Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ecb739cf15a9bae040ce6b60209b78b92512d120 before c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before 93a2385730540105df8524447dcc11309ad280f9; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before ea33fac0df7fe7b49a4b27acb83e227b82317d1d; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before 5a250bff75a446374c05622973b18b4ab662b504; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before 85aeb8fc61839098ae0942ccba86e669c08e75d4; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before 6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before fb4824880b0dba0e7b3a497c46c642f979630392; affected 75d95e2e39b27f733f21e6668af1c9893a97de5e before b48373c901951fad1a26bd7c33ad91172b3945b5; affected 67cf0fbcac0d42d4d4686cddc1e39f465bbfec37; affected d09639528b66b5c7c20dc8f7fb8928aacabd40bb; affected c14a54675db7131791402fa22fb0fa6da1f5fb66; affected 5.10.58 before 5.10.270; affected 4.19.203 before 4.20; affected 5.4.140 before 5.5; affected 5.13.10 before 5.14 |
| Linux / Linux | affected 5.14; unaffected 0 before 5.14; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7
- https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9
- https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d
- https://git.kernel.org/stable/c/5a250bff75a446374c05622973b18b4ab662b504
- https://git.kernel.org/stable/c/85aeb8fc61839098ae0942ccba86e669c08e75d4
- https://git.kernel.org/stable/c/6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b
- https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392
- https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5