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Review reviewHigh

CVE-2024-35949

Linux Linux, linux kernel, fedora

In the Linux kernel, the following vulnerability has been resolved: btrfs: make sure that WRITTEN is set on all metadata blocks We previously would call btrfs_check_leaf() if we had the check integrity code enabled, which meant that we could only run the extended leaf checks if we had WRITTEN set on the header flags. This leaves a gap in our checking, because we could end up with corruption on disk where WRITTEN isn't set on the leaf, and then the extended leaf checks don't get run which we rely on to validate all of the item pointers to make sure we don't access memory outside of the exten...

CVSS
7.8
EPSS
0.24%
15.0% percentile
CISA KEV
Not listed
Published
2024.05.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: btrfs: make sure that WRITTEN is set on all metadata blocks We previously would call btrfs_check_leaf() if we had the check integrity code enabled, which meant that we could only run the extended leaf checks if we had WRITTEN set on the header flags. This leaves a gap in our checking, because we could end up with corruption on disk where WRITTEN isn't set on the leaf, and then the extended leaf checks don't get run which we rely on to validate all of the item pointers to make sure we don't access memory outside of the exten...

Affected product and versions

Product
Linux Linux, linux kernel, fedora
Affected versions
>= 85d8a826c7cde17f9cca9c4debecb4538bdb6573 < 9dff3e36ea89e8003516841c27c45af562b6ef44, >= 85d8a826c7cde17f9cca9c4debecb4538bdb6573 < ef3ba8ce8cf7075b716aa4afcefc3034215878ee, >= 85d8a826c7cde17f9cca9c4debecb4538bdb6573 < e03418abde871314e1a3a550f4c8afb7b89cb273, >= 6.5, < 6.6.85, >= 6.7 < 6.8.10, 6.9, 40
Fixed versions
6.6.85, 6.8.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, fedora and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
CVE-2024-35949 — Linux Linux, linux kernel, fedora | SECUFOCUS NOW