CVE-2025-39866— fs: writeback: fix use-after-free in __mark_inode_dirty()
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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
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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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total
| CVE-2025-39852 | net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6 | |
| CVE-2025-39837 | platform/x86: asus-wmi: Fix racy registrations | |
| CVE-2025-39838 | cifs: prevent NULL pointer dereference in UTF16 conversion | |
| CVE-2025-39839 | batman-adv: fix OOB read/write in network-coding decode | |
| CVE-2025-39840 | audit: fix out-of-bounds read in audit_compare_dname_path() | |
| CVE-2025-39841 | scsi: lpfc: Fix buffer free/clear order in deferred receive path | |
| 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 | |
| CVE-2025-39845 | x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() | |
| CVE-2025-39846 | pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region() | |
| CVE-2025-39847 | ppp: fix memory leak in pad_compress_skb | |
| CVE-2025-39848 | ax25: properly unshare skbs in ax25_kiss_rcv() | |
| CVE-2025-39849 | wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result() | |
| CVE-2025-39850 | vxlan: Fix NPD in {arp,neigh}_reduce() when using nexthop objects | |
| CVE-2025-39865 | tee: fix NULL pointer dereference in tee_shm_put | |
| CVE-2025-39851 | vxlan: Fix NPD when refreshing an FDB entry with a nexthop object | |
| CVE-2025-39853 | i40e: Fix potential invalid access when MAC list is empty | |
| CVE-2025-39854 | ice: fix NULL access of tx->in_use in ice_ll_ts_intr | |
| CVE-2025-39856 | net: ethernet: ti: am65-cpsw-nuss: Fix null pointer dereference for ndev |
Showing top 20 of 30 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-39866
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