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Linux KernelOperating system · Linux

CVE-2022-49931

MEDIUM · 5.5 CVSS v3.1 Published 2025-05-01
Fix available
A fix is available. Upgrade to 5.4.224 / 5.10.154 or later.
See remediation →
57/100
Remediation priority · Elevated
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
In the Linux kernel, the following vulnerability has been resolved: IB/hfi1: Correctly move list in sc_disable() Commit 13bac861952a ("IB/hfi1: Fix abba locking issue with sc_disable()") incorrectly tries to move a list from one list head to another. The result is a kernel crash. The crash is triggered when a link goes down and there are waiters for a send to complete. The following signature is seen: BUG: kernel NULL pointer dereference, address: 0000000000000030 [...] Call Trace: sc_disable+0x1ba/0x240 [hfi1] pio_freeze+0x3d/0x60 [hfi1] handle_freeze+0x27/0x1b0 [hfi1] process_one_work+0x1b0/0x380 ? process_one_work+0x380/0x380 worker_thread+0x30/0x360 ? process_one_work+0x380/0x380 kthread+0xd7/0x100 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x1f/0x30 The fix is to use the correct call to move the list.

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-476

The code follows a pointer that is null, crashing the process. An attacker who can reliably trigger it turns the crash into a denial of service. The fix is checking for null before use and handling the failure path gracefully.

General guidance for the null pointer dereference 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:>= 5.4.157, < 5.4.224>= 5.10.77, < 5.10.154>= 5.14.16, < 5.15.78>= 5.16, < 6.0.8= 6.1

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
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 5.4.224 / 5.10.154 / 5.15.78 or later
Fixed in 5.4.2245.10.1545.15.78
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel 5.4.224+, 5.10.154+, 5.15.78+, or 6.0.8+ (or the latest stable kernel in your respective branch)

  1. 1. Identify the currently running Linux kernel version using `uname -r`
  2. 2. Check if the running version falls within the affected range: 5.4.157-5.4.223, 5.10.77-5.10.153, 5.14.16-5.15.77, or 5.16-6.0.7
  3. 3. If affected, schedule a maintenance window for the kernel upgrade
  4. 4. Update the kernel package to a fixed version: 5.4.224+, 5.10.154+, 5.15.78+, or 6.0.8+ depending on your kernel branch
  5. 5. Reboot the system to load the new kernel
  6. 6. Verify the fix is applied by checking the kernel version with `uname -r` and confirming it is at or above the minimum fixed version for your branch
  7. 7. If using a distribution kernel (e.g., RHEL, Ubuntu, Debian), apply the distribution's security update which includes this fix
Caveat Major kernel upgrades (e.g., 5.x to 6.x) may introduce compatibility issues with proprietary drivers or custom modules; test thoroughly in a non-production environment first

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 $2,850. Get the upgrade done

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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-2022-49931 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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