CVE-2022-49883 (GCVE-0-2022-49883)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-08-05 08:56
VLAI
Title
KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format On 64 bit host, if the guest doesn't have X86_FEATURE_LM, KVM will access 16 gprs to 32-bit smram image, causing out-ouf-bound ram access. On 32 bit host, the rsm_load_state_64/enter_smm_save_state_64 is compiled out, thus access overflow can't happen.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b443183a25ab61840a12de92f8822849e017b9c8 , < a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494 (git)
Affected: b443183a25ab61840a12de92f8822849e017b9c8 , < 696db303e54f7352623d9f640e6c51d8fa9d5588 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.0.8 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - Exploitation requires local access to KVM (/dev/kvm ioctls) to create a non-LM guest with SMM, inject SMI, and execute RSM; it is not reachable via network packets.\nAC:L - An attacker who can use KVM fully controls CPUID (clearing X86_FEATURE_LM), SMM enablement, SMI injection, and RSM execution, so the OOB path is reliably triggerable with no race or uncontrolled condition.\nPR:L - Creating and running a KVM VM needs only access to /dev/kvm (kvm group or world-accessible on some distros), not real host root/CAP_SYS_ADMIN in the init namespace.\nUI:N - No separate victim action is required; the attacker drives the VM, injects SMI, and executes RSM themselves.\nS:U - The reliable impact is host-kernel stack disclosure into vCPU GPRs recovered via KVM_GET_REGS by host userspace, remaining within the same host OS security authority rather than a guest-observable VM escape.\nC:H - rsm_load_state_32() reads 16 bytes past em_rsm()\u0027s stack buf[512] (GET_SMSTATE offsets for GPRs 12\u201315) and writeback stores that host stack data into vCPU R12\u2013R15, which KVM_GET_REGS exposes (pointers/canaries possible).\nI:N - The bug is an out-of-bounds read only; corrupted values are written into in-bounds emulator/vCPU register slots, with no host memory write or control-flow hijack primitive.\nA:H - The out-of-bounds host stack access can fault into unmapped memory and oops/panic the host kernel, so availability impact is scored High."
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      "product_status:known_affected": "198",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2022-49883.json",
      "version": "11"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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