CVE-2026-90284

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/5a250bff75a446374c05622973b18b4ab662b504
https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b
https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4
https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9
https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5
https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7
https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d
https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392

Configurations

No configuration.

History

17 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:17

Updated : 2026-09-17 17:17

NVD link : CVE-2026-90284

Mitre link : CVE-2026-90284

CVE.ORG link : CVE-2026-90284

JSON object : View

Products Affected

No product.

CWE

No CWE.

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"4.20", "versionType": "semver"}, {"status": "affected", "version": "5.4.140", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.13.10", "lessThan": "5.14", "versionType": "semver"}], "programFiles": ["drivers/base/firmware_loader/fallback.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"status": "unaffected", "version": "0", "lessThan": "5.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.110", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.52", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.6", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/base/firmware_loader/fallback.c"], "defaultStatus": "affected"}]}], "published": "2026-09-17T17:17:25.203", "references": [{"url": "https://git.kernel.org/stable/c/5a250bff75a446374c05622973b18b4ab662b504", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: do not queue completed sysfs fallback requests\n\nfw_load_sysfs_fallback() calls device_add() before adding the fw_priv to\npending_fw_head. device_add() publishes the fallback loading interface, so\na userspace helper which discovers the device by scanning sysfs can write 0\nto the loading attribute and complete the request before it is queued as\npending.\n\nIn that interleaving firmware_loading_store() calls fw_state_done() while\npending_list still points to itself, so it cannot remove an entry from\npending_fw_head. The subsequent unconditional list_add() then queues an\nalready-completed fw_priv. Once the request is released, pending_fw_head\ncan retain a pointer to freed memory and the next fallback request can\nfault while validating the list.\n\nOnly in-flight fallback requests need suspend or reboot abort handling. If\nthe request is already DONE after device_add(), return success from the\nfallback path without sending another uevent, waiting again, or queueing it\nas pending. This preserves the invariant that pending_fw_head contains only\nactive fallback requests."}], "lastModified": "2026-09-17T17:17:25.203", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}