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CVE-2026-93109— RDMA/mlx5: Drain RCU callbacks during module teardown

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，已修复以下漏洞： RDMA/mlx5：在模块卸载期间排空 RCU 回调 可能在最后一个 DevX 事件文件释放其模块引用，或者辅助驱动程序分离其设备后，仍处于排队状态。这会导致 在回调执行之前就被卸载。 注册错误回退（unwind）也存在相同风险，因为驱动程序注册过程可能在失败前已附着现有设备。因此，需要在所有驱动程序停止之后再等待。

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P10

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 6898d1c661d79f4707d8ba82991b2195822780ca< ca428e597f12b278bf158356e34641e6386cfa82 affected
6898d1c661d79f4707d8ba82991b2195822780ca< 59d60e04afd012f07e996d2e34cb90a4ec6f5cff affected
6898d1c661d79f4707d8ba82991b2195822780ca< 2f946e7839f677fa14574b6babad14b37ae0bbbe affected
6898d1c661d79f4707d8ba82991b2195822780ca< 4be7810ba70291abb2f68cc6db0ae1b93ee9c76a affected
6898d1c661d79f4707d8ba82991b2195822780ca< 7babc25d8dd5b7642920fbc0737cfd1469e7025b affected
6898d1c661d79f4707d8ba82991b2195822780ca< 4664368b9bd9d5d79ebad24056b98c34b9fed20f affected
6898d1c661d79f4707d8ba82991b2195822780ca< e37cdd75f8d61c1123d324ae5667ac3da562290e affected
5.6 affected
… +8 more rows
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I. Basic Information for CVE-2026-93109

Vulnerability Information
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Vulnerability Title
RDMA/mlx5: Drain RCU callbacks during module teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Drain RCU callbacks during module teardown devx_free_subscription() can remain queued after the last DevX event file drops its module reference or an auxiliary driver detaches its devices. mlx5_ib can then unload before the callback runs. Registration error unwind has the same risk because driver registration can attach existing devices before failing. Wait after all drivers have stopped.
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 6898d1c661d79f4707d8ba82991b2195822780ca ~ ca428e597f12b278bf158356e34641e6386cfa82 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-93109

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III. Intelligence Information for CVE-2026-93109

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Patches & Fixes for CVE-2026-93109 (7)

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-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
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-2026-90110 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-2026-90413 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-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
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-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
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-2026-93109

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