{"id":"CVE-2026-100071","state":"PUBLISHED","title":"net: hsr: free learned nodes on device setup failure","description":"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 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.","publishedAt":"2026-09-25T13:06:44.956Z","updatedAt":"2026-10-19T08:43:03.400Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"e691eee886871b933d772ffc76d66c80b4c0a25e","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"0a340ffd96943a49a78e367efac9517ca767d99b","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"f7289e3492f2694dccd3d79287e0e31879b58650","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"65702339b3e9fd792f65d4b740928798194d86ce","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"49b01f2939abc676a6f9a118f07a10110ee5f683","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"7f16289b91eb316f170a6bd22d32e6c632f6a5b6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_device.c"]}],"references":["https://git.kernel.org/stable/c/e691eee886871b933d772ffc76d66c80b4c0a25e","https://git.kernel.org/stable/c/0a340ffd96943a49a78e367efac9517ca767d99b","https://git.kernel.org/stable/c/f7289e3492f2694dccd3d79287e0e31879b58650","https://git.kernel.org/stable/c/65702339b3e9fd792f65d4b740928798194d86ce","https://git.kernel.org/stable/c/49b01f2939abc676a6f9a118f07a10110ee5f683","https://git.kernel.org/stable/c/7f16289b91eb316f170a6bd22d32e6c632f6a5b6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/100xxx/CVE-2026-100071.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100071","state":"PUBLISHED","datePublished":"2026-09-25T13:06:44.956Z","dateUpdated":"2026-10-19T08:43:03.400Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.456Z"},"containers":{"cna":{"title":"net: hsr: free learned nodes on device setup failure","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"e691eee886871b933d772ffc76d66c80b4c0a25e","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"0a340ffd96943a49a78e367efac9517ca767d99b","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"f7289e3492f2694dccd3d79287e0e31879b58650","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"65702339b3e9fd792f65d4b740928798194d86ce","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"49b01f2939abc676a6f9a118f07a10110ee5f683","versionType":"git"},{"version":"81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8","status":"affected","lessThan":"7f16289b91eb316f170a6bd22d32e6c632f6a5b6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_device.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_device.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e691eee886871b933d772ffc76d66c80b4c0a25e"},{"url":"https://git.kernel.org/stable/c/0a340ffd96943a49a78e367efac9517ca767d99b"},{"url":"https://git.kernel.org/stable/c/f7289e3492f2694dccd3d79287e0e31879b58650"},{"url":"https://git.kernel.org/stable/c/65702339b3e9fd792f65d4b740928798194d86ce"},{"url":"https://git.kernel.org/stable/c/49b01f2939abc676a6f9a118f07a10110ee5f683"},{"url":"https://git.kernel.org/stable/c/7f16289b91eb316f170a6bd22d32e6c632f6a5b6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:43:03.400Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}