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CVE-2024-57947

Critical Vulnerability: CVE-2024-57947 — linux — linux_kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_set_pipapo: fix initial map fill The initial buffer has to be inited to all-ones, but it must restrict it to the size of the first field, not the total field size. After each round in the map search step, the result and the fill map are swapped, so if we have a set where f->bsize of the first element is smaller than m->bsize_max, those one-bits are leaked into future rounds result map. This makes pipapo find an

Tuesday, August 4, 2026linuxVulnios Threat Intelligence
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Vulnerability Snapshot

CVE-2024-57947 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.

Affected technology: linux_kernel.

Executive Summary

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_set_pipapo: fix initial map fill

The initial buffer has to be inited to all-ones, but it must restrict

it to the size of the first field, not the total field size.

After each round in the map search step, the result and the fill map

are swapped, so if we have a set where f->bsize of the first element

is smaller than m->bsize_max, those one-bits are leaked into future

rounds result map.

This makes pipapo find an incorrect matching results for sets where

first field size is not the largest.

Followup patch adds a test case to nft_concat_range.sh selftest script.

Thanks to Stefano Brivio for pointing out that we need to zero out

the remainder explicitly, only correcting memset() argument isn't enough.

Why It Matters

CVE-2024-57947 is rated CRITICAL severity, requiring immediate attention from security teams.

CVSS Base Score: 9.8/10

Affected Technologies

Vendors: linux

Products: linux_kernel

🛡️What Defenders Should Check

  • Check if you are affected — Review your asset inventory for products listed in CVE-2024-57947.
  • Apply available patches — Visit vendor advisories for the latest security updates.
  • Monitor for exploitation — Check your SIEM/IDS logs for related indicators.

    • Use Vulnios to continuously monitor your exposure to CVE-2024-57947 and similar vulnerabilities.

    References & Sources

  • https://git.kernel.org/stable/c/69b6a67f7052905e928d75a0c5871de50e686986
  • https://git.kernel.org/stable/c/77bf0c4ab928ca4c9a99311f4f70ba0c17fecba9
  • https://git.kernel.org/stable/c/791a615b7ad2258c560f91852be54b0480837c93
  • https://git.kernel.org/stable/c/8058c88ac0df21239daee54b5934d5c80ca9685f
  • https://git.kernel.org/stable/c/957a4d1c4c5849e4515c9fb4db21bf85318103dc
  • https://git.kernel.org/stable/c/9625c46ce6fd4f922595a4b32b1de5066d70464f

    • How Vulnios Detects This

    Vulnios scans for this vulnerability using Trivy and Grype for CVE matching against your container images and OS package manifests. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.

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    Affected Products

    linux_kernel

    Sources

    Related Threat Alerts

    Frequently Asked Questions

    What is CVE-2024-57947?

    CVE-2024-57947 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. In the Linux kernel, the following vulnerability has been resolved:

    netfilter: nf_set_pipapo: fix initial map fill

    The initial buffer has to be inited to all-ones, but it must restrict

    it to the siz

    Am I affected?

    Check whether your environment runs linux_kernel. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.

    How urgent is the response?

    Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.

    How do I remediate?

    Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.

    Where can I track exploitation activity?

    Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2024-57947. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.

    How does Vulnios help with this?

    Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.

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