CVE-2026-53210

MEDIUMNVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-06-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

tee: shm: fix shm leak in register_shm_helper()

register_shm_helper() allocates shm before calling iov_iter_npages(). If iov_iter_npages() returns 0, the function jumps to err_ctx_put and leaks shm.

This can be triggered by TEE_IOC_SHM_REGISTER with struct tee_ioctl_shm_register_data where length is 0.

Jump to err_free_shm instead.

CVSS v3
5.5
EG Score
5.5(high)
EPSS
2.7%
KEV
Not listed

Published

June 25, 2026

Last Modified

July 2, 2026

Advisory Details (4)

Auto-updated Jul 3, 2026
No patch confirmed yet.
generic

tee: shm: fix shm leak in register_shm_helper() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dbf779db927414f5b37c1f666013e9b48a88cfde
generic

tee: shm: fix shm leak in register_shm_helper() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c10c9c48b2903f41ed4c532043b0576e86228236
generic

tee: shm: fix shm leak in register_shm_helper() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4277759906b44d923a38c8f59f5576501b187b0d
generic

tee: shm: fix shm leak in register_shm_helper() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/26682f5efc276e3ad96d102019472bfbf03833b2

Vendor Advisories for CVE-2026-53210(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Frequently asked(5)

What is CVE-2026-53210?
CVE-2026-53210 is a medium vulnerability published on June 25, 2026. In the Linux kernel, the following vulnerability has been resolved: tee: shm: fix shm leak in registershmhelper() registershmhelper() allocates shm before calling ioviternpages(). If ioviternpages() returns 0, the function jumps to errctxput and leaks shm. This can be triggered by…
When was CVE-2026-53210 disclosed?
CVE-2026-53210 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53210 actively exploited?
CVE-2026-53210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53210?
CVE-2026-53210 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53210, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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