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Vulnerability · Published Feb 26, 2025 · Assigned by Linux

CVE-2022-49562KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 79.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Use __try_cmpxchg_user() to update guest PTE A/D bits Use the recently introduced __try_cmpxchg_user() to update guest PTE A/D bits instead of mapping the PTE into kernel address space. The VM_PFNMAP path is broken as it assumes that vm_pgoff is the base pfn of the mapped VMA range, which is conceptually wrong as vm_pgoff is the offset relative to the file and has nothing to do with the pfn. The horrific hack worked for the original use case (backing guest memory with /dev/mem), but leads to accessing "random" pfns for pretty much any other VM_PFNMAP case.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.18.2-1DEBIAN-CVE-2022-49562
Debian:13linux5.18.2-1DEBIAN-CVE-2022-49562
Debian:14linux5.18.2-1DEBIAN-CVE-2022-49562
Ubuntu:22.04:LTSlinux5.15.0-202.212USN-8961-1
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-aws5.15.0-1119.126USN-8961-1
Ubuntu:22.04:LTSlinux-aws5.15.0-1119.126UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure5.15.0-1125.134UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure5.15.0-1125.134USN-8961-1
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1124.133USN-8962-1
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1124.133UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gcp5.15.0-1120.130UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gcp5.15.0-1120.130USN-8961-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gke5.15.0-1115.121UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-gke5.15.0-1115.121USN-8961-1
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1102.110USN-8961-1
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1102.110UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-ibm5.15.0-1113.117UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-ibm5.15.0-1113.117USN-8961-1
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1114.120UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1114.120USN-8961-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1111.116USN-8961-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1111.116UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-197.207USN-8961-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-197.207UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1114.115USN-8961-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1114.115UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1070.72UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1070.72USN-8963-1
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1059.59UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1059.59USN-8963-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-oracle5.15.0-1116.122USN-8961-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1116.122UBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2022-49562
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2022-49562
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2022-49562

Affected products (as reported)

VendorProductVersions
Linux Linux bd53cb35a3e9adb73a834a36586e9ad80e877767 – before 38b888911e8dc89b89d8147cfb1d2dbe6373bf78bd53cb35a3e9adb73a834a36586e9ad80e877767 – before 8089e5e1d18402fb8152d6b6815450a36fffa9b0bd53cb35a3e9adb73a834a36586e9ad80e877767 – before f122dfe4476890d60b8c679128cd2259ec96a24c
Linux Linux 5.2

References