Описание
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
walk_s1() and kvm_walk_nested_s2() expect to be called while holding
kvm->srcu to guard against memslot changes. While this is generally
the case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the
respective walkers without taking kvm->srcu.
Fix by acquiring kvm->srcu prior to the table walk in both instances.
A flaw was found in the Kernel-based Virtual Machine (KVM) component of the Linux kernel on arm64 architectures. This vulnerability occurs because certain page table walk operations, used in fault injection and Address Translation (AT) emulation, do not properly acquire a Sleepable Read-Copy Update (SRCU) lock. This omission could lead to inconsistencies in memory slot management, potentially causing system instability or unexpected behavior within the virtualized environment.
Отчет
A flaw of important severity was found in the Kernel-based Virtual Machine (KVM) arm64 support of the Linux kernel. The page table walk helpers walk_s1() and kvm_walk_nested_s2(), which are used during fault injection and Address Translation (AT) emulation, expect to be called while holding the kvm->srcu lock that guards against memory slot (memslot) changes. However, __kvm_at_s12() and __kvm_find_s1_desc_level() call into these walkers without taking kvm->srcu, so those operations can race with memslot changes and lead to inconsistencies in memory slot management, potentially causing system instability or unexpected behavior within the virtualized environment. Exploitation requires local access with low privileges and successfully winning a race condition, as reflected in the Red Hat CVSS:3.1 score of 7.0 IMPORTANT (AV:L/AC:H/PR:L/UI:N/S:U), which matches the upstream CVEORG severity. This flaw affects the kernel and kpatch components in Red Hat Enterprise Linux 10 and the kernel components in Red Hat In-Vehicle OS 2, where a fix is being pursued through the delegated maintenance streams. The kernel, kernel-rt, and kpatch components in Red Hat Enterprise Linux 6, 7, 8, and 9 are not affected because the vulnerable code is not present in those releases.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 10 | kernel | Fixed | RHSA-2026:64775 | 08.09.2026 |
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Дополнительная информация
Статус:
EPSS
7 High
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation walk_s1() and kvm_walk_nested_s2() expect to be called while holding kvm->srcu to guard against memslot changes. While this is generally the case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the respective walkers without taking kvm->srcu. Fix by acquiring kvm->srcu prior to the table walk in both instances.
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation walk_s1() and kvm_walk_nested_s2() expect to be called while holding kvm->srcu to guard against memslot changes. While this is generally the case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the respective walkers without taking kvm->srcu. Fix by acquiring kvm->srcu prior to the table walk in both instances.
In the Linux kernel, the following vulnerability has been resolved: K ...
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation walk_s1() and kvm_walk_nested_s2() expect to be called while holding kvm->srcu to guard against memslot changes. While this is generally the case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the respective walkers without taking kvm->srcu. Fix by acquiring kvm->srcu prior to the table walk in both instances.
Уязвимость функций __kvm_at_s12(), __kvm_find_s1_desc_level() модуля arch/arm64/kvm/at.c ядра операционной системы Linux, позволяющая нарушителю оказать воздействие на конфиденциальность, целостность и доступность защищаемой информации
EPSS
7 High
CVSS3