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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98854: of/overlay: only treat a positive changeset id as registered

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: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 0d1525fdcd3355672b7485d61e55df6824ab5ad1, 44081d708b5b885487bac792db78324b7b4c267d, 71065f3d6864a101b77e7af84566757c4df415a0; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.

Low priority for now. Upgrade to Linux Linux 0d1525fdcd3355672b7485d61e55df6824ab5ad1, 44081d708b5b885487bac792db78324b7b4c267d, 71065f3d6864a101b77e7af84566757c4df415a0; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 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: of/overlay: only treat a positive changeset id as registered of_overlay_fdt_apply() stores the idr_alloc() return value in ovcs->id before checking it. On failure the stored id is negative, free_overlay_changeset()'s "if (ovcs->id)" check passes, idr_remove() is called with a negative id and list_del() runs on ovcs->ovcs_list, which is not initialized until after the id allocation. An allocation failure at that point dereferences NULL. Make free_overlay_changeset() treat only a strict-positive id as registered. The rest of the function already copes with a partially-initialized ovcs, so the error path stays a plain goto err_free_ovcs.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 5th 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 · 0.1%

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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

    • 4.15affected
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 7af5d66d0514b8f1d759d0e32b9d4c5d26263e4aaffected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 71065f3d6864a101b77e7af84566757c4df415a0affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before cc688475c56d34a2b584141f9544cbe23360080daffected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before c08a54df9d33dcd6ff089adc9434b2c008af3a39affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 0d1525fdcd3355672b7485d61e55df6824ab5ad1affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before c875407c34dadaef0599834ad9c815f4c9f50d15affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 44081d708b5b885487bac792db78324b7b4c267daffected · git
    • before 4.15not affected · semver
    • 5.15.224 and later · up to and including 5.15.*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 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

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-2026-98852Oct 18, 2026 · net: extend IPv6 exthdr detection of tunneled packets
    0Monitor
  • ← EarlierCVE-2026-98853Oct 18, 2026 · net: gso: limit recursive IP-in-IP segmentation
    0Monitor
  • Later →CVE-2026-98855Oct 18, 2026 · of/overlay: put property on deadprops only after changeset add succeeds
    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 Linux0d1525fdcd3355672b7485d61e55df6824ab5ad1Vendor (CNA)
Linux Linux44081d708b5b885487bac792db78324b7b4c267dVendor (CNA)
Linux Linux71065f3d6864a101b77e7af84566757c4df415a0Vendor (CNA)
Linux Linux7af5d66d0514b8f1d759d0e32b9d4c5d26263e4aVendor (CNA)
Linux Linuxc08a54df9d33dcd6ff089adc9434b2c008af3a39Vendor (CNA)
Linux Linuxc875407c34dadaef0599834ad9c815f4c9f50d15Vendor (CNA)
Linux Linuxcc688475c56d34a2b584141f9544cbe23360080dVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 11, 2026+24 d
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

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

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.

—

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. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (6 more)

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

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