cve-2022-48727
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-08-03 15:24
Severity ?
Summary
KVM: arm64: Avoid consuming a stale esr value when SError occur
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c71dbc8a179d99dd9bb7e7fc1888db613cf85de
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57e2986c3b25092691a6e3d6ee9168caf8978932
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1e852746997500f1873f60b954da5f02cc2dba3
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "timestamp": "2024-06-20T16:20:44.710184Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Avoid consuming a stale esr value when SError occur\n\nWhen any exception other than an IRQ occurs, the CPU updates the ESR_EL2\nregister with the exception syndrome. An SError may also become pending,\nand will be synchronised by KVM. KVM notes the exception type, and whether\nan SError was synchronised in exit_code.\n\nWhen an exception other than an IRQ occurs, fixup_guest_exit() updates\nvcpu-\u003earch.fault.esr_el2 from the hardware register. When an SError was\nsynchronised, the vcpu esr value is used to determine if the exception\nwas due to an HVC. If so, ELR_EL2 is moved back one instruction. This\nis so that KVM can process the SError first, and re-execute the HVC if\nthe guest survives the SError.\n\nBut if an IRQ synchronises an SError, the vcpu\u0027s esr value is stale.\nIf the previous non-IRQ exception was an HVC, KVM will corrupt ELR_EL2,\ncausing an unrelated guest instruction to be executed twice.\n\nCheck ARM_EXCEPTION_CODE() before messing with ELR_EL2, IRQs don\u0027t\nupdate this register so don\u0027t need to check."
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    "cveId": "CVE-2022-48727",
    "datePublished": "2024-06-20T11:13:16.668Z",
    "dateReserved": "2024-06-20T11:09:39.052Z",
    "dateUpdated": "2024-08-03T15:24:59.975Z",
    "state": "PUBLISHED"
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