CVE-2026-98074
UnknownSummary
In the Linux kernel, a vulnerability in the bonding driver involves prematurely clearing the curr_active_slave pointer when releasing all interfaces. This can lead to a promiscuous mode leak on the physical device after bond teardown.
Risk Assessment
The risk includes persistent promiscuous mode on a physical interface, which may compromise network traffic privacy and increase susceptibility to sniffing attacks.
Recommendation
It is recommended to update the Linux kernel to a version with the fix that prevents premature clearing of the pointer and ensures proper invocation of functions managing promiscuous mode.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bonding: do not clear curr_active_slave prematurely when releasing all slaves When releasing all slaves during bond destruction (all == true), __bond_release_one() unconditionally clears bond->curr_active_slave to NULL in every iteration. If a backup slave is released before the active slave, bond_alb_deinit_slave() triggers rlb_teach_disabled_mac_on_primary(), which increments the active slave dev promiscuity counter and sets bond_info->primary_is_promisc = 1. Because bond->curr_active_slave was prematurely cleared to NULL when releasing the backup slave, the subsequent iteration releasing the active slave evaluates oldcurrent as NULL, so bond_change_active_slave(bond, NULL) is skipped. Consequently, bond_alb_handle_active_change() is never called to decrement the promiscuity counter, permanently leaking promiscuous mode on the physical device after bond teardown. When oldcurrent == slave, bond_change_active_slave(bond, NULL) already sets bond->curr_active_slave to NULL. We only need to avoid selecting a new active slave when all == true. Replace the if (all) branch with if (!all && oldcurrent == slave).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS