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NVD / CVE Program· CNA Linux

CVE-2022-49744: mm/uffd: fix pte marker when fork() without fork event

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: 0.16% (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 2d11727655bf931776fb541f5862daf04bd5bf02, 49d6d7fb631345b0f2957a7c4be24ad63903150f.

Low priority for now. Upgrade to Linux Linux 2d11727655bf931776fb541f5862daf04bd5bf02, 49d6d7fb631345b0f2957a7c4be24ad63903150f 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: mm/uffd: fix pte marker when fork() without fork event Patch series "mm: Fixes on pte markers". Patch 1 resolves the syzkiller report from Pengfei. Patch 2 further harden pte markers when used with the recent swapin error markers. The major case is we should persist a swapin error marker after fork(), so child shouldn't read a corrupted page. This patch (of 2): When fork(), dst_vma is not guaranteed to have VM_UFFD_WP even if src may have it and has pte marker installed. The warning is improper along with the comment. The right thing is to inherit the pte marker when needed, or keep the dst pte empty. A vague guess is this happened by an accident when there's the prior patch to introduce src/dst vma into this helper during the uffd-wp feature got developed and I probably messed up in the rebase, since if we replace dst_vma with src_vma the warning & comment it all makes sense too. Hugetlb did exactly the right here (copy_hugetlb_page_range()). Fix the general path. Reproducer: https://github.com/xupengfe/syzkaller_logs/blob/main/221208_115556_copy_page_range/repro.c Bugzilla report: https://bugzilla.kernel.org/show_bug.cgi?id=216808

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 27, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 5th percentile
CWE
—

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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  • A fix has been released

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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 6.1.11
  • linux linux kernel6.2

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
    • c56d1b62cce83695823c13e52f73e92eb568c0c1 and later · before 2d11727655bf931776fb541f5862daf04bd5bf02affected · git
    • c56d1b62cce83695823c13e52f73e92eb568c0c1 and later · before 49d6d7fb631345b0f2957a7c4be24ad63903150faffected · git
    • before 5.19not affected · semver
    • 6.1.11 and later · up to and including 6.1.*not affected · semver
    • 6.2 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 6.1.11-16.1.11-1
Red Hat:enterprise_linux:9::appstreambpftool-debuginfobefore 0:7.3.0-427.13.1.el9_40:7.3.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-develbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-debug-devel-matchedbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-develbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-64k-devel-matchedbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debug-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debug-develbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-develbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-devel-matchedbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-docbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-rt-debug-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-rt-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-tools-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4
Red Hat:enterprise_linux:9::appstreamkernel-zfcpdump-develbefore 0:5.14.0-427.13.1.el9_40:5.14.0-427.13.1.el9_4

+55

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-2022-49741Mar 27, 2025 · fbdev: smscufx: fix error handling code in ufx_usb_probe
    22Monitor
  • ← EarlierCVE-2022-49742Mar 27, 2025 · f2fs: initialize locks earlier in f2fs_fill_super()
    22Monitor
  • Later →CVE-2022-49745Mar 27, 2025 · fpga: m10bmc-sec: Fix probe rollback
    22Monitor

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 Linux2d11727655bf931776fb541f5862daf04bd5bf02Vendor (CNA)
Linux Linux49d6d7fb631345b0f2957a7c4be24ad63903150fVendor (CNA)
debian:linux6.1.11-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-427.13.1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-427.13.1.el9_4 · 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.

No nightly-computed relations.

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)

—

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