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Linux KernelOperating system · Linux

CVE-2024-46791

MEDIUM · 5.5 CVSS v3.1 Published 2024-09-18
Fix available
A fix is available. Upgrade to 5.10.226 / 5.15.167 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: can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open The mcp251x_hw_wake() function is called with the mpc_lock mutex held and disables the interrupt handler so that no interrupts can be processed while waking the device. If an interrupt has already occurred then waiting for the interrupt handler to complete will deadlock because it will be trying to acquire the same mutex. CPU0 CPU1 ---- ---- mcp251x_open() mutex_lock(&priv->mcp_lock) request_threaded_irq() <interrupt> mcp251x_can_ist() mutex_lock(&priv->mcp_lock) mcp251x_hw_wake() disable_irq() <-- deadlock Use disable_irq_nosync() instead because the interrupt handler does everything while holding the mutex so it doesn't matter if it's still running.

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-667

Shared resources are accessed without correct locking, so concurrent operations interleave into inconsistent — and sometimes exploitable — states, or deadlock the service outright. These bugs are subtle and timing-dependent. The fix is correct, consistent locking or atomic operations around every shared resource.

General guidance for the improper locking 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:>= 5.5, < 5.10.226>= 5.11, < 5.15.167>= 5.16, < 6.1.110>= 6.2, < 6.6.51>= 6.7, < 6.10.10= 6.11

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 5.10.226 / 5.15.167 / 6.1.110 or later
Fixed in 5.10.2265.15.1676.1.110
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux kernel >= 5.10.226, >= 5.15.167, >= 6.1.110, or >= 6.6.51 (depending on your current branch)

  1. Identify the current running kernel version using 'uname -r'
  2. Check which distribution-specific kernel package is in use (e.g., for Debian/Ubuntu: dpkg -l | grep linux-image, for RHEL/CentOS: rpm -qa | grep kernel)
  3. Upgrade the kernel package to a version meeting or exceeding the fixed release for your branch: 5.10.226, 5.15.167, 6.1.110, or 6.6.51
  4. Reboot the system to load the new kernel
  5. Verify the new kernel version is running with 'uname -r'
  6. If using a distribution kernel (e.g., from Ubuntu, Debian, RHEL), ensure the distribution has released a kernel update containing this fix
Caveat Kernel upgrades may require driver recompilation or system restart; ensure compatibility with custom modules before upgrading

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 $1,600. 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-2024-46791 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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