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CVE-2026-93091— firmware: arm_scmi: Quiesce notifications before 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： firmware: arm_scmi: 在拆除（teardown）前静默（quiesce）通知机制 会清除并释放通知实例，但在 TX/RX 通道被释放之前，传输层回调仍可能继续交付传入的通知。在设备移除（remove）过程中，该时间窗口内的 RX 中断可能进入 ，而此时通知状态正在被拆除，从而导致对已释放内存的解引用。在探测（probe）错误路径中，通知初始化之后也存在类似的执行顺序问题。 通知的“延迟初始化”工作项（late-init worker）还存在另一个生命周期问

AI Predicted 4.4 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1626

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 1e7cbfaa66d39e78bd24df0c78b55df68176b59e< 6778bcabd2e0c32f73476f0bc6369013692540be affected
1e7cbfaa66d39e78bd24df0c78b55df68176b59e< 2aac23bc0a79af41104d99823bb250fae92ba144 affected
1e7cbfaa66d39e78bd24df0c78b55df68176b59e< 5e30d3d16d1a9e599be4dcea872874e65e2c277b affected
1e7cbfaa66d39e78bd24df0c78b55df68176b59e< 8e49055d0d495c9c07575ad8e111d9eaf0efb13f affected
5.15 affected
< 5.15 unaffected
6.12.110≤ 6.12.* unaffected
6.18.52≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-93091

Vulnerability Information
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Vulnerability Title
firmware: arm_scmi: Quiesce notifications before teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Quiesce notifications before teardown scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization. The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work. If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance. Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.
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 1e7cbfaa66d39e78bd24df0c78b55df68176b59e ~ 6778bcabd2e0c32f73476f0bc6369013692540be -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-93091

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III. Intelligence Information for CVE-2026-93091

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Patches & Fixes for CVE-2026-93091 (4)

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-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
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-2026-90151 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-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
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

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-2026-93091

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