Vulnerability in Linux kernel (CVE-2026-90301)
Summary
Vulnerability in Linux kernel (CVE-2026-90301). Successful exploitation can lead to full system takeover.
Original description
The description as published by the source.
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: o2hb: quiesce negotiate handlers and timeout work
Heartbeat regions publish struct o2hb_region as the private data for the
NEGO_TIMEOUT and NEGO_APPROVE o2net handlers as soon as make_item()
creates the configfs region. The approve handler can call
o2hb_arm_timeout(), so a peer can touch the region timeout work before
dev_store() has finished building the heartbeat runtime, or after teardown
has started to shut that runtime back down.
The final configfs put also has to keep reg alive until the last in-flight
o2net callback drops its handler reference.
o2net_unregister_handler_list() blocks future handler lookups, but it does
not wait for sc_rx_work that already passed o2net_handler_get(). That
drain needs to cover local listener teardown as well, where the o2net
ordered workqueue may already be inside destroy_workqueue().
Fix the lifetime rule in both directions. Initialize the region delayed
works before publishing reg through the o2net handler table, keep new or
stopping regions non-armable with hr_stopping, and quiesce both delayed
works on failed-start and teardown paths even when no heartbeat thread is
left to call o2hb_disarm_timeout(). Then unregister handlers before
tearing down handler-visible region state and make the drain wait for the
active or destroying o2net ordered workqueue before release frees reg.
The buggy scenario involves two paths, with each column showing the order
wit…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-90301 has been found in Linux kernel.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-90301" on the vendor's site.
CVE-2026-90301 (Linux kernel) — CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Linux kernel.
Check the vendor advisory for the affected versions of Linux kernel.
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web git.kernel.org
- web git.kernel.org
- web nvd.nist.gov
- web github.com
- web git.kernel.org