CVE-2022-48793
KVM: x86: nSVM: fix potential NULL derefernce on nested migration
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: nSVM: fix potential NULL derefernce on nested migration
Turns out that due to review feedback and/or rebases
I accidentally moved the call to nested_svm_load_cr3 to be too early,
before the NPT is enabled, which is very wrong to do.
KVM can't even access guest memory at that point as nested NPT
is needed for that, and of course it won't initialize the walk_mmu,
which is main issue the patch was addressing.
Fix this for real.
A vulnerability was found in the nested.c file in the Linux kernel's KVM driver, where a potential NULL dereference can occur. This happens when the call to load the nested state is executed before Nested Page Tables (NPT) are enabled, preventing access to guest memory, lead to system instability and a denial of service during nested migration processes.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-07-16 CVE Reserved
- 2024-07-16 CVE Published
- 2024-08-08 EPSS Updated
- 2024-09-11 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-476: NULL Pointer Dereference
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/232f75d3b4b5456de6f0b671aa86345d62de1473 | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2022-48793 | 2024-08-21 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2298129 | 2024-08-21 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.13 < 5.15.25 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.15.25" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.13 < 5.16.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.16.11" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.13 < 5.17 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.13 < 5.17" | en |
Affected
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