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CVE-2026-53296 Linux CVE debrief

CVE-2026-53296 is a Linux kernel vulnerability affecting the mailbox-test component. The vulnerability involves a probe error that prevents freeing previously obtained channels, potentially leading to a memory leak and use-after-free (UAF) scenarios. The Linux kernel maintainers have resolved this issue by ensuring that channels are freed on probe error. This fix prevents potential memory leaks and UAF scenarios because the client structure will be removed even if the probe fails. The Common Vulnerabilities and Exposures (CVE) score and severity for this vulnerability are not provided. The CVE was published on 2026-06-26T20:17:22.557Z and last modified on 2026-06-30T14:44:27.313Z.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-26
Original CVE updated
2026-07-08
Advisory published
2026-06-26
Advisory updated
2026-07-08

Who should care

System administrators and security teams responsible for Linux kernel-based systems should be aware of this vulnerability. They should assess their systems for exposure and apply patches or mitigations as necessary. Linux distribution maintainers and kernel developers may also need to review and integrate the fix into their products.

Technical summary

The vulnerability exists in the mailbox-test component of the Linux kernel. Specifically, the probe error handling does not free the previously obtained channels. This oversight can lead to memory leaks and use-after-free scenarios. The fix ensures that channels are properly freed during probe error handling, preventing potential memory leaks and UAF scenarios. The client structure is removed even if the probe fails, which helps in maintaining the integrity of the system.

Defensive priority

Apply the patch or update to the Linux kernel to fix the mailbox-test probe error. Review system configurations and ensure that Linux kernel updates are properly applied and tested.

Recommended defensive actions

  • Apply the official patch or update to the Linux kernel.
  • Review system configurations for exposure to this vulnerability.
  • Ensure that Linux kernel updates are properly applied and tested.
  • Monitor system logs for potential memory leak or UAF activity.
  • Consider implementing compensating controls to detect and prevent exploitation.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. The Linux kernel source code references are available for further analysis. However, the exact scope of affected systems and potential exploitation details are not provided.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53296 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53296

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53296 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53296

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/02beb178e2e159daeb8f992d7abb16a37da31664

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6b

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/15c4cc3850cfe1b973eb7b63c02314b267f06a64

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/187069ccc3474516af32350e20d7e449160fa6de

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6c6ce2ccb4fcf1617fec83f91b21aa0265f30701

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/742001919653e7313b4e91780c5d108be1692365

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/81c9e7e4030e71391ab479c4c6e17b64802577aa

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.