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Bluetooth: fix UAF in bt_accept_dequeue()

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

Affected products

Linux
  • <5.10.261
  • <96ad400d5132eb333f28f6f1e2d58f0728ca9547
  • <50c662bdcd51b03033a0abed6716bfd377ba1049
  • =<7.1.*
  • =<6.1.*
  • <4bd0b274054f2679f28b70222b607bb0afc3ab9a
  • <0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0
  • =<5.15.*
  • =<5.10.*
  • ==a5ca86a6097a8b030ca3226cd300b17ed330f966
  • <5.15.212
  • <6.12.96
  • <7.1
  • <c0577c55219be42b6ea2ea8db11e85bfab6f4e8d
  • <7.1
  • <6.6.145
  • <c66a95e60b65d876a927123b0ed36bd6177d9ca6
  • =<6.6.*
  • <6.1.178
  • =<6.18.*
  • <26168db1ce5a9766cde021b18e590a101c056614
  • ==7.1
  • =<6.12.*
  • =<*
  • <6303ed4bbe0095f4cc195225479bf506e010d1db
  • <6.18.39