Kernel: kvm: svm: improper check in svm_set_x2apic_msr_interception allows direct access to host x2apic msrs
A flaw was found in KVM. An improper check in svm_set_x2apic_msr_interception() may allow direct access to host x2apic msrs when the guest resets its apic, potentially leading to a denial of service condition.
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for help- Published
- Nov 6, 2023
- Updated
- Aug 6, 2026
- EPSS
- 0.2% · 14th percentile
- CWE
- CWE-755
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- 5.5
- CNA · redhat
- 6.0
- 0.5 point gap
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernelup to 6.5 inclusive
- linux linux kernel6.6
- redhat enterprise linux8.0
- redhat enterprise linux9.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
Red Hat Red Hat Enterprise Linux 6
- all versionsunknown
Red Hat Red Hat Enterprise Linux 7
- all versionsunknown
- all versionsunknown
Red Hat Red Hat Enterprise Linux 8
- 0:4.18.0-553.8.1.rt7.349.el8_10 and laternot affected · rpm
- 0:4.18.0-553.8.1.el8_10 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9
- 0:5.14.0-427.16.1.el9_4 and laternot affected · rpm
- 0:5.14.0-427.16.1.el9_4 and laternot affected · rpm
- all versionsaffected
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
- 0:5.14.0-284.69.1.el9_2 and laternot affected · rpm
- 0:5.14.0-284.69.1.rt14.354.el9_2 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | bpftool | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.8.1.el8_10 | 4.18.0-553.8.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-kvm | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
| AlmaLinux:8 | kernel-rt-devel | before 4.18.0-553.8.1.rt7.349.el8_10 | 4.18.0-553.8.1.rt7.349.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:bpftool | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-abi-stablelists | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-core | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-cross-headers | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-core | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-devel | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules-extra | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-devel | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-doc | 4.18.0-553.8.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.64-1 · Debian:12 | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:7.3.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel-matched | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debuginfo-common-aarch64 | 0:5.14.0-427.16.1.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| rocky linux:kernel | 0:4.18.0-553.8.1.el8_10 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:kernel-rt | 0:4.18.0-553.8.1.rt7.349.el8_10 · Rocky Linux:8 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2022-4861966 days apartAn issue was discovered in drivers/input/input.c in the Linux kernel before 5.17.10.22Monitor
- CVE-2024-26584107 days apartnet: tls: handle backlogging of crypto requests22Monitor
- CVE-2021-46928113 days apartparisc: Clear stale IIR value on instruction access rights trap22Monitor
- CVE-2022-48673179 days apartnet/smc: Fix possible access to freed memory in link clear22Monitor
- CVE-2024-50001350 days apartnet/mlx5: Fix error path in multi-packet WQE transmit22Monitor
- CVE-2024-50002350 days apartstatic_call: Handle module init failure correctly in static_call_del_module()22Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-755 · Improper Handling of Exceptional ConditionsCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2024:2758
- access.redhat.com/errata/RHSA-2024:3854
- access.redhat.com/errata/RHSA-2024:3855
- access.redhat.com/errata/RHSA-2024:4211
- access.redhat.com/errata/RHSA-2024:4352
- access.redhat.com/security/cve/CVE-2023-5090
- bugzilla.redhat.com/show_bug.cgi?id=2248122
Vendor advisories and official records. Exploit/PoC links are deliberately left out.