Is there a patch available for CVE-2026-99103?

Yes, a patch is available for CVE-2026-99103. Update the affected software to the latest version immediately.

Linux CVE-2026-99103

EUVD-2026-112003

2026-10-28 Linux

GHSA-qwjv-757x-9f99

Information Disclosure Linux

View

Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives.

Patch available

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisCVE.org

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

workqueue: Fix unbound pool lifetime for pending pwqs

KASAN reports a use-after-free of an unbound worker_pool in node_activate_pending_pwq():

BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120 Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318

CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: 0x0 (flush-8:0) Call Trace: <TASK> dump_stack_lvl+0x53/0x70 print_report+0xce/0x610 kasan_report+0xce/0x100 _raw_spin_trylock+0x6d/0x120 pwq_dec_nr_in_flight+0x4b4/0xcb0 process_one_work+0x921/0x11a0 worker_thread+0x4d0/0xd20 kthread+0x2de/0x3c0 ret_from_fork+0x3aa/0x620 ret_from_fork_asm+0x1a/0x30 </TASK>

Allocated by task 311: alloc_pwq+0x439/0xca0 apply_wqattrs_prepare+0x75e/0xd10 apply_workqueue_attrs_locked+0x44/0xa0 wq_nice_store+0x350/0x450

Freed by task 0: kfree+0x127/0x3b0 rcu_core+0x523/0x1780 handle_softirqs+0x1b3/0x610

Last potentially related work creation: put_unbound_pool+0x3f3/0x7d0 pwq_release_workfn+0x494/0x8e0 kthread_worker_fn+0x1ff/0x790

Canceling the last inactive work skips pwq_dec_nr_active(), so an empty pwq can remain on pending_pwqs when its refcnt reaches zero. pwq_release_workfn() currently puts the pool before removing that pwq. If this drops the last pool reference, the pool can be RCU-freed while the pwq remains reachable, and node_activate_pending_pwq() may trylock the freed pool->lock.

Remove the pwq from pending_pwqs before putting the pool.

Affected VersionsENISA

Linux patch: 6.8.4

Linux 5797b1c18919cd9c289ded7954383e499f729ce0 <3d2ef2b9f4c084ab498494d26495a82f7e15407b

Linux fc67aebe34f22632ccb22faea48cc4d3134620a2

Linux 5797b1c18919cd9c289ded7954383e499f729ce0 <cf9c8aaea0d47410df8708bec195889f3a85cd3c

Linux 6.8.2 <6.8.4

Linux 6.6.23 <6.6.25

Linux 843288afd3cc6f3342659c6cf81fc47684d25563 <9f5d5aef3072a33c6f9bfb954bb0cba1c2541849

Linux patch: 7.3

Linux 5797b1c18919cd9c289ded7954383e499f729ce0 <f320b85c90fe5fc9d4d06badd450518323a94a7f

Linux patch: 0

Linux 6.9

Linux patch: 6.18.59

Linux patch: 6.6.25

Linux patch: 7.2.13

Linux 5a70baec2294e8a7d0fcc4558741c23e752dad5c <6741dd3fd38e47c08bc39d11ef5fa141fa6d0441

Linux 6.7.11 <6.8

Affected Packages

euvd linux fix: 6.6.25, 6.8, 6.8.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Know when the next one hits your stack

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Lifecycle Timeline

Patch available

Oct 28, 2026 - 11:02 EUVD

CVE Published

Oct 28, 2026 - 10:34 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

Data Quality

2 sources

Confidence: Low

EUVD

CVE.org

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 N/A

Patch available Yes

Active threat No

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.

Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives.

Attack Technique

Information Disclosure MEDIUM

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