# CVE-2026-74469 — Linux

> As of 2026-08-19, CVE-2026-74469 is a HIGH-severity vulnerability in Linux, CVSS v3.1 8.8, EPSS 1.0% (64.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-74469, most recently “"LPE Quartet": Public Exploits Released for Four Linux Kernel Local-Root Flaws (DirtyAH6, TUNderflow, PPPoEject, DiagSpill)”.

**Last updated:** 2026-08-19

## What is CVE-2026-74469?

In the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.

Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 69 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 1.0% probability of exploitation in the next 30 days, higher than 64.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-15, last modified 2026-08-19

## Is CVE-2026-74469 being exploited?

Weaponised exploit code for CVE-2026-74469 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

- [suominen/diagspill](https://github.com/suominen/diagspill) (github)
- [0xBlackash/CVE-2026-74469](https://github.com/0xBlackash/CVE-2026-74469) (github)
- [HORKimhab/CVE-2026-74469](https://github.com/HORKimhab/CVE-2026-74469) (github)

## Affected products and versions

- [Linux](https://intel.threadlinqs.com/vendors/linux): Linux

## How to fix CVE-2026-74469

No vendor patch reference has been recorded for CVE-2026-74469 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-74469

1 tracked threat in the Threadlinqs corpus references CVE-2026-74469, either in the campaign’s CVE list or as an indicator on the campaign record.

- ["LPE Quartet": Public Exploits Released for Four Linux Kernel Local-Root Flaws (DirtyAH6, TUNderflow, PPPoEject, DiagSpill)](https://intel.threadlinqs.com/threat/TL-2026-2572) — HIGH · 2026-09-18

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8)
- [git.kernel.org (dfea32dd76f390e3155177b0038cc47b01386198)](https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198)
- [git.kernel.org (80f48523a0fe42db2e7375dff4e38a25c117090a)](https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a)
- [git.kernel.org (546221b86ceeba0d8fec92d46a0604bb7b62be07)](https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07)
- [git.kernel.org (09e722030e8148ba4ed1e42c6b2ea57bda9f9895)](https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895)

_Showing 5 of 8 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-74469
Full detection coverage and IOCs for threats exploiting CVE-2026-74469 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp