Vulnerability Details : 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.
Products affected by CVE-2021-47060
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Exploit prediction scoring system (EPSS) score for CVE-2021-47060
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 15 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-47060
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.0
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H |
0.8
|
5.2
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2024-11-07 |
References for CVE-2021-47060
-
https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed - kernel/git/stable/linux.git - Linux kernel stable tree
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