Red Hat Patches 9.8-Rated Linux TCP RCE Flaw While Ubuntu Releases Fixes for Testing
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 9.8
- EPSS
- 1%
Key insight
The report adds to the patch information that Ubuntu's fixes for its newest LTS releases are still in an opt-in testing channel with no regular update date, while Red Hat has already provided fixed kernels.
Description
CVE-2026-98432 is a use-after-free vulnerability in the IPv4 TCP code of the Linux kernel. A remote, unauthenticated attacker can trigger it, and it is rated 9.8. Red Hat has released fixed kernels for Red Hat Enterprise Linux 8, 9, and 10. Ubuntu provides fixes for its three newest long-term-support releases, but these are still in an opt-in testing channel and no date for a regular update is given. There is no information on active exploitation or KEV inclusion.
Risk score
- cvss base
- 98.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 98.00
- industry weight
- 1.10
- freshness factor
- 0.60
- exploitability factor
- 1.00
- days old
- 6.00
- vendor mismatch penalty
- -10.00
Path: operational