CVE-2026-31419net: bonding: fix use-after-free in bond_xmit_broadcast()

Official description

In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix use-after-free in bond_xmit_broadcast() bond_xmit_broadcast() reuses the original skb for the last slave (determined by bond_is_last_slave()) and clones it for others. Concurrent slave enslave/release can mutate the slave list during RCU-protected iteration, changing which slave is "last" mid-loop. This causes the original skb to be double-consumed (double-freed). Replace the racy bond_is_last_slave() check with a simple index comparison (i + 1 == slaves_count) against the pre-snapshot slave count taken via READ_ONCE() before the loop. This preserves the zero-copy optimization for the last slave while making the "last" determination stable against concurrent list mutations. The UAF can trigger the following crash: ================================================================== BUG: KASAN: slab-use-after-free in skb_clone Read of size 8 at addr ffff888100ef8d40 by task exploit/147 CPU: 1 UID: 0 PID: 147 Comm: exploit Not tainted 7.0.0-rc3+ #4 PREEMPTLAZY Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:123) print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:597) skb_clone (include/linux/skbuff.h:1724 include/linux/skbuff.h:1792 include/linux/skbuff.h:3396 net/core/skbuff.c:2108) bond_xmit_broadcast (drivers/net/bonding/bond_main.c:5334) bond_start_xmit (drivers/net/bonding/bond_main.c:5567 drivers/net/bonding/bond_main.c:5593) dev_hard_start_xmit (include/linux/netdevice.h:5325 include/linux/netdevice.h:5334 net/core/dev.c:3871 net/core/dev.c:3887) __dev_queue_xmit (include/linux/netdevice.h:3601 net/core/dev.c:4838) ip6_finish_output2 (include/net/neighbour.h:540 include/net/neighbour.h:554 net/ipv6/ip6_output.c:136) ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219) ip6_output (net/ipv6/ip6_output.c:250) ip6_send_skb (net/ipv6/ip6_output.c:1985) udp_v6_send_skb (net/ipv6/udp.c:1442) udpv6_sendmsg (net/ipv6/udp.c:1733) __sys_sendto (net/socket.c:730 net/socket.c:742 net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Allocated by task 147: Freed by task 147: The buggy address belongs to the object at ffff888100ef8c80 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 192 bytes inside of freed 224-byte region [ffff888100ef8c80, ffff888100ef8d60) Memory state around the buggy address: ffff888100ef8c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff888100ef8c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888100ef8d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888100ef8d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888100ef8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/060d83bb6147c36fc21134d5b332d266b8c176bc
• https://git.kernel.org/stable/c/df690112b2172e8eb0f4dd8ec1019b65ee979203
• https://git.kernel.org/stable/c/00752893f96b344f258c9c6de18b33171ac4872c
• https://git.kernel.org/stable/c/2de5c8eea0a9db99dae7c36f4b541b74b41d3a04
• https://git.kernel.org/stable/c/a0f661918edc79d7a75e468128af8d41e2a1a83a
• https://git.kernel.org/stable/c/d4cc7e4c80b1634c7b1497574a2fdb18df6c026c
• https://git.kernel.org/stable/c/f5b94654a4a19891a8108d66ef166de6c028c6cd
• https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16
• https://access.redhat.com/security/cve/CVE-2026-31419 vdb-entry, x_refsource_REDHAT
• RHBZ#2457829 issue-tracking, x_refsource_REDHAT
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31419.json x_sadp-csaf-vex
• https://access.redhat.com/errata/RHSA-2026:22334 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:13566 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:25191 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:22940 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:21209 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:23224 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:25217 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:35870 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:27353 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36530 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:19521 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36531 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36532 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36533 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36534 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:36172 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:27354 vendor-advisory, x_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:22900 vendor-advisory, x_refsource_REDHAT