Is there a patch available for CVE-2026-98801?

Yes, a patch is available for CVE-2026-98801. Update the affected software to the latest version immediately.

Linux CVE-2026-98801

EUVD-2026-103886

2026-10-18 Linux

GHSA-4vp5-jwr6-3q9m

Buffer Overflow Linux

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

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AnalysisCVE.org

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

net: restrict SO_RESERVE_MEM to TCP sockets and cap max value

Commit 2bb2f5fb21b0 ("net: add new socket option SO_RESERVE_MEM") and commit d00c8ee31729 ("net: fix possible NULL deref in sock_reserve_memory") only checked sk_has_account(sk), which is true for both TCP and UDP sockets.

However, SO_RESERVE_MEM and sk_unused_reserved_mem() are currently only supported by TCP:

On UDP sockets, sk->sk_forward_alloc is protected by

sk->sk_receive_queue.lock, whereas sock_reserve_memory() and sock_release_reserved_memory() only acquire lock_sock(sk). Concurrent UDP packet reception/release and setsockopt(SO_RESERVE_MEM) corrupt sk_forward_alloc and memcg accounting.

udp_rmem_release() reclaims excess sk_forward_alloc without

accounting for sk_unused_reserved_mem(sk).

Restrict sock_reserve_memory() to TCP sockets (sk_is_tcp(sk)) for now. Supporting SO_RESERVE_MEM for UDP (acquiring sk_receive_queue.lock and honoring sk_unused_reserved_mem() in udp_rmem_release()) can be done in a future net-next series if needed.

In addition, reject val > SZ_1G with -EINVAL in sk_setsockopt(SO_RESERVE_MEM). Without an upper bound, values near INT_MAX cause sk_mem_pages(delta) and (pages << PAGE_SHIFT) to overflow 32-bit signed int, corrupting sk->sk_forward_alloc and sk->sk_reserved_mem. Using a page-aligned cap (SZ_1G) ensures that the page-rounded sk->sk_reserved_mem reported by getsockopt(SO_RESERVE_MEM) can always be passed back to setsockopt(SO_RESERVE_MEM).

Affected VersionsENISA

Linux 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 <37e02c42a00be692c06343e11779aadc45f45971

Linux patch: 6.18.56

Linux patch: 7.3-rc6

Linux patch: 7.2.10

Linux patch: 0

Linux 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 <5069ce898148bd799395c5a464e006cbb840f188

Linux 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 <a467b05b201b5c26be52ed3081992fa9c0387648

Linux 5.16

Linux 2bb2f5fb21b0486ff69b7b4a1fe03a760527d133 <492e04f9a00f3cc88a1f6899417b10f3019a624e

Linux patch: 6.12.113

Affected Packages

euvd linux no fix

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 18, 2026 - 17:19 EUVD

CVE Published

Oct 18, 2026 - 15:48 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

Data Quality

1 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

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.