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CVE-2026-93083— firmware: arm_scmi: Unwind TX receiver mailbox setup 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，已修复以下漏洞： 固件：arm_scmi：在 TX 接收邮箱设置失败时进行回滚处理 函数在成功获取主通道后，可能会额外请求一个单向 TX 接收通道。如果该第二次请求失败，函数会立即返回，导致主通道仍处于已分配状态。 在返回错误前，应先回滚（释放）主邮箱通道，以确保在探测延迟（probe deferral）或其他设置失败的情况下，不会使通道处于忙碌状态，从而影响后续的探测尝试。

AI Predicted 4.4 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1585 · Establish Accounts

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1< babb017cf5e4600c94c23ea87175a0380235a3ee affected
9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1< 717b8e972a667fc1bebe63cbcf0d58e692cbb491 affected
9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1< 9958f55eace8b43713c9fc54dcf90e7cdefee413 affected
9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1< 6f7c06744d53dc8e047725d411d7f915d9ec35ae affected
6.4 affected
< 6.4 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-2026-93083

Vulnerability Information
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Vulnerability Title
firmware: arm_scmi: Unwind TX receiver mailbox setup failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Unwind TX receiver mailbox setup failure mailbox_chan_setup() can request an additional unidirectional TX receiver channel after successfully acquiring the primary channel. If that second request fails, the function returns immediately and leaves the primary channel allocated. Unwind the primary mailbox channel before returning the error so probe deferral or other setup failures do not leave the channel busy for later probe attempts.
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 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1 ~ babb017cf5e4600c94c23ea87175a0380235a3ee -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-93083

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III. Intelligence Information for CVE-2026-93083

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Patches & Fixes for CVE-2026-93083 (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-2026-93083

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