What’s Vulnerable › Vulnerabilities

CVE-2026-53277: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-10-21
• Weakness: CWE-662

Description

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 products

• Linux kernel: from 6.12 before 6.18.36; from 6.19 before 7.0.13; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5, 7.1-rc6 — fixed in 6.18.36, 7.0.13

How to fix

Upgrade to a fixed version: Linux kernel 6.18.36, 7.0.13. Check the vendor advisory for mitigations.

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
• https://access.redhat.com/errata/RHSA-2026:64775
• https://access.redhat.com/security/cve/CVE-2026-53277
• https://bugzilla.redhat.com/show_bug.cgi?id=2492725
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53277.json

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