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CVE-2026-90284— firmware_loader: do not queue completed sysfs fallback requests

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： firmware_loader：不要将已完成的 sysfs 回退请求加入队列 在将 添加到 之前调用了 。由于 会发布回退加载接口，因此，通过扫描 sysfs 发现设备的用户空间辅助程序可以在该请求被标记为 pending 之前，向 属性写入 0 从而提前完成该请求。 在这种交错情况下，当 仍指向自身时， 会调用 ，因此无法从 中移除条目。随后，无条件的 会将一个已经完成的 加入队列。一旦该请求被释放， 可能会保留指向已释放内存的指针，下一个回退请求在验证列表时可能会因

AI Predicted 7.8 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 25

VendorProduct Version RangeStatus
Linux Linux ecb739cf15a9bae040ce6b60209b78b92512d120< c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7 affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< 93a2385730540105df8524447dcc11309ad280f9 affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< ea33fac0df7fe7b49a4b27acb83e227b82317d1d affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< 5a250bff75a446374c05622973b18b4ab662b504 affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< 85aeb8fc61839098ae0942ccba86e669c08e75d4 affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< 6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< fb4824880b0dba0e7b3a497c46c642f979630392 affected
75d95e2e39b27f733f21e6668af1c9893a97de5e< b48373c901951fad1a26bd7c33ad91172b3945b5 affected
… +17 more rows
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I. Basic Information for CVE-2026-90284

Vulnerability Information
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Vulnerability Title
firmware_loader: do not queue completed sysfs fallback requests
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: firmware_loader: do not queue completed sysfs fallback requests fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to pending_fw_head. device_add() publishes the fallback loading interface, so a userspace helper which discovers the device by scanning sysfs can write 0 to the loading attribute and complete the request before it is queued as pending. In that interleaving firmware_loading_store() calls fw_state_done() while pending_list still points to itself, so it cannot remove an entry from pending_fw_head. The subsequent unconditional list_add() then queues an already-completed fw_priv. Once the request is released, pending_fw_head can retain a pointer to freed memory and the next fallback request can fault while validating the list. Only in-flight fallback requests need suspend or reboot abort handling. If the request is already DONE after device_add(), return success from the fallback path without sending another uevent, waiting again, or queueing it as pending. This preserves the invariant that pending_fw_head contains only active fallback requests.
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 ecb739cf15a9bae040ce6b60209b78b92512d120 ~ c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7 -
Linux Linux 5.14 -

II. Public POCs for CVE-2026-90284

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III. Intelligence Information for CVE-2026-90284

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Patches & Fixes for CVE-2026-90284 (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-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
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-2026-90151 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-2026-90413 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-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
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-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

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-2026-90284

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