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CVE-2023-53083

Critical Vulnerability: CVE-2023-53083 — linux — linux_kernel

In the Linux kernel, the following vulnerability has been resolved: nfsd: don't replace page in rq_pages if it's a continuation of last page The splice read calls nfsd_splice_actor to put the pages containing file data into the svc_rqst->rq_pages array. It's possible however to get a splice result that only has a partial page at the end, if (e.g.) the filesystem hands back a short read that doesn't cover the whole page. nfsd_splice_actor will plop the partial page into its rq_pages array and

Sunday, September 27, 2026linuxVulnios Threat Intelligence
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Vulnerability Snapshot

CVE-2023-53083 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:

nfsd: don't replace page in rq_pages if it's a continuation of last page

The splice read calls nfsd_splice_actor to put the pages containing file

data into the svc_rqst->rq_pages array. It's possible however to get a

splice result that only has a partial page at the end, if (e.g.) the

filesystem hands back a short read that doesn't cover the whole page.

nfsd_splice_actor will plop the partial page into its rq_pages array and

return. Then later, when nfsd_splice_actor is called again, the

remainder of the page may end up being filled out. At this point,

nfsd_splice_actor will put the page into the array _again_ corrupting

the reply. If this is done enough times, rq_next_page will overrun the

array and corrupt the trailing fields -- the rq_respages and

rq_next_page pointers themselves.

If we've already added the page to the array in the last pass, don't add

it to the array a second time when dealing with a splice con

Why It Matters

CVE-2023-53083 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-2023-53083.
  • 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-2023-53083 and similar vulnerabilities.

    References & Sources

  • https://git.kernel.org/stable/c/0101067f376eb7b9afd00279270f25d5111a091d
  • https://git.kernel.org/stable/c/12eca509234acb6b666802edf77408bb70d7bfca
  • https://git.kernel.org/stable/c/27c934dd8832dd40fd34776f916dc201e18b319b
  • https://git.kernel.org/stable/c/51ddb84baff6f09ad62b5999ece3ec172e4e3568
  • https://git.kernel.org/stable/c/8235cd619db6e67f1d7d26c55f1f3e4e575c947d

    • 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-2023-53083?

    CVE-2023-53083 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. In the Linux kernel, the following vulnerability has been resolved:

    nfsd: don't replace page in rq_pages if it's a continuation of last page

    The splice read calls nfsd_splice_actor to put the pages

    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-2023-53083. 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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