KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Acquire SRCU in KVM_GET_MP_STATE to protect guest memory accesses Acquire a lock on kvm->srcu when userspace is getting MP state to handle a rather extreme edge case where "accepting" APIC events, i.e. processing pending INIT or SIPI, can trigger accesses to guest memory. If the vCPU is in L2 with INIT *and* a TRIPLE_FAULT request pending, then getting MP state will trigger a nested VM-Exit by way of ->check_nested_events(), and emuating the nested VM-Exit can access guest memory. The splat was originally hit by syzkaller on a Google-internal kernel, and reproduced on an upstream kernel by hacking the triple_fault_event_test selftest to stuff a pending INIT, store an MSR on VM-Exit (to generate a memory access on VMX), and do vcpu_mp_state_get() to trigger the scenario. ============================= WARNING: suspicious RCU usage 6.14.0-rc3-b112d356288b-vmx/pi_lockdep_false_pos-lock #3 Not tainted ----------------------------- include/linux/kvm_host.h:1058 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by triple_fault_ev/1256: #0: ffff88810df5a330 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x8b/0x9a0 [kvm] stack backtrace: CPU: 11 UID: 1000 PID: 1256 Comm: triple_fault_ev Not tainted 6.14.0-rc3-b112d356288b-vmx #3 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dump_stack_lvl+0x7f/0x90 lockdep_rcu_suspicious+0x144/0x190 kvm_vcpu_gfn_to_memslot+0x156/0x180 [kvm] kvm_vcpu_read_guest+0x3e/0x90 [kvm] read_and_check_msr_entry+0x2e/0x180 [kvm_intel] __nested_vmx_vmexit+0x550/0xde0 [kvm_intel] kvm_check_nested_events+0x1b/0x30 [kvm] kvm_apic_accept_events+0x33/0x100 [kvm] kvm_arch_vcpu_ioctl_get_mpstate+0x30/0x1d0 [kvm] kvm_vcpu_ioctl+0x33e/0x9a0 [kvm] __x64_sys_ioctl+0x8b/0xb0 do_syscall_64+0x6c/0x170 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK>
- Published
- May 1, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.2% · 11th percentile
- CWE
- —
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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 · Linux
- 7.8
- 2.3 point gap
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux11.0
- linux linux kernel6.2 and later · before 6.6.88
- linux linux kernel6.7 and later · before 6.12.24
- linux linux kernelbefore 6.1.135
- linux linux kernel6.14 and later · before 6.14.3
- linux linux kernel6.13 and later · before 6.13.12
- linux linux kernel6.15
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5.11affected
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before 56d997b257075951a46663970cd350cd5e34c041affected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before 0357c8406dfa09430dd9858ebe813feb65524b6eaffected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before 8a3df0aa1087a89f5ce55f4aba816bfcb1ecf1beaffected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before 7bc5c360375d28ba5ef6298b0d53e735c81d66a1affected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before f5cbe725b7477b4cd677be1b86b4e08f90572997affected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before 592e040572f216d916f465047c8ce4a308fcca44affected · git
- 1c96dcceaeb3a99aaf0d548eef2223e0b02a7e40 and later · before ef01cac401f18647d62720cf773d7bb0541827daaffected · git
- before 5.11not affected · semver
- 5.15.209 and later · up to and including 5.15.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.135-1 | 6.1.135-1 |
| Debian:13 | linux | before 6.12.25-1 | 6.12.25-1 |
| openSUSE:Leap 16.0 | dtb-aarch64 | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-64kb | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-default | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-default-base | before 6.12.0-160000.6.1.160000.2.4 | 6.12.0-160000.6.1.160000.2.4 |
| openSUSE:Leap 16.0 | kernel-docs | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-rt | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-source | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-syms | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-docs | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-kvmsmall | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-obs-qa | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-syms | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-zfcpdump | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Micro 6.2 | kernel-64kb | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Micro 6.2 | kernel-default | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Micro 6.2 | kernel-default-base | before 6.12.0-160000.6.1.160000.2.4 | 6.12.0-160000.6.1.160000.2.4 |
| SUSE:Linux Micro 6.2 | kernel-rt | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
| SUSE:Linux Micro 6.2 | kernel-source | before 6.12.0-160000.6.1 | 6.12.0-160000.6.1 |
+1
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- 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 |
|---|---|---|
| Linux Linux | 0357c8406dfa09430dd9858ebe813feb65524b6e | Vendor (CNA) |
| Linux Linux | 56d997b257075951a46663970cd350cd5e34c041 | Vendor (CNA) |
| Linux Linux | 592e040572f216d916f465047c8ce4a308fcca44 | Vendor (CNA) |
| Linux Linux | 7bc5c360375d28ba5ef6298b0d53e735c81d66a1 | Vendor (CNA) |
| Linux Linux | 8a3df0aa1087a89f5ce55f4aba816bfcb1ecf1be | Vendor (CNA) |
| Linux Linux | ef01cac401f18647d62720cf773d7bb0541827da | Vendor (CNA) |
| Linux Linux | f5cbe725b7477b4cd677be1b86b4e08f90572997 | Vendor (CNA) |
| debian:linux | 6.1.135-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.12.0-160000.6.1.160000.2.4 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-docs | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-rt | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-source | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-syms | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-zfcpdump | 6.12.0-160000.6.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.6.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default | 6.12.0-160000.6.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default-base | 6.12.0-160000.6.1.160000.2.4 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-docs | 6.12.0-160000.6.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.12.0-160000.6.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.6.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-obs-qa | 6.12.0-160000.6.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-rt | 6.12.0-160000.6.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-source | 6.12.0-160000.6.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-syms | 6.12.0-160000.6.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
+1
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.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
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)
—
CVSS 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
- git.kernel.org/stable/c/0357c8406dfa09430dd9858ebe813feb65524b6e
- git.kernel.org/stable/c/56d997b257075951a46663970cd350cd5e34c041
- git.kernel.org/stable/c/592e040572f216d916f465047c8ce4a308fcca44
- git.kernel.org/stable/c/7bc5c360375d28ba5ef6298b0d53e735c81d66a1
- git.kernel.org/stable/c/8a3df0aa1087a89f5ce55f4aba816bfcb1ecf1be
- git.kernel.org/stable/c/ef01cac401f18647d62720cf773d7bb0541827da
- git.kernel.org/stable/c/f5cbe725b7477b4cd677be1b86b4e08f90572997
- lists.debian.org/debian-lts-announce/2025/05/msg00045.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.