Medium 5.5Published Sep 25, 2026

CVE-2026-100071net: hsr: free learned nodes on device setup failure

Updated under an hour ago (Oct 27, 2026, 1:20 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: hsr: free learned nodes on device setup failure hsr_dev_finalize() can fail after a lower-device RX handler has already been registered (slave A is added before the failable slave B and interlink adds). RX handlers run in softirq regardless of the master's state, so frames received in that window can learn dynamic nodes into node_db, and the error unwind never releases them. Free both owned dynamic databases in the unwind, mirroring hsr_dellink(). proxy_node_db is provably empty on every current error exit (only interlink RX feeds it, and the interlink add is the last failable step) and is freed for symmetry. The order is safe: hsr_del_port() unregisters each RX handler with synchronize_net() before hsr_del_nodes() runs, which removes remaining entries with list_del_rcu() and defers their release with call_rcu() for readers already under RCU.

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: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 before e691eee886871b933d772ffc76d66c80b4c0a25e; 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 builds before 0a340ffd96943a49a78e367efac9517ca767d99b; from 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 before f7289e3492f2694dccd3d79287e0e31879b58650; from 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 before 65702339b3e9fd792f65d4b740928798194d86ce; 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 builds before 49b01f2939abc676a6f9a118f07a10110ee5f683; 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 builds before 7f16289b91eb316f170a6bd22d32e6c632f6a5b6	CNA record
linux linux_kernel linux:linux_kernel	from 3.17 before 6.1.188; from 6.2 before 6.6.157; from 6.7 before 6.12.110; from 6.13 before 6.18.52; from 6.19 before 7.2.6	NVD

References

References

https://git.kernel.org/stable/c/e691eee886871b933d772ffc76d66c80b4c0a25e	patch
https://git.kernel.org/stable/c/0a340ffd96943a49a78e367efac9517ca767d99b	patch
https://git.kernel.org/stable/c/f7289e3492f2694dccd3d79287e0e31879b58650	patch
https://git.kernel.org/stable/c/65702339b3e9fd792f65d4b740928798194d86ce	patch
https://git.kernel.org/stable/c/49b01f2939abc676a6f9a118f07a10110ee5f683	patch
https://git.kernel.org/stable/c/7f16289b91eb316f170a6bd22d32e6c632f6a5b6	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.