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Linux KernelOperating system · Linux

CVE-2024-27058

HIGH · 7.8 CVSS v3.1 Published 2024-05-01
Fix available
A fix is available. Upgrade to 6.6.24 / 6.7.12 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

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: tmpfs: fix race on handling dquot rbtree A syzkaller reproducer found a race while attempting to remove dquot information from the rb tree. Fetching the rb_tree root node must also be protected by the dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot() will trigger a warning because it couldn't find a node in the tree, when the real reason was the root node changing before the search starts: Thread 1 Thread 2 - shmem_release_dquot() - shmem_{acquire,release}_dquot() - fetch ROOT - Fetch ROOT - acquire dqio_sem - wait dqio_sem - do something, triger a tree rebalance - release dqio_sem - acquire dqio_sem - start searching for the node, but from the wrong location, missing the node, and triggering a warning.

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-362

Two operations that should be atomic can interleave, so an attacker who wins a narrow timing window reaches an inconsistent, exploitable state. These bugs are subtle and easy to miss in review. Fixing them properly means correct locking or atomic operations around the shared resource.

General guidance for the race condition 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:>= 6.6, < 6.6.24>= 6.7, < 6.7.12>= 6.8, < 6.8.3= 6.9

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 6.6.24 / 6.7.12 / 6.8.3 or later
Fixed in 6.6.246.7.126.8.3
Recommended fix High confidence

Linux kernel 6.6.24+, 6.7.12+, or 6.83+ (depending on your current branch); 6.9 requires vendor patch or newer release

  1. Identify the currently running kernel version using `uname -r`
  2. Check which version range your current kernel falls into (6.6.x, 6.7.x, 6.8.x, or 6.9)
  3. For kernels 6.6.x: upgrade to kernel version 6.6.24 or later
  4. For kernels 6.7.x: upgrade to kernel version 6.7.12 or later
  5. For kernels 6.8.x: upgrade to kernel version 6.8.3 or later
  6. For kernel 6.9.x: apply the vendor patch from git.kernel.org (commit fixing tmpfs dquot rbtree race) or upgrade to a newer stable release if available
  7. Reboot the system to the updated kernel
  8. Verify the fix is applied by checking the kernel version and reviewing the relevant source file (mm/shmem.c) for the dqopt->dqio_sem protection around rb_tree root node fetching
Caveat Kernel upgrades may require system reboot and could introduce compatibility issues with custom modules or specific hardware drivers; ensure all custom kernel modules are rebuilt for the new version

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 $1,950. 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-2024-27058 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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