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CVE-2026-98171

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs Fix several related bounds checking and pointer lifecy…

Published Oct 6, 2026EPSS 0.54%

Overview

CVE-2026-98171 is a high-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

Fix several related bounds checking and pointer lifecycle issues in

receive_encrypted_standard()'s handling of compound encrypted frames:

- Clear next_buffer after assigning it to server->bigbuf. A stale

next_buffer pointer can lead to a use-after-free on subsequent

error paths.

- Update pdu_length to the decrypted plaintext size (buf_size). Using

the pre-decryption length allows NextCommand to point into stale

ciphertext residue.

- Reject next_cmd values smaller than MID_HEADER_SIZE(server).

- Fix an integer overflow in the upper bound check by verifying

pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the

trailing slice is large enough for a header.

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/05762c5bc1cfdcac36747994fde2c04387a457f1Refgit.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53Refgit.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803Refgit.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4Refgit.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75Refgit.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78Refgit.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cfRefgit.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98171?

CVE-2026-98171 is a high-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-98171?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-98171?

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-2026-98171?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98171 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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