Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-89576: dm-era: fix shadowed superblock leak on take-snap failure

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 36ff918637e3517f732188a3c39dbeae5b9cfb1b, 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713, 54dd21ca945ecc07885012b9f3e8197f091cfba0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 36ff918637e3517f732188a3c39dbeae5b9cfb1b, 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713, 54dd21ca945ecc07885012b9f3e8197f091cfba0 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: dm-era: fix shadowed superblock leak on take-snap failure metadata_take_snap() bumps the live superblock refcount and then dm_tm_shadow_block() allocates a new block for the metadata snapshot. If the subsequent dm_sm_inc_block() of writeset_tree_root or era_array_root fails, the function only unlocks the clone and returns. The newly allocated shadow block is never returned to the metadata space map, so each failed take-snap permanently leaks one metadata block. Free the clone with dm_sm_dec_block() on those error paths, matching the final step of metadata_drop_snap().

—No exploit Fix available
Published
Sep 11, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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%

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-89576

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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

    • 3.15affected
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before 54dd21ca945ecc07885012b9f3e8197f091cfba0affected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before ef00efb6fcaee88f50891279ceced17c614e97f7affected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before e9fa68b89214bc65af0ef963af7ec3cce9f866e0affected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before dc731d7fddfd6149f5e88ea080475d18c36d3c64affected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before d66ceeefb87ddb097b0546bafc581380b816b048affected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before 36ff918637e3517f732188a3c39dbeae5b9cfb1baffected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before 6876ca330e741fb8886d12070cb6a7f9cb67257eaffected · git
    • eec40579d84873dfb7021eb24c50360f073237c5 and later · before 39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713affected · git
    • before 3.15not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
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-2026-89574Sep 11, 2026 · dm array: validate array block headers on read
    31Monitor
  • ← EarlierCVE-2026-89575Sep 11, 2026 · dm raid1: reserve space for NUL-terminator in build_constructor_string()
    0Monitor
  • Later →CVE-2026-89577Sep 11, 2026 · dm-io: report non-retryable errors separatedly
    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 Linux36ff918637e3517f732188a3c39dbeae5b9cfb1bVendor (CNA)
Linux Linux39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713Vendor (CNA)
Linux Linux54dd21ca945ecc07885012b9f3e8197f091cfba0Vendor (CNA)
Linux Linux6876ca330e741fb8886d12070cb6a7f9cb67257eVendor (CNA)
Linux Linuxd66ceeefb87ddb097b0546bafc581380b816b048Vendor (CNA)
Linux Linuxdc731d7fddfd6149f5e88ea080475d18c36d3c64Vendor (CNA)
Linux Linuxe9fa68b89214bc65af0ef963af7ec3cce9f866e0Vendor (CNA)
Linux Linuxef00efb6fcaee88f50891279ceced17c614e97f7Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
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

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

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✗ → ✓

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