Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected be04cebf3e78874627dc1042991d5d504464a5cc before 0648b375aa951cc15d9e90f9ac4de71e0b51fa45; affected be04cebf3e78874627dc1042991d5d504464a5cc before 97706097f9b851cfe55c3b00b083dfc2bcf542bc; affected be04cebf3e78874627dc1042991d5d504464a5cc before ec42b4ed1b072ea2d03f086061aa67bad6d8de39; affected be04cebf3e78874627dc1042991d5d504464a5cc before f2ca45b50d4216c9cc7ffabf50d9ad1932209251 |
| Linux / Linux | affected 6.12; unaffected 0 before 6.12; unaffected 6.12.114 through 6.12.*; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0648b375aa951cc15d9e90f9ac4de71e0b51fa45
- https://git.kernel.org/stable/c/97706097f9b851cfe55c3b00b083dfc2bcf542bc
- https://git.kernel.org/stable/c/ec42b4ed1b072ea2d03f086061aa67bad6d8de39
- https://git.kernel.org/stable/c/f2ca45b50d4216c9cc7ffabf50d9ad1932209251
ADP enrichment
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.