Medium 5.5Published May 1, 2026

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

Updated under an hour ago (Oct 26, 2026, 5:00 PM ET)

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Exploited in the last 30 days

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/

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5fdeb0d372ab33b4175043a2a4a1730239a217f1 before f2dd9aaf6e2861337f5835f877a5b2becaf4b015; 5fdeb0d372ab33b4175043a2a4a1730239a217f1 builds before 4b75ff0aedd6ade1018ad4a3a9d8336794e36e42; from 5fdeb0d372ab33b4175043a2a4a1730239a217f1 before ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3; 5fdeb0d372ab33b4175043a2a4a1730239a217f1 builds before 0fda873092b541bb5a9b87d728a2429f863f8cfa; from 5fdeb0d372ab33b4175043a2a4a1730239a217f1 before 69402908e277dd164bf8d7c8fd0513c0fac28e9e; from 5fdeb0d372ab33b4175043a2a4a1730239a217f1 before f2664bc4f0f356f17c2094587a2b3665e3867e44; 5fdeb0d372ab33b4175043a2a4a1730239a217f1 builds before 5d2249eefaca59908fe3c264b8eca526424dcfbe; from 5fdeb0d372ab33b4175043a2a4a1730239a217f1 before 2428083101f6883f979cceffa76cd8440751ffe6	CNA record
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/f2dd9aaf6e2861337f5835f877a5b2becaf4b015	patch
https://git.kernel.org/stable/c/4b75ff0aedd6ade1018ad4a3a9d8336794e36e42	patch
https://git.kernel.org/stable/c/ff134cc43972d7ddceff8cfd36cf6b9eaafc00b3	patch
https://git.kernel.org/stable/c/0fda873092b541bb5a9b87d728a2429f863f8cfa	patch
https://git.kernel.org/stable/c/69402908e277dd164bf8d7c8fd0513c0fac28e9e	patch
https://git.kernel.org/stable/c/f2664bc4f0f356f17c2094587a2b3665e3867e44	patch
https://git.kernel.org/stable/c/5d2249eefaca59908fe3c264b8eca526424dcfbe	patch
https://git.kernel.org/stable/c/2428083101f6883f979cceffa76cd8440751ffe6	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.