bonding: do not clear curr_active_slave prematurely when releasing all slaves

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Summary

CVECVE-2026-98074
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:36 UTC
Updated2026-09-25 11:17:36 UTC
DescriptionIn 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).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0896341a44bf04bf6149d9307fe4686006f3eee1 d6ef22e79c2be3612868daede0e9a84f05439d9e git Not specified
CNA Linux Linux affected 0896341a44bf04bf6149d9307fe4686006f3eee1 19ba7ecfade159b3702c78a360fd7d971e2b7109 git Not specified
CNA Linux Linux affected 0896341a44bf04bf6149d9307fe4686006f3eee1 6d0ee411d5437f3d126ea6979acb83a8da29dc81 git Not specified
CNA Linux Linux affected 0896341a44bf04bf6149d9307fe4686006f3eee1 af602c7aa5fedc9be3043244017aef4f26c96b70 git Not specified
CNA Linux Linux affected 3.9 Not specified
CNA Linux Linux unaffected 3.9 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/19ba7ecfade159b3702c78a360fd7d971e2b7109 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6ef22e79c2be3612868daede0e9a84f05439d9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af602c7aa5fedc9be3043244017aef4f26c96b70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d0ee411d5437f3d126ea6979acb83a8da29dc81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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