_wbs_work_fn spin_lock(&inode->i_lock); inode_attach_wb locked_inode_to_wb_and_lock_list get inode->i_wb spin_unlock(&inode->i_lock); spin_lock(&wb->list_lock) spin_lock(&inode->i_lock) inode_io_list_move_locked spin_unlock(&wb->list_lock) spin_unlock(&inode->i_lock) spin_lock(&old_wb->list_lock) inode_do_switch_wbs spin_lock(&inode->i_lock) inode->i_wb = new_wb spin_unlock(&inode->i_lock) spin_unlock(&old_wb->list_lock) wb_put_many(old_wb, nr_switched) cgwb_release old wb released wb_wakeup_delayed() accesses wb, then trigger the use-after-free issue Fix this race condition by holding inode spinlock until wb_wakeup_delayed() finished.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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__mark_inode_dirty函数中存在释放后重用问题。
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 0747259d13febfcc838980a63c414c9b920cea6f ~ e2a14bbae5d8bacaa301362744a110e2be40a3a3 -
Linux Linux 4.2 -

II. Public POCs for CVE-2025-39866

# POC Description Source Link Shenlong Link
1 Proof of concept for CVE-2025-39866 (UAF and race condition) https://github.com/byteReaper77/CVE-2025-39866 POC Details
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III. Intelligence Information for CVE-2025-39866

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39841 9.8 CRITICAL scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39864 8.8 HIGH wifi: cfg80211: fix use-after-free in cmp_bss()
CVE-2025-39839 8.8 HIGH batman-adv: fix OOB read/write in network-coding decode
CVE-2025-39862 8.8 HIGH wifi: mt76: mt7915: fix list corruption after hardware restart
CVE-2025-39848 8.8 HIGH ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39849 8.8 HIGH wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39860 8.0 HIGH Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()
CVE-2025-39837 7.8 HIGH platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39854 7.8 HIGH ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39863 7.8 HIGH wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
CVE-2025-39857 7.5 HIGH net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()
CVE-2025-39851 7.5 HIGH vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39840 7.1 HIGH audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39846 pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()
CVE-2025-39865 tee: fix NULL pointer dereference in tee_shm_put
CVE-2025-39838 cifs: prevent NULL pointer dereference in UTF16 conversion
CVE-2025-39861 Bluetooth: vhci: Prevent use-after-free by removing debugfs files early
CVE-2025-39842 ocfs2: prevent release journal inode after journal shutdown
CVE-2025-39844 mm: move page table sync declarations to linux/pgtable.h
CVE-2025-39843 mm: slub: avoid wake up kswapd in set_track_prepare

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39866

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