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PUBLISHED

CVE-2021-47060

KVM: Stop looking for coalesced MMIO zones if the bus is destroyed

Reserved:2024-02-29
Published:2024-02-29
Updated:2024-04-04

Description

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.

Product status

Default status
unaffected

41b2ea7a6a11 before 7d1bc32d6477
affected

f65886606c2d before 2a20592baff5
affected

f65886606c2d before 168e82f640ed
affected

f65886606c2d before 50cbad42bfea
affected

f65886606c2d before 5d3c4c79384a
affected

Default status
affected

5.9
affected

Any version before 5.9
unaffected

5.4.119
unaffected

5.10.37
unaffected

5.11.21
unaffected

5.12.4
unaffected

5.13
unaffected

References

https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d

https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85

https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c

https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c

https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417

cve.org CVE-2021-47060

nvd.nist.gov CVE-2021-47060

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