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Linux KernelOperating system · Linux

CVE-2022-32250

HIGH · 7.8 CVSS v3.1 Published 2022-06-02
Fix available
A fix is available. Upgrade to 4.9.318 / 4.14.283 or later.
See remediation →
80/100
Remediation priority · High
Public exploit Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
net/netfilter/nf_tables_api.c in the Linux kernel through 5.18.1 allows a local user (able to create user/net namespaces) to escalate privileges to root because an incorrect NFT_STATEFUL_EXPR check leads to a use-after-free.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-416

Memory is used after it has been freed, so its contents — now potentially attacker-controlled — drive the program's behaviour. With careful heap grooming this becomes code execution. The fix requires disciplined ownership of memory and often a targeted rework of the object lifecycle.

General guidance for the use after free class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 4.1, < 4.9.318>= 4.10, < 4.14.283>= 4.15, < 4.19.247>= 4.20, < 5.4.198>= 5.5, < 5.10.120>= 5.11, < 5.15.45>= 5.16, < 5.17.13>= 5.18, < 5.18.2
FedoraOperating system
Affected:= 35= 36
Debian LinuxOperating system
Affected:= 9.0= 10.0
H300s FirmwareOperating system
Affected:all versions
H500s FirmwareOperating system
Affected:all versions
H700s FirmwareOperating system
Affected:all versions
H410s FirmwareOperating system
Affected:all versions
H410c FirmwareOperating system
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.9.318 / 4.14.283 / 4.19.247 or later
Fixed in 4.9.3184.14.2834.19.247
Vendor patch www.openwall.com →
Recommended fix High confidence

Linux Kernel 5.4.198 or later (5.4.x branch), or 4.9.318/4.14.283/4.19.247 for respective older branches; alternatively kernel 5.15+ receives the fix

  1. Identify current kernel version using 'uname -r'
  2. For Debian/Ubuntu: Run 'sudo apt-get update && sudo apt-get dist-upgrade' to get the latest kernel with security fixes, or manually install a fixed kernel version (5.4.198 or later for the 5.4.x branch, or newer stable such as 5.15+)
  3. For Fedora: Run 'sudo dnf update kernel' to install the latest patched kernel
  4. For embedded devices (H300s, H500s, H700s, H410s, H410c): Contact the device vendor for firmware updates containing the security fix
  5. Reboot the system after kernel update to load the fixed version
  6. Verify the fix by checking 'uname -r' shows a version >= the fixed version for your branch
Caveat Kernel upgrades may require rebuilding third-party kernel modules (like proprietary GPU drivers); ensure compatibility with new kernel before rebooting

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-32250 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data