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CVE-2026-64074

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap statmount_mnt_idmap() writes one mapping with seq_printf() an…

Published Jul 19, 2026EPSS 0.17%

Overview

CVE-2026-64074 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap

statmount_mnt_idmap() writes one mapping with seq_printf() and then

manually advances seq->count to include the NUL separator.

If seq_printf() overflows, seq_set_overflow() sets seq->count to

seq->size. The manual seq->count++ changes this to seq->size + 1.

seq_has_overflowed() then no longer detects the overflow. The corrupted

count returns to statmount_string(), which later executes:

seq->buf[seq->count++] = '\0';

This causes a 1-byte NULL out-of-bounds write on the dynamically

allocated seq buffer.

Fix this by checking for overflow immediately after seq_printf().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/93614949dc86f068e3c32c32cf1ee2a2323177a7Refgit.kernel.org/stable/c/a3bf0f28d4ba16e1f35f8c983bb04426b87e2a78Refgit.kernel.org/stable/c/e37ea2c6f17f273813ea4e8e94c102591d598ce1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64074?

CVE-2026-64074 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64074?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64074?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64074?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64074 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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