CVE-2026-53277

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While this is generally\nthe case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the\nrespective walkers without taking kvm->srcu.\n\nFix by acquiring kvm->srcu prior to the table walk in both instances."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable KVM arm64 page-table walks are reached through local KVM execution paths, including `KVM_RUN` handling of trapped AT instructions and guest abort injection, not through network input. An attacker needs local ability to create/control a KVM VM or vCPU context.\nAC:L - The race is attacker-controllable because one thread can drive the vCPU path into the AT/S1PTW page-table walk while another thread mutates memslots with `KVM_SET_USER_MEMORY_REGION`. Nested virtualization support and memslot updates are reasonable KVM deployment conditions, not fragile external prerequisites.\nPR:L - The attacker needs access to KVM device/file descriptors or equivalent VM control, but the relevant ioctls do not require host root or a special capability once `/dev/kvm` access is available. This is therefore low privilege rather than high privilege.\nUI:N - No separate victim action is required after the attacker controls the KVM VM/vCPU and the racing memslot operation. The trigger is programmatic through guest execution and KVM ioctls.\nS:C - The bug is in host KVM handling of guest-controlled translation state, and exploitation can affect the host kernel/hypervisor outside the guest security boundary. KVM guest/VMM-to-host impact is a changed-scope scenario.\nC:H - The missing SRCU lock permits stale or freed memslot data to be used during `kvm_read_guest()` and descriptor updates, creating a use-after-free style memory safety issue. Under the required conservative scoring, this can support high-impact information disclosure.\nI:H - The affected walks can also update guest page-table descriptors and dirty-log state through stale memslot-derived pointers, giving a plausible kernel memory corruption/write surface. Use-after-free style corruption is scored as high integrity impact.\nA:H - At minimum, dereferencing stale memslot structures or dirty bitmap pointers can crash or oops the host kernel. 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While this is generally\nthe case, __kvm_at_s12() and __kvm_find_s1_desc_level() call into the\nrespective walkers without taking kvm->srcu.\n\nFix by acquiring kvm->srcu prior to the table walk in both instances."}], "id": "CVE-2026-53277", "lastModified": "2026-10-21T13:19:13.393", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}, "published": "2026-06-25T09:16:45.897", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0648b375aa951cc15d9e90f9ac4de71e0b51fa45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97706097f9b851cfe55c3b00b083dfc2bcf542bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec42b4ed1b072ea2d03f086061aa67bad6d8de39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f2ca45b50d4216c9cc7ffabf50d9ad1932209251"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:64775"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-53277"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492725"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53277.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-662"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-820"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation", "id": "2492725", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492725"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-820", "details": ["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."], "name": "CVE-2026-53277", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53277\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53277\nhttps://lore.kernel.org/linux-cve-announce/2026062520-CVE-2026-53277-4338@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be04cebf3e78874627dc1042991d5d504464a5cc,97706097f9b851cfe55c3b00b083dfc2bcf542bc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be04cebf3e78874627dc1042991d5d504464a5cc,ec42b4ed1b072ea2d03f086061aa67bad6d8de39)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be04cebf3e78874627dc1042991d5d504464a5cc,f2ca45b50d4216c9cc7ffabf50d9ad1932209251)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T11:45:03.800439+00:00", "updated": "2026-08-12T08:45:02.333544+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}