{"id":"CVE-2026-100071","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: free learned nodes on device setup failure\n\nhsr_dev_finalize() can fail after a lower-device RX handler has\nalready been registered (slave A is added before t…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: free learned nodes on device setup failure\n\nhsr_dev_finalize() can fail after a lower-device RX handler has\nalready been registered (slave A is added before t…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < e691eee886871b933d772ffc76d66c80b4c0a25e","Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < 0a340ffd96943a49a78e367efac9517ca767d99b","Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < f7289e3492f2694dccd3d79287e0e31879b58650","Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < 65702339b3e9fd792f65d4b740928798194d86ce","Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < 49b01f2939abc676a6f9a118f07a10110ee5f683","Linux >= 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 < 7f16289b91eb316f170a6bd22d32e6c632f6a5b6","Linux 3.17"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T14:17:13.567","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100071","references":[{"url":"https://git.kernel.org/stable/c/0a340ffd96943a49a78e367efac9517ca767d99b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/49b01f2939abc676a6f9a118f07a10110ee5f683","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/65702339b3e9fd792f65d4b740928798194d86ce","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f16289b91eb316f170a6bd22d32e6c632f6a5b6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e691eee886871b933d772ffc76d66c80b4c0a25e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f7289e3492f2694dccd3d79287e0e31879b58650","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T14:09:46.377Z","slug":"CVE-2026-100071","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: free learned nodes on device setup failure\n\nhsr_dev_finalize() can fail after a lower-device RX handler has\nalready been registered (slave A is added before the failable slave B\nand interlink adds). RX handlers run in softirq regardless of the\nmaster's state, so frames received in that window can learn dynamic\nnodes into node_db, and the error unwind never releases them.\n\nFree both owned dynamic databases in the unwind, mirroring\nhsr_dellink(). proxy_node_db is provably empty on every current error\nexit (only interlink RX feeds it, and the interlink add is the last\nfailable step) and is freed for symmetry. The order is safe:\nhsr_del_port() unregisters each RX handler with synchronize_net()\nbefore hsr_del_nodes() runs, which removes remaining entries with\nlist_del_rcu() and defers their release with call_rcu() for readers\nalready under RCU.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}