CVE-2021-47390

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47390
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47390.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47390
Related
Published
2024-05-21T15:15:24Z
Modified
2024-09-18T03:17:26.847264Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Fix stack-out-of-bounds memory access from ioapicwriteindirect()

KASAN reports the following issue:

BUG: KASAN: stack-out-of-bounds in kvmmakevcpusrequestmask+0x174/0x440 [kvm] Read of size 8 at addr ffffc9001364f638 by task qemu-kvm/4798

CPU: 0 PID: 4798 Comm: qemu-kvm Tainted: G X --------- --- Hardware name: AMD Corporation DAYTONAX/DAYTONAX, BIOS RYM0081C 07/13/2020 Call Trace: dumpstack+0xa5/0xe6 printaddressdescription.constprop.0+0x18/0x130 ? kvmmakevcpusrequestmask+0x174/0x440 [kvm] _kasanreport.cold+0x7f/0x114 ? kvmmakevcpusrequestmask+0x174/0x440 [kvm] kasanreport+0x38/0x50 kasancheckrange+0xf5/0x1d0 kvmmakevcpusrequestmask+0x174/0x440 [kvm] kvmmakescanioapicrequestmask+0x84/0xc0 [kvm] ? kvmarchexit+0x110/0x110 [kvm] ? schedclock+0x5/0x10 ioapicwriteindirect+0x59f/0x9e0 [kvm] ? staticobj+0xc0/0xc0 ? _lockacquired+0x1d2/0x8c0 ? kvmioapiceoiinject_work+0x120/0x120 [kvm]

The problem appears to be that 'vcpubitmap' is allocated as a single long on stack and it should really be KVMMAXVCPUS long. We also seem to clear the lower 16 bits of it with bitmapzero() for no particular reason (my guess would be that 'bitmap' and 'vcpubitmap' variables in kvmbitmapordest_vcpus() caused the confusion: while the later is indeed 16-bit long, the later should accommodate all possible vCPUs).

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.84-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.12-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.12-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}