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NVD / CVE Program· CNA Linux

CVE-2026-52992: fs/adfs: validate nzones in adfs_validate_bblk()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1586bd2d2fb436a26df20a70e78b000d34a7d159, 1f0ed0f57f0fc87e46fe19a05435c214dc464be2, 33aafd2418a59c96c0389d47ea09026661fa9ec6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1586bd2d2fb436a26df20a70e78b000d34a7d159, 1f0ed0f57f0fc87e46fe19a05435c214dc464be2, 33aafd2418a59c96c0389d47ea09026661fa9ec6 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: fs/adfs: validate nzones in adfs_validate_bblk() Reject ADFS disc records with a zero zone count during boot block validation, before the disc record is used. When nzones is 0, adfs_read_map() passes it to kmalloc_array(0, ...) which returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to dm[-1], causing an out-of-bounds write before the allocated buffer. adfs_validate_dr0() already rejects nzones != 1 for old-format images. Add the equivalent check to adfs_validate_bblk() for new-format images so that a crafted image with nzones == 0 is rejected at probe time. Found by syzkaller.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jun 24, 2026
Updated
Jul 14, 2026
EPSS
0.1% · 7th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.6 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.141
  • linux linux kernel6.7 and later · before 6.12.91
  • linux linux kernel6.13 and later · before 6.18.33
  • linux linux kernel6.19 and later · before 7.0.10

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

    • 5.6affected
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before 33aafd2418a59c96c0389d47ea09026661fa9ec6affected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before 1f0ed0f57f0fc87e46fe19a05435c214dc464be2affected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before 6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebcaffected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before a11372a8b1ceaa5e950a84b3b5fbf8228f25e277affected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before 1586bd2d2fb436a26df20a70e78b000d34a7d159affected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before a3fd5dc1c7b0aae947a67dc2e2c037d57557a4deaffected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before 60d82592ac8b5637fbed871381eb0a16df0a492eaffected · git
    • f6f14a0d71b0773a1d4147d1a3c33d537cd213ab and later · before dd9d3e16c2d5fa166e13dce07413be51f42c8f5daffected · git
    • before 5.6not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.10-17.0.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-52987Jun 24, 2026 · drm/amdgpu: avoid double drm_exec_fini() in userq validate
    31Monitor
  • ← EarlierCVE-2026-52989Jun 24, 2026 · nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • Later →CVE-2026-52996Jun 24, 2026 · ksmbd: fix durable fd leak on ClientGUID mismatch in durable v2 open
    22Monitor

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 Linux1586bd2d2fb436a26df20a70e78b000d34a7d159Vendor (CNA)
Linux Linux1f0ed0f57f0fc87e46fe19a05435c214dc464be2Vendor (CNA)
Linux Linux33aafd2418a59c96c0389d47ea09026661fa9ec6Vendor (CNA)
Linux Linux60d82592ac8b5637fbed871381eb0a16df0a492eVendor (CNA)
Linux Linux6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebcVendor (CNA)
Linux Linuxa11372a8b1ceaa5e950a84b3b5fbf8228f25e277Vendor (CNA)
Linux Linuxa3fd5dc1c7b0aae947a67dc2e2c037d57557a4deVendor (CNA)
Linux Linuxdd9d3e16c2d5fa166e13dce07413be51f42c8f5dVendor (CNA)
debian:linux6.1.176-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

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✗ → ✓

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