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

CVE-2026-98831: of/overlay: don't leak fragment references when changeset init fails

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4, 3a23fb158ba517b77a2e5258263bdfdaa480f758, 64517aeaa3d8b158e4d01321a095be48cb551251; 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 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4, 3a23fb158ba517b77a2e5258263bdfdaa480f758, 64517aeaa3d8b158e4d01321a095be48cb551251; 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: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. The store is guarded by ovcs->fragments because on the allocation-failure path cnt still holds the counting pass total while there is no fragments array; everywhere else cnt only counts fully-initialized fragments.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th 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%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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 c654f283d7db20648a5bbf979209f78d4fa9be3faffected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 64517aeaa3d8b158e4d01321a095be48cb551251affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before bbe3dc64b28a14bd9ecb514bbf5115ac8472ed80affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 702b5db6e7b3865be70675d57d6fd7dde80d02b6affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 894573e2fdaeb1b15030b7eebc22615edf28a6cdaffected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 7a46f1917b320cc8762183b802301da02a191b6aaffected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 3a23fb158ba517b77a2e5258263bdfdaa480f758affected · git
    • 61b4de4e0b384f4a22c55c3bada604da49cec4e1 and later · before 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4affected · git
    • before 4.15not 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-2026-98829Oct 18, 2026 · wifi: mac80211: drop oversized fragments to avoid extra_len overflow
    0Monitor
  • ← EarlierCVE-2026-98830Oct 18, 2026 · wifi: wfx: validate MIB read length before copying to caller
    0Monitor
  • Later →CVE-2026-98832Oct 18, 2026 · blk-cgroup: save IRQ state in blkg_tryget_closest()
    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 Linux1d62f0f2bc7edb12ed09f71203df0e47fa4efca4Vendor (CNA)
Linux Linux3a23fb158ba517b77a2e5258263bdfdaa480f758Vendor (CNA)
Linux Linux64517aeaa3d8b158e4d01321a095be48cb551251Vendor (CNA)
Linux Linux702b5db6e7b3865be70675d57d6fd7dde80d02b6Vendor (CNA)
Linux Linux7a46f1917b320cc8762183b802301da02a191b6aVendor (CNA)
Linux Linux894573e2fdaeb1b15030b7eebc22615edf28a6cdVendor (CNA)
Linux Linuxbbe3dc64b28a14bd9ecb514bbf5115ac8472ed80Vendor (CNA)
Linux Linuxc654f283d7db20648a5bbf979209f78d4fa9be3fVendor (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 10, 2026+23 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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records