CVE-2026-80862
Description
A flaw was found in the Linux kernel's nvme-tcp component. When block devices are created in parallel threads, the page_frag_cache is used in a manner that is not thread-safe. This can lead to incorrect reference counting of memory pages and premature freeing, potentially causing a system crash (Denial of Service).
Statement
A race in the NVMe TCP host path can occur because page_frag_cache is used without serialization while block devices and preallocated requests are initialized in parallel. This can corrupt page reference accounting for PDU backing pages and may cause premature free, followed by warnings in skb_splice_from_iter and random kernel panic. For the CVSS the PR:N is used for the paranoid score because a malicious or compromised NVMe TCP target may influence namespace discovery and request initialization without local code execution on the victim. The issue is best treated as adjacent network reachable in storage fabric deployments rather than a public Internet bug. Impact is at least denial of service via kernel crash and in worst case may allow confidentiality or integrity impact due to memory lifetime corruption and should be reviewed manually.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.1 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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