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NVD / CVE Program· CNA Linux

CVE-2026-92494: ext4: fix buffer_head leak in ext4_init_orphan_info

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 05704335803b69c1bfa8637b7ada942bf2ee8a41, 1399f102d8a1855c1a38506057306ec79d0787d9, 35fc83c65faf7949f5701bb34b20f822560a7718; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 05704335803b69c1bfa8637b7ada942bf2ee8a41, 1399f102d8a1855c1a38506057306ec79d0787d9, 35fc83c65faf7949f5701bb34b20f822560a7718; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: ext4: fix buffer_head leak in ext4_init_orphan_info ext4_init_orphan_info() reads orphan file blocks with ext4_bread() and stores the returned buffer_head in oi->of_binfo[i].ob_bh. If ext4_bread() succeeds but the orphan block magic or checksum validation fails, the function jumps to out_free. However, the old out_free loop starts releasing buffers from i - 1, so the current buffer_head at index i is skipped. This leaks the buffer_head reference obtained by ext4_bread() on the bad magic and bad checksum error paths. Fix this by tracking the number of successfully read buffer_heads and releasing exactly those buffer_heads on the error path.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 11th 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%

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  • 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

    • 5.15affected
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before a9a6ec1298f9bc134b2c5db27d25bb10603b7113affected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before 35fc83c65faf7949f5701bb34b20f822560a7718affected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before 74637f7fef030e5fb2e835b7dfeb05efdc48e0feaffected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before 6ec53ccab0d691b3c73e03d930343ca45987e88daffected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before 1399f102d8a1855c1a38506057306ec79d0787d9affected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before e1e342d9a561c016b8531ec1f4dcefaad9d64954affected · git
    • 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 and later · before 05704335803b69c1bfa8637b7ada942bf2ee8a41affected · git
    • before 5.15not affected · semver
    • 5.15.221 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: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-2026-92492Sep 17, 2026 · cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks
    0Monitor
  • ← EarlierCVE-2026-92493Sep 17, 2026 · cpufreq: amd-pstate-ut: Skip tests when amd-pstate driver is not active
    0Monitor
  • Later →CVE-2026-92495Sep 17, 2026 · RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap
    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 Linux05704335803b69c1bfa8637b7ada942bf2ee8a41Vendor (CNA)
Linux Linux1399f102d8a1855c1a38506057306ec79d0787d9Vendor (CNA)
Linux Linux35fc83c65faf7949f5701bb34b20f822560a7718Vendor (CNA)
Linux Linux6ec53ccab0d691b3c73e03d930343ca45987e88dVendor (CNA)
Linux Linux74637f7fef030e5fb2e835b7dfeb05efdc48e0feVendor (CNA)
Linux Linuxa9a6ec1298f9bc134b2c5db27d25bb10603b7113Vendor (CNA)
Linux Linuxe1e342d9a561c016b8531ec1f4dcefaad9d64954Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
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).

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 (6 more)

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

All records