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CVE-2026-93086— firmware: arm_scmi: Avoid IDR updates while cleaning channels

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： 固件：arm_scmi：在清理通道时避免更新 IDR 函数使用 遍历 TX/RX 通道的 IDR（整数描述符注册表），以释放传输资源并销毁专用传输设备，然后在调用 。 问题在于，销毁回调在遍历过程中从同一个正在被遍历的 IDR 中删除了条目。对于此清理路径而言，这种删除并非必需，而且是不安全的，因为在回调执行期间， 尚未推进其基数树（radix-tree）迭代器。在回调中移除当前条目可能会使迭代器状态失效。此外，无法用 保护该回调，因为 可能会睡眠（即可能阻塞）。 修复方案

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P9

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1< aed24a3c63920539e9de7fbfe7929a2e7c888cd2 affected
05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1< 431c6b872ba7fedcc5a3afb0ec3517db4d95d088 affected
05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1< 54e5a4f7d83db4552d963d0785be32d9df680dcd affected
05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1< bab26acebe55e8ad3ab545abda72faa7ca28c477 affected
05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1< c38b1e19485aaa820e52cfe162525a8af67563da affected
6.3 affected
< 6.3 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-93086

Vulnerability Information
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Vulnerability Title
firmware: arm_scmi: Avoid IDR updates while cleaning channels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.
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 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1 ~ aed24a3c63920539e9de7fbfe7929a2e7c888cd2 -
Linux Linux 6.3 -

II. Public POCs for CVE-2026-93086

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III. Intelligence Information for CVE-2026-93086

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Patches & Fixes for CVE-2026-93086 (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-2026-90173 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-2026-93086

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