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Vulnerability record · CVE-2026-100071 · published 25 September 2026

CVE-2026-100071: Linux kernel vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.11% · top 98.5%
5.5CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
21 Oct 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-100071), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.