KVM: Explicitly verify target vCPU is online in kvm_get_vcpu()
In the Linux kernel, the following vulnerability has been resolved: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() Explicitly verify the target vCPU is fully online _prior_ to clamping the index in kvm_get_vcpu(). If the index is "bad", the nospec clamping will generate '0', i.e. KVM will return vCPU0 instead of NULL. In practice, the bug is unlikely to cause problems, as it will only come into play if userspace or the guest is buggy or misbehaving, e.g. KVM may send interrupts to vCPU0 instead of dropping them on the floor. However, returning vCPU0 when it shouldn't exist per online_vcpus is problematic now that KVM uses an xarray for the vCPUs array, as KVM needs to insert into the xarray before publishing the vCPU to userspace (see commit c5b077549136 ("KVM: Convert the kvm->vcpus array to a xarray")), i.e. before vCPU creation is guaranteed to succeed. As a result, incorrectly providing access to vCPU0 will trigger a use-after-free if vCPU0 is dereferenced and kvm_vm_ioctl_create_vcpu() bails out of vCPU creation due to an error and frees vCPU0. Commit afb2acb2e3a3 ("KVM: Fix vcpu_array[0] races") papered over that issue, but in doing so introduced an unsolvable teardown conundrum. Preventing accesses to vCPU0 before it's fully online will allow reverting commit afb2acb2e3a3, without re-introducing the vcpu_array[0] UAF race.
CVE-2024-58083
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-58083
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "5cce2ed69b00e022b5cdf0c49c82986abd2941a8",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "09d50ccf0b2d739db4a485b08afe7520a4402a63",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "7c4899239d0f70f88ac42665b3da51678d122480",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "d817e510662fd1c9797952408d94806f97a5fffd",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "125da53b3c0c9d7f58353aea0076e9efd6498ba7",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "f2f805ada63b536bc192458a7098388286568ad4",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "ca8da90ed1432ff3d000de4f1e2275d4e7d21b96",
"versionType": "git"
},
{
"status": "affected",
"version": "1d487e9bf8ba66a7174c56a0029c54b1eca8f99c",
"lessThan": "1e7381f3617d14b3c11da80ff5f8a93ab14cfc46",
"versionType": "git"
},
{
"status": "affected",
"version": "559e2696d2f47a3575e9550f101a7e59e30b1b38",
"versionType": "git"
},
{
"status": "affected",
"version": "d39f3cc71382165bb7efb8e06a2bd32f847de4ae",
"versionType": "git"
},
{
"status": "affected",
"version": "7cee966029037a183d98cb88251ceb92a233fe63",
"versionType": "git"
},
{
"status": "affected",
"version": "4.14.120",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.44",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.0.17",
"lessThan": "5.1",
"versionType": "semver"
}
],
"programFiles": [
"include/linux/kvm_host.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.78",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.14",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.3",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/linux/kvm_host.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-58083
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26877 · Revision 1
- Added to Heist Feed
- Publisher date