CVE-2021-47060

In the Linux kernel, the following vulnerability has been resolved: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.

• https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63cPatch
• https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85Patch
• https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713cPatch
• https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417Patch
• https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2dPatch
• https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63cPatch
• https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85Patch
• https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713cPatch
• https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417Patch
• https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2dPatch

Published

Feb 29, 2024

Last Modified

Aug 4, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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