{"api_version":"1","generated_at":"2026-08-22T17:47:29+00:00","cve":"CVE-2026-74726","urls":{"html":"https://cve.report/CVE-2026-74726","api":"https://cve.report/api/cve/CVE-2026-74726.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74726","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74726"},"summary":{"title":"bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave's\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:47","updated_at":"2026-08-22 16:16:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187","name":"https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815","name":"https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a","name":"https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c","name":"https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468","name":"https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d","name":"https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2","name":"https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71","name":"https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74726","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74726","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 f7668762bf5fd6db9397de5c0514407489d9d815 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 09add8d5cfa9c46828f51eaad162c36e86366b71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 b82f51681a7a88c7d3c865e817a3340d42b5fa2a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 dd148539fb4741d01c06b7d2c8bd84b01920756c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 dccec0227ed8d9e36936d66e256b957dc2858468 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 2faf75a8a06504071b4c0aea7e45a9cc49a4e187 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d0e81b7e2246a41d068ecaf15aac9de570816d63 683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.24","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.24 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.265 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/bonding/bond_alb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f7668762bf5fd6db9397de5c0514407489d9d815","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"09add8d5cfa9c46828f51eaad162c36e86366b71","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"b82f51681a7a88c7d3c865e817a3340d42b5fa2a","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"dd148539fb4741d01c06b7d2c8bd84b01920756c","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"dccec0227ed8d9e36936d66e256b957dc2858468","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"2faf75a8a06504071b4c0aea7e45a9cc49a4e187","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"},{"lessThan":"683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d","status":"affected","version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/bonding/bond_alb.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.24"},{"lessThan":"2.6.24","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.265","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.265","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"2.6.24","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.24","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave's\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:33:17.128Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"},{"url":"https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"},{"url":"https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"},{"url":"https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"},{"url":"https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"},{"url":"https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"},{"url":"https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"},{"url":"https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"}],"title":"bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74726","datePublished":"2026-08-22T15:33:17.128Z","dateReserved":"2026-08-15T05:44:03.929Z","dateUpdated":"2026-08-22T15:33:17.128Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:47","lastModifiedDate":"2026-08-22 16:16:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74726","Ordinal":"1","Title":"bonding: alb: re-check primary_is_promisc under RTNL in bond_alb","CVE":"CVE-2026-74726","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74726","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave's\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision.","Type":"Description","Title":"bonding: alb: re-check primary_is_promisc under RTNL in bond_alb"}]}}}