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NVD / CVE Program· CNA Linux

CVE-2022-49778: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2d458046df634088611d44fd77f45465e833ef78, 5b47348fc0b18a78c96f8474cc90b7525ad1bbfe.

Low priority for now. Upgrade to Linux Linux 2d458046df634088611d44fd77f45465e833ef78, 5b47348fc0b18a78c96f8474cc90b7525ad1bbfe or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud The page table check trigger BUG_ON() unexpectedly when collapse hugepage: ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:82! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750 Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : page_table_check_clear.isra.0+0x258/0x3f0 lr : page_table_check_clear.isra.0+0x240/0x3f0 [...] Call trace: page_table_check_clear.isra.0+0x258/0x3f0 __page_table_check_pmd_clear+0xbc/0x108 pmdp_collapse_flush+0xb0/0x160 collapse_huge_page+0xa08/0x1080 hpage_collapse_scan_pmd+0xf30/0x1590 khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8 khugepaged+0x338/0x518 kthread+0x278/0x2f8 ret_from_fork+0x10/0x20 [...] Since pmd_user_accessible_page() doesn't check if a pmd is leaf, it decrease file_map_count for a non-leaf pmd comes from collapse_huge_page(). and so trigger BUG_ON() unexpectedly. Fix this problem by using pmd_leaf() insteal of pmd_present() in pmd_user_accessible_page(). Moreover, use pud_leaf() for pud_user_accessible_page() too.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.19 and later · before 6.0.10
  • linux linux kernel6.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.19affected
    • 42b2547137f5c974bb1bfd657c869fe96b96d86f and later · before 2d458046df634088611d44fd77f45465e833ef78affected · git
    • 42b2547137f5c974bb1bfd657c869fe96b96d86f and later · before 5b47348fc0b18a78c96f8474cc90b7525ad1bbfeaffected · git
    • before 5.19not affected · semver
    • 6.0.10 and later · up to and including 6.0.*not affected · semver
    • 6.1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.10-16.0.10-1
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-develbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-devel-matchedbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-64k-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-64k-develbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-64k-devel-matchedbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debug-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debug-develbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-develbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-devel-matchedbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-docbefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-rt-64k-debug-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-rt-64k-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-rt-debug-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-rt-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-tools-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-570.12.1.el9_60:5.14.0-570.12.1.el9_6

+68

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49776May 1, 2025 · macvlan: enforce a consistent minimal mtu
    22Monitor
  • ← EarlierCVE-2022-49777May 1, 2025 · Input: i8042 - fix leaking of platform device on module removal
    22Monitor
  • Later →CVE-2022-49779May 1, 2025 · kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2d458046df634088611d44fd77f45465e833ef78Vendor (CNA)
Linux Linux5b47348fc0b18a78c96f8474cc90b7525ad1bbfeVendor (CNA)
debian:linux6.0.10-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-570.12.1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-31739365 days apartcrypto: tegra - Add missing CRYPTO_ALG_ASYNC
    35Monitor
  • CVE-2026-52952419 days apartiommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset
    35Monitor
  • CVE-2025-39803137 days apartscsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()
    31Monitor
  • CVE-2026-31398337 days apartmm/rmap: fix incorrect pte restoration for lazyfree folios
    31Monitor
  • CVE-2026-46117392 days apartRDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss()
    31Monitor
  • CVE-2023-52621401 days apartbpf: Check rcu_read_lock_trace_held() before calling bpf map helpers
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-617 · Reachable Assertion

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records