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NVD / CVE Program· CNA Linux

CVE-2026-43041: net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.11% (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 0fda873092b541bb5a9b87d728a2429f863f8cfa, 2428083101f6883f979cceffa76cd8440751ffe6, 4b75ff0aedd6ade1018ad4a3a9d8336794e36e42.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0fda873092b541bb5a9b87d728a2429f863f8cfa, 2428083101f6883f979cceffa76cd8440751ffe6, 4b75ff0aedd6ade1018ad4a3a9d8336794e36e42 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: net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak __radix_tree_create() allocates and links intermediate nodes into the tree one by one. If a subsequent allocation fails, the already-linked nodes remain in the tree with no corresponding leaf entry. These orphaned internal nodes are never reclaimed because radix_tree_for_each_slot() only visits slots containing leaf values. The radix_tree API is deprecated in favor of xarray. As suggested by Matthew Wilcox, migrate qrtr_tx_flow from radix_tree to xarray instead of fixing the radix_tree itself [1]. xarray properly handles cleanup of internal nodes — xa_destroy() frees all internal xarray nodes when the qrtr_node is released, preventing the leak. [1] https://lore.kernel.org/all/20260225071623.41275-1-jiayuan.chen@linux.dev/T/

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 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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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

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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 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

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
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before f2dd9aaf6e2861337f5835f877a5b2becaf4b015affected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before 4b75ff0aedd6ade1018ad4a3a9d8336794e36e42affected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3affected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before 0fda873092b541bb5a9b87d728a2429f863f8cfaaffected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before 69402908e277dd164bf8d7c8fd0513c0fac28e9eaffected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before f2664bc4f0f356f17c2094587a2b3665e3867e44affected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before 5d2249eefaca59908fe3c264b8eca526424dcfbeaffected · git
    • 5fdeb0d372ab33b4175043a2a4a1730239a217f1 and later · before 2428083101f6883f979cceffa76cd8440751ffe6affected · 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 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

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-2026-43032May 1, 2026 · NFC: pn533: bound the UART receive buffer
    22Monitor
  • ← EarlierCVE-2026-43039May 1, 2026 · net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
    39Monitor
  • Later →CVE-2026-43043May 1, 2026 · crypto: af-alg - fix NULL pointer dereference in scatterwalk
    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 Linux0fda873092b541bb5a9b87d728a2429f863f8cfaVendor (CNA)
Linux Linux2428083101f6883f979cceffa76cd8440751ffe6Vendor (CNA)
Linux Linux4b75ff0aedd6ade1018ad4a3a9d8336794e36e42Vendor (CNA)
Linux Linux5d2249eefaca59908fe3c264b8eca526424dcfbeVendor (CNA)
Linux Linux69402908e277dd164bf8d7c8fd0513c0fac28e9eVendor (CNA)
Linux Linuxf2664bc4f0f356f17c2094587a2b3665e3867e44Vendor (CNA)
Linux Linuxf2dd9aaf6e2861337f5835f877a5b2becaf4b015Vendor (CNA)
Linux Linuxff134cc43972d7ddceff8cfd36cf6b9eaafc00b3Vendor (CNA)
debian:linux6.1.170-1 · 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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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