CVE-2026-90322None▾ Sunlit

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 le…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Sep 17, 2026

Updated

Sep 17, 2026

CVSS

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Vendor

Linux

Product

Linux

CWE

—

Depth score

3 · Minimal

EPSS

0.20% · p10

Platforms

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Source

NVD

Vector

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EPSS history

Exploit-prediction probability, daily snapshots since Sep 19.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 8 days

Sep 17, 2026Published
Disclosed via NVD
Sep 19, 2026EPSS first tracked
0.2%
Sep 25, 2026EPSS peak
0.2% → 0.2%

Linux #nvd #cve.org

Affected

Linux >= a7f6a5fb4bde142b622706e2006ba33f793e13ed < 8e5cb90f212fda9f6cd29915a1ed74353108ceb3
Linux >= a7f6a5fb4bde142b622706e2006ba33f793e13ed < 8abb2b7c60d2b2c0f40606048c873096c03874d2
Linux >= a7f6a5fb4bde142b622706e2006ba33f793e13ed < 70d7bb7a0be033e5ebe8a2c48974692b1318891c
Linux >= a7f6a5fb4bde142b622706e2006ba33f793e13ed < 688bc88e2046dd6ce81ce18079b5254cb8dadc0e
Linux 2.6.16

Full technical detail▾

Overview

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

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org