{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74726","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.929Z","datePublished":"2026-08-22T15:33:17.128Z","dateUpdated":"2026-08-22T15:33:17.128Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-22T15:33:17.128Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_alb.c"],"versions":[{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"f7668762bf5fd6db9397de5c0514407489d9d815","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"09add8d5cfa9c46828f51eaad162c36e86366b71","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"b82f51681a7a88c7d3c865e817a3340d42b5fa2a","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"dd148539fb4741d01c06b7d2c8bd84b01920756c","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"dccec0227ed8d9e36936d66e256b957dc2858468","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"2faf75a8a06504071b4c0aea7e45a9cc49a4e187","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2","status":"affected","versionType":"git"},{"version":"d0e81b7e2246a41d068ecaf15aac9de570816d63","lessThan":"683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/bonding/bond_alb.c"],"versions":[{"version":"2.6.24","status":"affected"},{"version":"0","lessThan":"2.6.24","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.24","versionEndExcluding":"7.2"}]}]}],"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"}}}}