{"id":"DEBIAN-CVE-2026-74660","details":"In the Linux kernel, the following vulnerability has been resolved:  netfilter: ebt_nflog: pin the NFLOG backend  nf_log_unregister() runs after the per-net teardown so its final RCU grace period also drains readers that obtained the logger from a per-net binding.  However, ebt_nflog passes an explicit ULOG log type to nf_log_packet() without holding a reference on the selected logger module, unlike the xt_NFLOG and nft_log frontends.  An ebtables nflog rule can therefore remain callable while nfnetlink_log is unloaded.  The resulting interleaving is:    CPU 0                               CPU 1   nfnetlink_log_fini()     unregister_pernet_subsys()       kfree(nfnl_log_pernet(net))                                       ebt_nflog_tg()                                         nf_log_packet()                                           nfulnl_log_packet()                                             instance_lookup_get_rcu()  The global ULOG logger is still registered at this point, so CPU 1 dereferences the per-net state after CPU 0 has freed it.  KASAN reported:    BUG: KASAN: slab-use-after-free in instance_lookup_get_rcu   Read of size 8 at addr ff110001052e6210 by task poc/92   Call Trace:    instance_lookup_get_rcu+0x1ce/0x1f0 [nfnetlink_log]    nfulnl_log_packet+0x248/0x2fb0 [nfnetlink_log]    nf_log_packet+0x204/0x300    ebt_nflog_tg+0x351/0x550    ebt_do_table+0xedf/0x22b0   Allocated by task 90:    __kmalloc_noprof+0x186/0x470    ops_init+0x6d/0x420    register_pernet_operations+0x2f6/0x670    register_pernet_subsys+0x23/0x40   Freed by task 93:    kfree+0x131/0x3c0    ops_undo_list+0x3e3/0x700    unregister_pernet_operations+0x232/0x490    unregister_pernet_subsys+0x1c/0x30    nfnetlink_log_fini+0x34/0x450 [nfnetlink_log]  Acquire the ULOG logger module reference when an ebt_nflog rule is validated and release it when the rule is destroyed.  Request the NFLOG backend for legacy callers when needed, matching xt_NFLOG.  This prevents module teardown until all ebt_nflog rules have stopped using the logger.","modified":"2026-09-19T22:01:50.053961957Z","published":"2026-08-22T16:16:39.743Z","upstream":["CVE-2026-74660"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-74660"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.187-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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