dbcve.org
Debian LinuxOperating system · Debian

CVE-2024-26739

HIGH · 7.8 CVSS v3.1 Published 2024-04-03
Fix available
A fix is available. Upgrade to 5.10.238 / 5.15.182 or later.
See remediation →
80/100
Remediation priority · High
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: net/sched: act_mirred: don't override retval if we already lost the skb If we're redirecting the skb, and haven't called tcf_mirred_forward(), yet, we need to tell the core to drop the skb by setting the retcode to SHOT. If we have called tcf_mirred_forward(), however, the skb is out of our hands and returning SHOT will lead to UaF. Move the retval override to the error path which actually need it.

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-416

Memory is used after it has been freed, so its contents — now potentially attacker-controlled — drive the program's behaviour. With careful heap grooming this becomes code execution. The fix requires disciplined ownership of memory and often a targeted rework of the object lifecycle.

General guidance for the use after free 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
Debian LinuxOperating system
Affected:= 11.0
Linux KernelOperating system
Affected:>= 4.19, < 5.10.238>= 5.11, < 5.15.182>= 5.16, < 6.1.136>= 6.2, < 6.6.19>= 6.7, < 6.7.7= 6.8

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 5.10.238 / 5.15.182 / 6.1.136 or later
Fixed in 5.10.2385.15.1826.1.136
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 5.10.238+ / 5.15.182+ / 6.1.136+ / 6.6.19+ (or any kernel version after the commit 0117fe0a4615)

  1. Identify the current running kernel version using 'uname -r'
  2. Check if your distribution has released a kernel update for your version (e.g., for Debian 11, check for DSA or security updates)
  3. For Debian 11 (bullseye), apply the kernel update from Debian's security repository: 'apt update && apt install linux-image-5.10.0-*-amd64' or later fixed version
  4. For enterprise Linux distributions (RHEL, CentOS, AlmaLinux), apply the kernel update: 'yum update kernel' or 'dnf update kernel'
  5. Reboot the system to load the fixed kernel: 'systemctl reboot'
  6. Verify the kernel version after reboot with 'uname -r' to confirm the patch is applied
Caveat Kernel upgrades may require system downtime and could have compatibility implications with out-of-tree kernel modules or specific hardware drivers; ensure backups and test in staging first

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 $3,200. Get the upgrade done

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2024-26739 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2024-26739 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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
  • No spam, self-promotion, credentials, or personal data