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CVE-2026-93813

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: btrfs: tree-checker: validate INODE_REF's namelen [BUG] A crafted btrfs image can trigger the following crash: BUG: unable t…

Published Sep 24, 2026EPSS 0.13%

Overview

CVE-2026-93813 is a high-severity vulnerability. It was published on September 24, 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:

btrfs: tree-checker: validate INODE_REF's namelen

[BUG]

A crafted btrfs image can trigger the following crash:

BUG: unable to handle page fault for address: ffffd1dc42884000

#PF: supervisor write access in kernel mode

#PF: error_code(0x0002) - not-present page

CPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full) 46af0a92938a63be7132e0dfd71e62327c51d5c2

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022

RIP: 0010:memcpy+0xc/0x10

Call Trace:

<TASK>

read_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]

btrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]

reconnect_path+0x165/0x390

exportfs_decode_fh_raw+0x337/0x400

? drop_caches_sysctl_handler+0xb0/0xb0

</TASK>

---[ end trace 0000000000000000 ]---

RIP: 0010:memcpy+0xc/0x10

Kernel panic - not syncing: Fatal exception

[CAUSE]

T

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/3dc22abc21f5892406c09202fa2627196cc96967Refgit.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6ebRefgit.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121cRefgit.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2Refgit.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86dRefgit.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338

How CyberStrike helps

Frequently asked questions

What is CVE-2026-93813?

CVE-2026-93813 is a high-severity vulnerability. It was published on September 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-93813?

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-2026-93813?

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-2026-93813?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-93813 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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