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CVE-2026-92521— ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root

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，以下漏洞已得到修复： ACPI: PCI: 在所有释放 的路径上清除 问题背景： 函数在调用 和 之前，将新分配的 root 结构体指针赋值给 。然而，在函数末尾的统一错误处理标签（ ）处， 会被 释放。但是，只有经过 失败的路径会在释放前清除 ，而其他失败路径（如 失败）则没有清除，导致 成为悬空指针（dangling pointer）。 具体影响： 1. 当热添加（hot-add）过程中 失败时， 被释放，但 仍指向已释放的内存。由于 ACPI 核心在附着失败时不会自动清除 ，后续调用

AI Predicted 4.4 Difficulty: Hard EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1611 · Escape to Host

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 321bb0eb1486a0d575f02e24e3f4170e408c2f51 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< a285fa3780c768dcc51c76768707d099a2cc611d affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 6aaf6dbf54fdfae096f3f90a79e9614e46579280 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 70cf773cca30a10b4964c24520a71279c974b899 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 3eee4c21931dc048ce63b86809f04e4e6f0dcad5 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217 affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3< 8a742141f7ab84975aa758b775567ef4740ef0cf affected
… +10 more rows
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I. Basic Information for CVE-2026-92521

Vulnerability Information
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Vulnerability Title
ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root acpi_pci_root_add() assigns the freshly allocated root to device->driver_data before dmar_device_add() and pci_acpi_scan_root(). Both failure paths reach the end: label where root is kfree()'d, but only the pci_acpi_scan_root() path clears driver_data first. When dmar_device_add() fails during a hot-add, root is freed while device->driver_data still points at it. The ACPI core does not clear driver_data on attach failure, so a later acpi_pci_find_root() call may dereference this dangling pointer. acpi_pci_root_remove() has the same problem: it frees root without clearing device->driver_data, leaving a dangling pointer behind after the root bridge is removed. Move the NULL assignment to the shared end: label so every error path in acpi_pci_root_add() clears driver_data before freeing root, and clear it in acpi_pci_root_remove() as well, so the object is never left reachable through driver_data after being freed.
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 db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 ~ 321bb0eb1486a0d575f02e24e3f4170e408c2f51 -
Linux Linux 2.6.28 -

II. Public POCs for CVE-2026-92521

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III. Intelligence Information for CVE-2026-92521

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Patches & Fixes for CVE-2026-92521 (8)

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-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
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-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
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-2026-92521

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