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CVE-2026-90386— i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices

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.

以下是该 Linux 内核漏洞描述的中文翻译： 在 Linux 内核中，以下漏洞已修复： i3c: dw: 避免 DAA 未分配任何设备时发生移位越界 在空总线上，ENTDAA 不会分配任何地址，因此 （未被分配的地址数量）等于 。 此时， 的索引 将变为 -1，从而触发 UBSAN（未定义行为静态分析工具）报错。该问题在 Gigabyte/AMD 服务器上每次启动时都会触发： 修复方式： 当没有新设备被分配时，跳过生成掩码（mask）的操作。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.22% · P11

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 5650b013e6bfc14c8b30be727f4a715b01860a08 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 63110ccc434e10d9e9d2c7d82ebfa8a6f9cedd94 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 3a1c35739efb69e8ec2a868113a0471a01bb8f29 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 111f559e5b6461f5f6977275716e6c5d1eb7ea27 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 754533e6169d1f10bdef7a6ba9bd7740b524e1d4 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 9eaac0cb4ca94e2e32c53c156ae5b813ba7ef90c affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 618dd640ded6b94bbdb79c798a901ec564797033 affected
1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef< 038cf48b3170af26a70bf2dee4f8c3ac910f5176 affected
… +10 more rows
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I. Basic Information for CVE-2026-90386

Vulnerability Information
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Vulnerability Title
i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: i3c: dw: avoid shift-out-of-bounds when DAA assigns no devices On an empty bus ENTDAA assigns nothing, so cmd->rx_len (the count of addresses left unassigned) equals master->maxdevs. The GENMASK() index master->maxdevs - cmd->rx_len - 1 then becomes -1, which trips up UBSAN. This happens every time on boot on a Gigabyte/AMD server: UBSAN: shift-out-of-bounds in drivers/i3c/master/dw-i3c-master.c:905:12 shift exponent 64 is too large for 64-bit type 'long unsigned int' CPU: 7 UID: 0 PID: 963 Comm: (udev-worker) Not tainted 7.0.11-200.fc44.x86_64 #1 PREEMPT(lazy) Hardware name: Giga Computing E163-Z34-AAH1-000/MZ33-DC1-000, BIOS R32_F45 04/01/2026 Call Trace: <TASK> dump_stack_lvl+0x5d/0x80 ubsan_epilogue+0x5/0x2b __ubsan_handle_shift_out_of_bounds.cold+0xd7/0x1ab dw_i3c_master_daa.cold+0x1b/0x96 [dw_i3c_master] i3c_master_do_daa_ext.part.0+0x3e/0xf0 [i3c] Skip the mask when no new device was assigned.
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 1dd728f5d4d4b8b53196c1e0fcf86bbaaee39cef ~ 5650b013e6bfc14c8b30be727f4a715b01860a08 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-90386

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III. Intelligence Information for CVE-2026-90386

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Patches & Fixes for CVE-2026-90386 (8)

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

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-2026-90151 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-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
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-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
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-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
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-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too

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-2026-90386

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