CVE-2026-90188— null_blk: free global tag_set on init error path
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，已修复如下漏洞： null_blk：在初始化错误路径中释放全局 tag_set 当 启用时， 会通过 分配全局 。若设备创建过程后续失败， 路径会销毁默认设备并调用 ，但从未释放全局 。由于模块初始化失败， 永远不会被调用，导致全局 的 tags 和 maps 发生永久性内存泄漏。 修复方式：在 中释放全局 ，与 中的逻辑保持一致，即执行 。
Possible ATT&CK Techniques 1 AI
T1027 · Obfuscated Files or InformationAffected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 82f402fefa50f1675bf918bcd009981bd6b30ac8< 0b2faa330184340d9418ad2c627c2ae881772e33 |
affected |
82f402fefa50f1675bf918bcd009981bd6b30ac8< 665c94554ff0d5d88caae7f40c16c8e0a3369eda |
affected | ||
82f402fefa50f1675bf918bcd009981bd6b30ac8< 2882e1450fa4597811a951196e07553ea134eb31 |
affected | ||
82f402fefa50f1675bf918bcd009981bd6b30ac8< 2b59484ac1e64dd78dbe8c6140891c6308085a75 |
affected | ||
82f402fefa50f1675bf918bcd009981bd6b30ac8< 081cf37e8a0e00cd91d6df53172c9d928790a798 |
affected | ||
82f402fefa50f1675bf918bcd009981bd6b30ac8< 5a1c5ff3a49ba93a1fd0b70537e7a0164071760d |
affected | ||
4.13 |
affected | ||
< 4.13 |
unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2026-90188
Vulnerability Information
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Vulnerability Title
null_blk: free global tag_set on init error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
null_blk: free global tag_set on init error path
If shared_tags is enabled, null_setup_tagset() allocates the global tag_set
via null_init_global_tag_set(). If device creation later fails, err_dev
destroys the default devices and calls unregister_blkdev(), but never frees
the global tag_set. Since module init failed, null_exit() is never invoked,
so the global tag_set's tags and maps are permanently leaked.
Free the global tag_set in err_dev, matching null_exit() which does
if (tag_set.ops) blk_mq_free_tag_set(&tag_set).
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
II. Public POCs for CVE-2026-90188
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-90188 (6)
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 → →
IV. Related Vulnerabilities
Same product: Linux
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CVE-2026-98384
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CVE-2026-98380
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Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-90188
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