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CVE-2022-49562

HIGH 7.8 ALL-YEARS

Published 2025-02-26 · Last modified 2026-08-05 · Linux · NVD: Modified

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.

ELEVATED IMPACT

Severe if exploited (CVSS 7.8), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 19th percentile

○ In CISA KEV○ Catalogued PoC

Impact if exploited

7.8CVSS 3.1 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Linux

Products Linux Linux Kernel

Weakness (CWE)

Not classified.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References and research data (JSON)

Vendor product assessments

Showing 32 of 389 vendor product statements; 357 omitted. Read the full vendor advisory.

  • bpftool-debuginfo-0:7.0.0-284.11.1.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-debug-devel-matched-0:5.14.0-284.11.1.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-tools-debuginfo-0:5.14.0-284.11.1.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=ppc64le

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • rtla-0:5.14.0-284.11.1.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=s390x

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-64k-debug-modules-0:5.14.0-284.11.1.el9_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-debug-debuginfo-0:5.14.0-284.11.1.el9_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=aarch64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-debuginfo-0:5.14.0-284.11.1.el9_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-tools-0:5.14.0-284.11.1.el9_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • python3-perf-0:5.14.0-284.11.1.el9_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=ppc64le

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-debuginfo-0:5.14.0-284.11.1.el9_2.x86_64 as a component of Red Hat Enterprise Linux CRB (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • python3-perf-debuginfo-0:5.14.0-284.11.1.el9_2.x86_64 as a component of Red Hat Enterprise Linux CRB (v. 9) · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]_2?arch=x86_64

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Vendor guidance
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • bpftool as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bpftool

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-debug-core as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-core

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-headers as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-headers

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-debug as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-debug

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-devel as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-devel

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt.src as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt?arch=src

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-zfcpdump-devel as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-devel

    • no fix planned: Out of support scope
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt

    • none available: Affected
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-debug-modules as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-debug-modules

    • none available: Affected
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-kvm as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-kvm

    • none available: Affected
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt.src as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt?arch=src

    • none available: Affected
    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-64k-modules-core as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-64k-modules-core

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-devel-matched as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-devel-matched

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-64k-debug-modules-core as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-64k-debug-modules-core

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-debug-modules-extra as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug-modules-extra

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-zfcpdump-devel as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-zfcpdump-devel

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-bootwrapper as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-bootwrapper

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug-kvm

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00
  • python-perf as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/python-perf

    Red Hat · CVE-2022-49562 · Updated 2026-08-04T19:44:45+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxLinux Kernel≥ 5.2 and < 5.17.13
LinuxLinux Kernel≥ 5.18 and < 5.18.2

All CVSS metrics

  • HIGH 7.8 v3.1 · CNA Primary
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • HIGH 7.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • MEDIUM 5.5 v3.1 · NVD Primary
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS