CVE-2026-89928 KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Consume the locked rmap value in the lockless rmap walk kvmrmaplock deliberately elides the rmap lock when it observes an empty rmap. In that case kvmrmaplockreadonly also re-enables preemption and returns zero, so...

CVE-2026-89929

CVE-2026-89929 affects the Linux kernel KVM subsystem, specifically the nested virtualization (nVM ) code path that emulates the INVVPID instruction. When a guest L1 vCPU migrates between physical CPUs and issues INVVPID, KVM executes the instruction on the current physical CPU rather than the on...

CVE-2026-89928

CVE-2026-89928 is a slab use-after-free in the Linux kernel's KVM x86/mmu subsystem. The root cause is a race condition in the lockless reverse-mapping (rmap) walk: kvm_rmap_age_gfn_range() ignores the value returned by kvm_rmap_lock_readonly() and instead re-reads the rmap head via rmap_get_firs...

CVE-2026-89927 KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: hyper-v: Clamp stimer deadline to avoid livelock Fix an issue where userspace or the guest can program an Hyper-V synthetic timer to have a deadline in the past via integer overflow, preventing the CPU from making...

CVE-2026-89926 KVM: s390: Fix length check __import_wp_info()

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix length check importwpinfo struct kvmhwbreakpoint::len is a u64 that is fully controlled by user space. This is then assigned to wpinfo-len, which is an int. The bounds check is done on the truncated value while the...

EUVD-2026-80526

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix length check importwpinfo struct kvmhwbreakpoint::len is a u64 that is fully controlled by user space. This is then assigned to wpinfo-len, which is an int. The bounds check is done on the truncated value while the...

EUVD-2026-80525

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory leak in guest debug handling bpdata is freed only for the error case by kfreebpdata. Every successful KVMSETGUESTDEBUG will leak bpdata...

CVE-2026-89925 KVM: s390: Fix memory leak in guest debug handling

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory leak in guest debug handling bpdata is freed only for the error case by kfreebpdata. Every successful KVMSETGUESTDEBUG will leak bpdata...

CVE-2026-89925 KVM: s390: Fix memory leak in guest debug handling

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix memory leak in guest debug handling bpdata is freed only for the error case by kfreebpdata. Every successful KVMSETGUESTDEBUG will leak bpdata...

CVE-2026-89926

CVE-2026-89926 affects the Linux kernel KVM s390 subsystem in the __import_wp_info() function. The root cause is a type truncation : the user-space-controlled kvm_hw_breakpoint::len (a __u64) is assigned to wp_info->len (an int). The bounds check evaluates the truncated value, but the subseque...

CVE-2026-89925

CVE-2026-89925 affects the Linux kernel KVM s390 module. The root cause is a memory leak in the guest debug handling path: bp_data is freed via kfree() only in the error case of KVM_SET_GUEST_DEBUG, so every successful KVM_SET_GUEST_DEBUG call leaks the allocation. The practical impact is a per-c...

CVE-2026-89924 KVM: s390: Fix old_data leak in guest debug error path

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix olddata leak in guest debug error path importwpinfo allocates a per-watchpoint olddata buffer to back up the original guest memory contents. If a later watchpoint of the same KVMSETGUESTDEBUG request fails to impor...

CVE-2026-89924 KVM: s390: Fix old_data leak in guest debug error path

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix olddata leak in guest debug error path importwpinfo allocates a per-watchpoint olddata buffer to back up the original guest memory contents. If a later watchpoint of the same KVMSETGUESTDEBUG request fails to impor...

CVE-2026-89924

This Linux kernel vulnerability affects the KVM s390 subsystem's guest debug interface. In __import_wp_info(), per-watchpoint old_data buffers are allocated to back up original guest memory contents. When a later watchpoint in the same KVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_...

EUVD-2026-80524

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix olddata leak in guest debug error path importwpinfo allocates a per-watchpoint olddata buffer to back up the original guest memory contents. If a later watchpoint of the same KVMSETGUESTDEBUG request fails to impor...

CVE-2026-89923 KVM: s390: Free guest debug data on vcpu destroy

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Free guest debug data on vcpu destroy kvms390clearbpdata is only called from kvmarchvcpuioctlsetguestdebug, i.e. when user space changes or disables debugging. A vCPU that is destroyed while hardware breakpoints are...

CVE-2026-89923 KVM: s390: Free guest debug data on vcpu destroy

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Free guest debug data on vcpu destroy kvms390clearbpdata is only called from kvmarchvcpuioctlsetguestdebug, i.e. when user space changes or disables debugging. A vCPU that is destroyed while hardware breakpoints are...

EUVD-2026-80522

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data importwpinfo backs up the original guest memory contents of a watchpoint with readguestabs, which is kvmreadguest and therefore resolves the memslot via kvmmemslots. That requir...

CVE-2026-89922 KVM: s390: Take srcu when importing watchpoint data

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data importwpinfo backs up the original guest memory contents of a watchpoint with readguestabs, which is kvmreadguest and therefore resolves the memslot via kvmmemslots. That requir...

CVE-2026-89922

CVE-2026-89922 is a race condition in the Linux kernel's KVM s390 subsystem. The function __import_wp_info() uses kvm_read_guest() to back up guest memory contents of a watchpoint, which resolves memslots via __kvm_memslots(). This call requires holding kvm->srcu (or kvm->slots_lock), but t...