CVE-2026-43041: Linux kernel · net: qrtr: replace qrtr_tx_flow radix_tree with xarray to fix memory leak
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:20 UTC
Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3, f2664bc4f0f356f17c2094587a2b3665e3867e44, f2dd9aaf6e2861337f5835f877a5b2becaf4b015 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available and has been applied by migrating qrtr_tx_flow from radix_tree to xarray. Users should update to the fixed Linux kernel versions that include this change to prevent the memory leak.
Description
A memory leak vulnerability in the Linux kernel's net: qrtr component was fixed by replacing the deprecated radix_tree with xarray for managing qrtr_tx_flow. The issue involved orphaned internal nodes in the radix_tree that were not reclaimed on allocation failure, causing a memory leak. The migration to xarray ensures proper cleanup of internal nodes when the qrtr_node is released.
References
- git.kernel.org/stable/c/f2dd9aaf6e2861337f5835f877a5b2becaf4b015 (opens in a new tab)
- git.kernel.org/stable/c/4b75ff0aedd6ade1018ad4a3a9d8336794e36e42 (opens in a new tab)
- git.kernel.org/stable/c/ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3 (opens in a new tab)
- git.kernel.org/stable/c/0fda873092b541bb5a9b87d728a2429f863f8cfa (opens in a new tab)
- git.kernel.org/stable/c/69402908e277dd164bf8d7c8fd0513c0fac28e9e (opens in a new tab)
- git.kernel.org/stable/c/f2664bc4f0f356f17c2094587a2b3665e3867e44 (opens in a new tab)
- git.kernel.org/stable/c/5d2249eefaca59908fe3c264b8eca526424dcfbe (opens in a new tab)
- git.kernel.org/stable/c/2428083101f6883f979cceffa76cd8440751ffe6 (opens in a new tab)