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Linux KernelOperating system · Linux

CVE-2026-46168

MEDIUM · 5.5 CVSS v3.1 Published 2026-05-28
Fix available
A fix is available. Upgrade to 5.15.209 / 6.1.175 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: mptcp: fix scheduling with atomic in timestamp sockopt Using lock_sock_fast() (atomic context) around sock_set_timestamp() and sock_set_timestamping() is unsafe, as both helpers can sleep. Replace lock_sock_fast() with sleepable lock_sock()/release_sock() to avoid scheduling while atomic panic.

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

A detailed technical summary for this CVE is being prepared.

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:>= 5.14, < 5.15.209>= 5.16, < 6.1.175>= 6.2, < 6.6.140>= 6.7, < 6.12.88>= 6.13, < 6.18.30>= 6.19, < 7.0.7= 7.1

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 5.15.209 / 6.1.175 / 6.6.140 or later
Fixed in 5.15.2096.1.1756.6.140
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux kernel 5.15.209 (for 5.14.x), 6.1.175 (for 5.16-6.1.x), 6.6.140 (for 6.2-6.6.x), or 6.12.88 (for 6.7-6.12.x) - select the appropriate version based on your distribution's supported stable branch

  1. 1. Identify the currently running Linux kernel version using `uname -r`
  2. 2. Determine which version range your current kernel falls into from: >= 5.14 && < 5.15.209, >= 5.16 && < 6.1.175, >= 6.2 && < 6.6.140, or >= 6.7 && < 6.12.88
  3. 3. For kernels in range >= 5.14 and < 5.15.209: upgrade to kernel 5.15.209 or later in the 5.15.x stable branch
  4. 4. For kernels in range >= 5.16 and < 6.1.175: upgrade to kernel 6.1.175 or later in the 6.1.x stable branch
  5. 5. For kernels in range >= 6.2 and < 6.6.140: upgrade to kernel 6.6.140 or later in the 6.6.x stable branch
  6. 6. For kernels in range >= 6.7 and < 6.12.88: upgrade to kernel 6.12.88 or later in the 6.12.x stable branch
  7. 7. Obtain the kernel from your Linux distribution's official repositories or kernel.org, then reboot into the new kernel
  8. 8. Verify the fix is applied by checking the kernel version and confirming the commit 0949d8bbbedb is included
Caveat Kernel upgrades may require matching user-space tools; ensure distribution repositories are synchronized to avoid version mismatches

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-2026-46168 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
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