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CVE-2026-90219— RDMA/cxgb4: Free debugfs on registration failure

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，以下漏洞已得到修复： RDMA/cxgb4：在注册失败时释放 debugfs c4iw_alloc() 会为每个设备创建 debugfs 目录树（通过 setup_debugfs() 将根目录存储在 dev->debugfs_root 中），但该目录树仅在 c4iw_remove() 中被移除，而未在 c4iw_dealloc() 中处理。当 RDMA 设备注册失败时，注册工作线程的错误处理路径 err_dealloc_ctx 会直接调用 c4iw_dealloc()，从而绕过 c4iw_r

AI Predicted 3.4 Difficulty: Theoretical EPSS 0.23% · P13

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 49ea0c036ede81f126f1a9389d377999fdf5c5a1< 459b59f7ed56511d6529311cb4e5e482ebfcfb8e affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< cd60992f09b7e83bfd3c76e3bb06b29f3e2fa0a8 affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< c332d9e7dce234d8bef78271d003a68ee943b61b affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< f98e894ec029a752cf9c7f7834741bead0fb463d affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< 479a7f90060e62bdd9bb4036ec0a70bf460f6d23 affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< 046425412529dbfca1433c8bef5641b271b4ab2a affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< ea41b5630fa3d9877ce9ed8832cf5575f742bfbb affected
49ea0c036ede81f126f1a9389d377999fdf5c5a1< fe5c16bb6252dea6025b748257ddc3b2665495b0 affected
… +16 more rows
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I. Basic Information for CVE-2026-90219

Vulnerability Information
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Vulnerability Title
RDMA/cxgb4: Free debugfs on registration failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Free debugfs on registration failure c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via setup_debugfs()), but it is removed only in c4iw_remove(), not in c4iw_dealloc(). When RDMA device registration fails, the registration worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing c4iw_remove(), so the debugfs dentries leak and outlive the freed c4iw_dev. Move debugfs_remove_recursive() into c4iw_dealloc() so every path that frees ctx->dev also removes its debugfs tree.
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 49ea0c036ede81f126f1a9389d377999fdf5c5a1 ~ 459b59f7ed56511d6529311cb4e5e482ebfcfb8e -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-90219

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III. Intelligence Information for CVE-2026-90219

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Patches & Fixes for CVE-2026-90219 (5)

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

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
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-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

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-2026-90219

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