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CVE-2026-90309— RDMA/erdma: Hold CQ references when processing EQ events

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，已解决以下漏洞： RDMA/erdma：在处理 EQ 事件时持有 CQ 引用 EQ（事件队列）处理程序会从 中查找 CQ（完成队列），并在 xarray 锁之外调用 CQ 的完成或错误回调。然而， 可能在先前已调度的 EQ 处理程序仍在使用该 CQ 时，将其从 xarray 中移除，并释放其队列缓冲区和门铃记录。 修复方法：为 CQ 添加引用计数（refcount），并在 xarray 锁保护下使用 增加引用计数。在释放 CQ 资源之前，先移除销毁路径中的引用，并等待所有正在处理中的 EQ

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 155055771704f8cbb5c176a4309b7dc30a50450c< 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8 affected
155055771704f8cbb5c176a4309b7dc30a50450c< c0a83f29a24c7e7f8516630848ef6db4c174deed affected
155055771704f8cbb5c176a4309b7dc30a50450c< 05b8ca493dd02319bca93c640b259c2ba51ef321 affected
155055771704f8cbb5c176a4309b7dc30a50450c< 1fc9c1933959d2776a1ce7bf424251b8b5b586cd affected
155055771704f8cbb5c176a4309b7dc30a50450c< 4545f355654d044d35a31cd01cc46f491a8a7c36 affected
155055771704f8cbb5c176a4309b7dc30a50450c< 98df2aee1459ee1c62c70cbe9b370d2a532aea36 affected
6.0 affected
< 6.0 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-90309

Vulnerability Information
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Vulnerability Title
RDMA/erdma: Hold CQ references when processing EQ events
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or error callbacks outside the xarray lock. erdma_destroy_cq() can erase the CQ from the xarray and free its queue buffer and doorbell record while a previously scheduled EQ handler is still using the CQ. Add a CQ refcount and take a reference under the xarray lock with refcount_inc_not_zero(). Remove the CQ from the xarray before dropping the destroy-path reference, then wait for in-flight EQ users before releasing CQ resources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 155055771704f8cbb5c176a4309b7dc30a50450c ~ 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-90309

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III. Intelligence Information for CVE-2026-90309

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Patches & Fixes for CVE-2026-90309 (6)

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

CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
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-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
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-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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