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Linux KernelOperating system · Linux

CVE-2022-49348

MEDIUM · 5.5 CVSS v3.1 Published 2025-02-26
Fix available
A fix is available. Upgrade to 5.10.121 / 5.15.46 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: ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state The EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that we are in the middle of replay the fast commit journal. This was actually a mistake, since the sbi->s_mount_info is initialized from es->s_state. Arguably s_mount_state is misleadingly named, but the name is historical --- s_mount_state and s_state dates back to ext2. What should have been used is the ext4_{set,clear,test}_mount_flag() inline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags. The problem with using EXT4_FC_REPLAY is that a maliciously corrupted superblock could result in EXT4_FC_REPLAY getting set in s_mount_state. This bypasses some sanity checks, and this can trigger a BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter out the EXT4_FC_REPLAY bit for now. We should eventually transition away from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.

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:>= 5.10, < 5.10.121>= 5.11, < 5.15.46>= 5.16, < 5.17.14>= 5.18, < 5.18.3

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 5.10.121 / 5.15.46 / 5.17.14 or later
Fixed in 5.10.1215.15.465.17.14
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel version 5.10.121, 5.15.46, 5.17.14, or 5.18.3 (or later stable release) depending on your distribution's available kernel branches

  1. Identify the current running kernel version using `uname -r`
  2. Verify the affected kernel version falls within the vulnerable ranges: 5.10.x (< 5.10.121), 5.11.x-5.14.x (< 5.15.46), 5.16.x-5.17.x (< 5.17.14), or 5.18.x (< 5.18.3)
  3. Update the package manager and upgrade the Linux kernel package to a fixed version: 5.10.121, 5.15.46, 5.17.14, or 5.18.3 or later
  4. On Debian/Ubuntu: `sudo apt-get update && sudo apt-get dist-upgrade` or `sudo apt-get install linux-image-<version>`
  5. On RHEL/CentOS/Fedora: `sudo yum update kernel` or `sudo dnf update kernel`
  6. Reboot the system to load the new kernel: `sudo reboot`
  7. Verify the new kernel version is running: `uname -r`
Caveat Kernel upgrades may require system reboot and could introduce compatibility issues with out-of-tree drivers or proprietary modules; test in staging if possible

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-2022-49348 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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