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NVD / CVE Program· CNA Linux

CVE-2022-50206: arm64: fix oops in concurrently setting insn_emulation sysctls

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: 0.24% (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 04549063d5701976034d8c2bfda3d3a8cbf0409f, 07022e07017ee5540f5559b0aeb916e8383c1e1a, 353b4673d01c512303c45cf2346f630cda73b5c9.

Low priority for now. Upgrade to Linux Linux 04549063d5701976034d8c2bfda3d3a8cbf0409f, 07022e07017ee5540f5559b0aeb916e8383c1e1a, 353b4673d01c512303c45cf2346f630cda73b5c9 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: fix oops in concurrently setting insn_emulation sysctls emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself: | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200 To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 18, 2025
Updated
Aug 15, 2026
EPSS
0.2% · 15th 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 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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 kernelbefore 4.14.291
  • linux linux kernel4.15 and later · before 4.19.256
  • linux linux kernel4.20 and later · before 5.4.211
  • linux linux kernel5.5 and later · before 5.10.137
  • linux linux kernel5.11 and later · before 5.15.61
  • linux linux kernel5.16 and later · before 5.18.18
  • linux linux kernel5.19 and later · before 5.19.2

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

    • 3.19affected
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before 9d5fec6ba2e4117d196a8259ab54615ffe562460affected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before b51881b1da57fe9877125dfdd0aac5172958fcfdaffected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before 04549063d5701976034d8c2bfda3d3a8cbf0409faffected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before 353b4673d01c512303c45cf2346f630cda73b5c9affected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before cc69ef95988b9ef2fc730ec452a7441efb90ef5eaffected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before 6a2fd114678d7fc1b5a0f8865ae98f1c17787455affected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before 07022e07017ee5540f5559b0aeb916e8383c1e1aaffected · git
    • 587064b610c703f259317d00dc37bf6d40f4fc74 and later · before af483947d472eccb79e42059276c4deed76f99a6affected · git
    • before 3.19not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.2-16.0.2-1

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-2022-50204Jun 18, 2025 · ARM: OMAP2+: pdata-quirks: Fix refcount leak bug
    22Monitor
  • ← EarlierCVE-2022-50205Jun 18, 2025 · ext2: Add more validity checks for inode counts
    22Monitor
  • Later →CVE-2022-50207Jun 18, 2025 · ARM: bcm: Fix refcount leak in bcm_kona_smc_init
    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 Linux04549063d5701976034d8c2bfda3d3a8cbf0409fVendor (CNA)
Linux Linux07022e07017ee5540f5559b0aeb916e8383c1e1aVendor (CNA)
Linux Linux353b4673d01c512303c45cf2346f630cda73b5c9Vendor (CNA)
Linux Linux6a2fd114678d7fc1b5a0f8865ae98f1c17787455Vendor (CNA)
Linux Linux9d5fec6ba2e4117d196a8259ab54615ffe562460Vendor (CNA)
Linux Linuxaf483947d472eccb79e42059276c4deed76f99a6Vendor (CNA)
Linux Linuxb51881b1da57fe9877125dfdd0aac5172958fcfdVendor (CNA)
Linux Linuxcc69ef95988b9ef2fc730ec452a7441efb90ef5eVendor (CNA)
debian:linux6.0.2-1 · Debian:12Package 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)

CWE-476 · NULL Pointer Dereference

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 (7 more)

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

All records