{"id":"CVE-2026-68301","state":"PUBLISHED","title":"net: hsr: fix memory leak on slave unregistration by removing synced VLANs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: fix memory leak on slave unregistration by removing synced VLANs\n\nWhen an HSR master device is brought UP, it auto-adds VLAN 0 via\nvlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B).\n\nIf a slave device is later unregistered while HSR is active (e.g., during\nnetns cleanup or interface destruction), hsr_del_port() is called to\ndetach the slave port from the HSR master. However, hsr_del_port() currently\ndoes not delete the VLAN IDs that were synced to the slave device by HSR.\n\nAs a result, the slave device retains a refcount on VID 0 (and any other\nsynced VLANs). When the slave device is destroyed, its vlan_info /\nvlan_vid_info structure remains allocated, leading to a memory leak.\n\nFix this by calling vlan_vids_del_by_dev(port->dev, master->dev) in\nhsr_del_port() before unlinking slave A or slave B ports, matching the\npropagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid()\nand the cleanup behavior in bonding and team drivers.","publishedAt":"2026-08-10T12:02:35.155Z","updatedAt":"2026-08-19T16:32:53.463Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1100242709d5644856131a9dd25d32672ebe7357","status":"affected","lessThan":"ccc822e9e4f09a6c2ca73ad5334570441947f94f","versionType":"git"},{"version":"a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa","status":"affected","lessThan":"79ff0547676acdeceda445c3fce4071b0a887b70","versionType":"git"},{"version":"72dbae1f2f2159395089405c6c54632f2613f1be","status":"affected","lessThan":"f72c312af6c7897ab0f8a2b5a63f917a207a4143","versionType":"git"},{"version":"c707d2c5541d2bb94131968ad5dfeb06427a1dba","status":"affected","lessThan":"21d48408479a17eb65568a765930adea37e4d804","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"b5ded444621b6180df9f3d4e07045fc1fc1e8cd9","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"ae995b8002d3af134560a706c0e111a89e26317c","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"dcf15eaf5641812f1cfc5e96537380132a7da89d","versionType":"git"},{"version":"5.15.194","status":"affected","lessThan":"5.15.216","versionType":"semver"},{"version":"6.1.153","status":"affected","lessThan":"6.1.183","versionType":"semver"},{"version":"6.6.107","status":"affected","lessThan":"6.6.148","versionType":"semver"},{"version":"6.12.48","status":"affected","lessThan":"6.12.101","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_slave.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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_slave.c"]}],"references":["https://git.kernel.org/stable/c/ccc822e9e4f09a6c2ca73ad5334570441947f94f","https://git.kernel.org/stable/c/79ff0547676acdeceda445c3fce4071b0a887b70","https://git.kernel.org/stable/c/f72c312af6c7897ab0f8a2b5a63f917a207a4143","https://git.kernel.org/stable/c/21d48408479a17eb65568a765930adea37e4d804","https://git.kernel.org/stable/c/b5ded444621b6180df9f3d4e07045fc1fc1e8cd9","https://git.kernel.org/stable/c/ae995b8002d3af134560a706c0e111a89e26317c","https://git.kernel.org/stable/c/dcf15eaf5641812f1cfc5e96537380132a7da89d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68301.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68301","state":"PUBLISHED","datePublished":"2026-08-10T12:02:35.155Z","dateUpdated":"2026-08-19T16:32:53.463Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.380Z"},"containers":{"cna":{"title":"net: hsr: fix memory leak on slave unregistration by removing synced VLANs","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: fix memory leak on slave unregistration by removing synced VLANs\n\nWhen an HSR master device is brought UP, it auto-adds VLAN 0 via\nvlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B).\n\nIf a slave device is later unregistered while HSR is active (e.g., during\nnetns cleanup or interface destruction), hsr_del_port() is called to\ndetach the slave port from the HSR master. However, hsr_del_port() currently\ndoes not delete the VLAN IDs that were synced to the slave device by HSR.\n\nAs a result, the slave device retains a refcount on VID 0 (and any other\nsynced VLANs). When the slave device is destroyed, its vlan_info /\nvlan_vid_info structure remains allocated, leading to a memory leak.\n\nFix this by calling vlan_vids_del_by_dev(port->dev, master->dev) in\nhsr_del_port() before unlinking slave A or slave B ports, matching the\npropagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid()\nand the cleanup behavior in bonding and team drivers."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1100242709d5644856131a9dd25d32672ebe7357","status":"affected","lessThan":"ccc822e9e4f09a6c2ca73ad5334570441947f94f","versionType":"git"},{"version":"a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa","status":"affected","lessThan":"79ff0547676acdeceda445c3fce4071b0a887b70","versionType":"git"},{"version":"72dbae1f2f2159395089405c6c54632f2613f1be","status":"affected","lessThan":"f72c312af6c7897ab0f8a2b5a63f917a207a4143","versionType":"git"},{"version":"c707d2c5541d2bb94131968ad5dfeb06427a1dba","status":"affected","lessThan":"21d48408479a17eb65568a765930adea37e4d804","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"b5ded444621b6180df9f3d4e07045fc1fc1e8cd9","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"ae995b8002d3af134560a706c0e111a89e26317c","versionType":"git"},{"version":"1a8a63a5305e95519de6f941922dfcd8179f82e5","status":"affected","lessThan":"dcf15eaf5641812f1cfc5e96537380132a7da89d","versionType":"git"},{"version":"5.15.194","status":"affected","lessThan":"5.15.216","versionType":"semver"},{"version":"6.1.153","status":"affected","lessThan":"6.1.183","versionType":"semver"},{"version":"6.6.107","status":"affected","lessThan":"6.6.148","versionType":"semver"},{"version":"6.12.48","status":"affected","lessThan":"6.12.101","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/hsr/hsr_slave.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.6","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","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_slave.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ccc822e9e4f09a6c2ca73ad5334570441947f94f"},{"url":"https://git.kernel.org/stable/c/79ff0547676acdeceda445c3fce4071b0a887b70"},{"url":"https://git.kernel.org/stable/c/f72c312af6c7897ab0f8a2b5a63f917a207a4143"},{"url":"https://git.kernel.org/stable/c/21d48408479a17eb65568a765930adea37e4d804"},{"url":"https://git.kernel.org/stable/c/b5ded444621b6180df9f3d4e07045fc1fc1e8cd9"},{"url":"https://git.kernel.org/stable/c/ae995b8002d3af134560a706c0e111a89e26317c"},{"url":"https://git.kernel.org/stable/c/dcf15eaf5641812f1cfc5e96537380132a7da89d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:32:53.463Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.194","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.153","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.107","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.48","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}