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NVD / CVE Program· CNA Linux

CVE-2026-90322: ocfs2/cluster: keep heartbeat local node stable

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 688bc88e2046dd6ce81ce18079b5254cb8dadc0e, 70d7bb7a0be033e5ebe8a2c48974692b1318891c, 8abb2b7c60d2b2c0f40606048c873096c03874d2.

Low priority for now. Upgrade to Linux Linux 688bc88e2046dd6ce81ce18079b5254cb8dadc0e, 70d7bb7a0be033e5ebe8a2c48974692b1318891c, 8abb2b7c60d2b2c0f40606048c873096c03874d2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ocfs2/cluster: keep heartbeat local node stable o2nm_node_local_store() handles local=0 by stopping o2net and setting cl_local_node to O2NM_INVALID_NODE_NUM, but it leaves cl_has_local set. That stale state makes o2nm_this_node() return 255, blocks a later local=1 attempt with -EBUSY, and can feed 255 to heartbeat users that call o2nm_this_node() dynamically. Clearing cl_has_local is required when the local node is reset. But heartbeat threads can still be running at that point. They pin the local node config item at startup, yet o2hb_do_disk_heartbeat() and thread teardown re-read o2nm_this_node() for the local slot and for o2nm_undepend_this_node(). Once local=0 has cleared the live local-node state, those dynamic reads return O2NM_MAX_NODES, which is also the invalid node number 255. Store the local node number in the heartbeat region when the region starts. Use that stable node for heartbeat slot writes/checks, negotiation messages, and the final configfs undepend. Stop the heartbeat loop when the current local node no longer matches the stored node, and clear cl_has_local together with cl_local_node in the local=0 path so nodemanager state matches node removal. Validation reproduced this kernel report: KASAN slab-out-of-bounds in o2hb_do_disk_heartbeat+0x372/0xb30 RIP: 0010:memset+0xf/0x20 Read of size 8 Call trace: dump_stack_lvl+0x66/0xa0 print_report+0xd0/0x630 o2hb_do_disk_heartbeat+0x372/0xb30 (fs/ocfs2/cluster/heartbeat.c:1079) srso_alias_return_thunk+0x5/0xfbef5 __virt_addr_valid+0x188/0x2f0 kasan_report+0xe4/0x120 o2hb_do_disk_heartbeat+0x5/0xb30 (fs/ocfs2/cluster/heartbeat.c:1079) o2hb_thread+0x14e/0x770 kthread_affine_node+0x139/0x180 lockdep_hardirqs_on_prepare+0xda/0x190 trace_hardirqs_on+0x18/0x130 kthread+0x19d/0x1e0 ret_from_fork+0x37a/0x4d0 __switch_to+0x2d5/0x6f0 ret_from_fork_asm+0x1a/0x30

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.16affected
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before d429482a67df16a30afaf9a3f1fe239fe73b44deaffected · git
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before d64708cc119db01fbc55017ee6e987b680ebd59caffected · git
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before 8e5cb90f212fda9f6cd29915a1ed74353108ceb3affected · git
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before 8abb2b7c60d2b2c0f40606048c873096c03874d2affected · git
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before 70d7bb7a0be033e5ebe8a2c48974692b1318891caffected · git
    • a7f6a5fb4bde142b622706e2006ba33f793e13ed and later · before 688bc88e2046dd6ce81ce18079b5254cb8dadc0eaffected · git
    • before 2.6.16not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90320Sep 17, 2026 · ocfs2: validate external xattr entries when reading metadata
    31Monitor
  • ← EarlierCVE-2026-90321Sep 17, 2026 · ocfs2: validate inline xattrs during inode block validation
    31Monitor
  • Later →CVE-2026-90323Sep 17, 2026 · ublk: validate auto buf reg before taking uring_cmd
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux688bc88e2046dd6ce81ce18079b5254cb8dadc0eVendor (CNA)
Linux Linux70d7bb7a0be033e5ebe8a2c48974692b1318891cVendor (CNA)
Linux Linux8abb2b7c60d2b2c0f40606048c873096c03874d2Vendor (CNA)
Linux Linux8e5cb90f212fda9f6cd29915a1ed74353108ceb3Vendor (CNA)
Linux Linuxd429482a67df16a30afaf9a3f1fe239fe73b44deVendor (CNA)
Linux Linuxd64708cc119db01fbc55017ee6e987b680ebd59cVendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records