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CVE-2026-90209— s390/debug: Fix deadlock during unregister

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.

在 Linux 内核中，以下漏洞已修复： s390/debug：修复注销过程中的死锁问题 当关联的 debugfs 文件正在被写入时，注销 s390dbf 调试区域可能会导致死锁： 调用链如下： 修复方法：将 拆分为 s390dbf 部分和 debugfs 部分，并在持有 锁时仅执行 s390dbf 部分。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 9372a82892c2caa6bccab9a4081166fa769699f8< a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed affected
9372a82892c2caa6bccab9a4081166fa769699f8< 183f8f6d64bb0510070c856b9927618c53014a7b affected
9372a82892c2caa6bccab9a4081166fa769699f8< a08b70ed2d1ec907353a72f15163b8e34ff4b2f8 affected
9372a82892c2caa6bccab9a4081166fa769699f8< 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba affected
9372a82892c2caa6bccab9a4081166fa769699f8< 5d83f3faa3fb7f23f298cfd40382611999de5d1d affected
9372a82892c2caa6bccab9a4081166fa769699f8< 54e1259b75d6402a1d0cfb822b9bb2c507e53dab affected
9372a82892c2caa6bccab9a4081166fa769699f8< 445c31ac638fd1af203d79bdf25fc0cb3149fbbc affected
c68ba4a708fbd0efdc384cd29250bb292a45e559 affected
… +16 more rows
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I. Basic Information for CVE-2026-90209

Vulnerability Information
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Vulnerability Title
s390/debug: Fix deadlock during unregister
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix deadlock during unregister Unregistering an s390dbf debug area while one of the associated debugfs files is being written to can cause a deadlock: $ echo >.../vmur/level $ rmmod vmur =================================================== debugfs write debugfs_file_get() debug_unregister() mutex_lock(debug_mutex) debugfs_remove() wait for debugfs_file_put() debug_file_ops.write() debug_input() mutex_lock(debug_mutex) ==> DEADLOCK Fix this by splitting debug_unregister() into an s390dbf and debugfs part, and running only the s390dbf part with debug_mutex locked.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9372a82892c2caa6bccab9a4081166fa769699f8 ~ a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-90209

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III. Intelligence Information for CVE-2026-90209

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Patches & Fixes for CVE-2026-90209 (7)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90209

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