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Linux KernelOperating system · Linux

CVE-2022-49675

MEDIUM · 5.5 CVSS v3.1 Published 2025-02-26
Fix available
A fix is available. Upgrade to 5.10.128 / 5.15.52 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: tick/nohz: unexport __init-annotated tick_nohz_full_setup() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it had been broken for a decade. Commit 28438794aba4 ("modpost: fix section mismatch check for exported init/exit sections") fixed it so modpost started to warn it again, then this showed up: MODPOST vmlinux.symvers WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup() The symbol tick_nohz_full_setup is exported and annotated __init Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export. Drop the export because tick_nohz_full_setup() is only called from the built-in code in kernel/sched/isolation.c.

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-908

Memory or a resource is used before it has been initialised, so its contents are whatever happened to be there — sometimes leaking earlier data, sometimes values an attacker can influence. Behaviour becomes unpredictable and occasionally exploitable. Remediation is initialising every resource before use and ensuring initialisation happens on all code paths.

General guidance for the use of uninitialized resource 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, < 5.10.128>= 5.11, < 5.15.52>= 5.16, < 5.18.9= 5.19

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 5.10.128 / 5.15.52 / 5.18.9 or later
Fixed in 5.10.1285.15.525.18.9
Vendor patch git.kernel.org →
Recommended fix High confidence

Kernel 5.10.128+ (for 5.10.x users), 5.15.52+ (for 5.11-5.15.x users), 5.18.9+ (for 5.16-5.18.x users), or migrate from EOL 5.19 to supported 5.15.x LTS or 6.1.x LTS

  1. Identify the currently running kernel version using `uname -r`
  2. Determine which version branch you are on (e.g., 5.10.x, 5.15.x, 5.16.x, 5.17.x, or 5.19)
  3. If on 5.10.x branch: upgrade to kernel version 5.10.128 or later
  4. If on 5.11-5.14.x: upgrade to kernel version 5.15.52 or later
  5. If on 5.16-5.17.x: upgrade to kernel version 5.18.9 or later
  6. If on 5.19.x: upgrade to a supported stable branch (5.19 is end-of-life; migrate to 5.15.x LTS or 6.1.x LTS)
  7. Apply the upgrade via package manager (e.g., `apt-get dist-upgrade`, `yum update`, or distribution-specific kernel update)
  8. Reboot the system to load the fixed kernel
Caveat Upgrading kernel versions may require rebooting and could introduce compatibility changes with out-of-tree kernel modules or proprietary drivers; ensure third-party drivers are compatible with the target kernel version 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-2022-49675 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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