Trending
CVE-2025-39866

CVE detail

CVE-2025-39866

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.

CVSS 7.8 · HighBuzz score 38.6

Buzz score

Why this CVE is surfacing

Buzz score total 38.6

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 25.6 · diversity 13.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

25.6

12 evidence mentions in the snapshot

Diversity score

13.0

4 sources across 2 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 1; within the 30d window
Peak daily: 1; highest bucket

Evidence

Source links by recency

Newest mentions first

12 source links · newest first

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFPCISA Alerts
00 CPU 1518(F)-4 PN/DP MFP are affected: SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) vers:intdot/>=3.1.6 (CVE-2021-41617, CVE-2023-28531, CVE-2023-51384, CVE-2023-52927, CVE-2024-26783, CVE-2024-27056, CVE-2024-28956, CVE-2024-36903, CVE-2024-36927, CVE-2024-42079, CVE-2024-46786, CVE-2024-47736, CVE-2024-47809, CVE-2024-49968, CVE-2024-4
governmentwww.cisa.govJul 28, 2026, 12:00 PM
https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comSep 19, 2025, 4:15 PM
https://cert-portal.siemens.com/productcert/html/ssa-032379.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comSep 19, 2025, 4:15 PM
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comSep 19, 2025, 4:15 PM
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmllists.debian.org
No excerpt available.
Vendor Advisorylists.debian.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456git.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3git.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29git.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17agit.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9degit.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406cgit.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM
https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4git.kernel.org
No excerpt available.
Vendor Advisorygit.kernel.orgSep 19, 2025, 4:15 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

Related records

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CVE-2025-39826
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External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2025-39866.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

cpe:2.3:o:debian:debian_linuxSearch this product on Shodan
cpe:2.3:o:linux:linux_kernelSearch this product on Shodan

Exact CVE query

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vuln:CVE-2025-39866Search this CVE on Shodan

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Metadata

Canonical fields

NVD status

Modified

Published

Sep 19, 2025

Modified

Jul 30, 2026

Official record

Authoritative NVD record

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE IDs

Vendor classifications

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): High. There is a total or serious impact to this security property.
Integrity Impact (I): High. There is a total or serious impact to this security property.
Availability Impact (A): High. There is a total or serious impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses