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NVD / CVE Program· CNA Linux

CVE-2026-93795: blk-cgroup: fix leaks and online flag on radix_tree_insert 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30, 4c0d150fb98ea40760611979f4e664c244b20966, 6e85f02d45b5977c0326a8d854c6db878aa6b34a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30, 4c0d150fb98ea40760611979f4e664c244b20966, 6e85f02d45b5977c0326a8d854c6db878aa6b34a; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: blk-cgroup: fix leaks and online flag on radix_tree_insert failure When radix_tree_insert() fails in blkg_create(), the error path has two issues: 1. blkg->online is set to true unconditionally, even when the blkg was never fully inserted. Move the assignment inside the success block. 2. The error path calls blkg_put() without first calling percpu_ref_kill(). Because the refcount is still in percpu mode, percpu_ref_put() only does this_cpu_sub() without checking for zero, so blkg_release() is never triggered. This permanently leaks the blkg memory, its percpu iostat, policy data, the parent blkg reference, and the cgroup css reference — the latter preventing the cgroup from ever being destroyed. Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern used in blkg_destroy().

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th 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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  • 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

    • 5.0affected
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30affected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before f53945d7c712efe63fadbcc5ffed6370871fd0d3affected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before ada8270ccdb6f212da5eb22614c28ea418746a4aaffected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before c3650be82ef6e7af13b79b2d10a7363bdf54aa7faffected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before 6e85f02d45b5977c0326a8d854c6db878aa6b34aaffected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before 4c0d150fb98ea40760611979f4e664c244b20966affected · git
    • 7fcf2b033b84e261dca283bc2911aaea4b07b525 and later · before dbbca20764382b4d411ec2918f4e278ffe547accaffected · git
    • before 5.0not affected · semver
    • 5.10.271 and later · up to and including 5.10.*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-2026-93793Sep 24, 2026 · wifi: iwlwifi: mvm: validate TX_CMD response layout
    35Monitor
  • ← EarlierCVE-2026-93794Sep 24, 2026 · smb/client: flush dirty data before punching a hole
    0Monitor
  • Later →CVE-2026-93796Sep 24, 2026 · wifi: iwlwifi: pcie: null RX pointers after free
    28Monitor

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 Linux0f840db042caee9d2f3dcdcf97d6674f6e4c1e30Vendor (CNA)
Linux Linux4c0d150fb98ea40760611979f4e664c244b20966Vendor (CNA)
Linux Linux6e85f02d45b5977c0326a8d854c6db878aa6b34aVendor (CNA)
Linux Linuxada8270ccdb6f212da5eb22614c28ea418746a4aVendor (CNA)
Linux Linuxc3650be82ef6e7af13b79b2d10a7363bdf54aa7fVendor (CNA)
Linux Linuxdbbca20764382b4d411ec2918f4e278ffe547accVendor (CNA)
Linux Linuxf53945d7c712efe63fadbcc5ffed6370871fd0d3Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · 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✗ → ✓

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References

Show all references (6 more)

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

All records