Is there a patch available for CVE-2026-98984?

Yes, a patch is available for CVE-2026-98984. Update the affected software to the latest version immediately.

Linux CVE-2026-98984

EUVD-2026-108778

2026-10-23 Linux

GHSA-j5f8-8hqx-2hcr

Information Disclosure Linux

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Monitor Track and reassess. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

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

dcache: don't put a mountpoint on a dentry that's being removed

rmdir(), unlink() and rename() call dont_mount() on the victim and then detach_mounts() with the victim's inode locked. do_lock_mount() takes the inode lock of the mountpoint and checks cant_mount() so a mount can't show up after detach_mounts().

But attach_recursive_mnt() makes a second mountpoint for the root of the source mount so that the mounts already located at the destination can be put on top of it. No inode is locked for that one and d_set_mounted() only refuses a dentry that is unlinked. Between detach_mounts() and d_delete() the victim is still hashed:

rmrace: b passed dont_mount() and detach_mounts(), sleeping T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 () T1: rmdir(/tmp/plcant/d/b) = 0 errno 0 109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw 108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw

A bind mount of the directory that's being removed is moved beneath an existing mount while the rmdir() is located between the two calls. The mount ends up on the removed directory and nothing will ever detach it.

Check cant_mount() in d_set_mounted() as well. dont_mount() raises the flag under d_lock before detach_mounts() runs so either the mountpoint is set first and detach_mounts() finds the mount or the flag is seen and the mount is refused.

Affected VersionsENISA

Linux 5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf

Linux patch: 7.3

Linux 808e83e5add13152bd4a88346487de68395c136b

Linux 1064f874abc0d05eeed8993815f584d847b72486 <793cb67b0f52d00c67bd0e76bc57455b5c70ebb8

Linux 1064f874abc0d05eeed8993815f584d847b72486 <75f4197f1e11d2eb75c2d6f916a7d4764db621e5

Linux 4.4.54 <4.5

Linux 1064f874abc0d05eeed8993815f584d847b72486 <390ddcea2a8aca411b931a8e2863a80ccca8d2b3

Linux 839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7

Linux patch: 6.6.160

Linux 1064f874abc0d05eeed8993815f584d847b72486 <30a1625022411a387cce9239408ece9955bc9c58

Linux 6de9d08a9718ee9c12ba6343c50141c2d633e3dc

Linux 4.10.3 <4.11

Linux patch: 0

Linux patch: 6.18.57

Linux patch: 7.2.11

Linux 4.1.40 <4.2

Linux patch: 6.12.113

Linux 4.9.15 <4.10

Linux 4.11

Linux 1064f874abc0d05eeed8993815f584d847b72486 <5e6bfd9f249f2c74bb63c0f06ad959da3bee0971

Affected Packages

euvd linux fix: 4.2, 4.5, 4.10, 4.11

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Lifecycle Timeline

Patch available

Oct 23, 2026 - 13:17 EUVD

CVE Published

Oct 23, 2026 - 12:20 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 90% exploitable

Data Quality

3 sources

Confidence: Low

EUVD

CVE.org

EPSS MSRC

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.