CVE-2026-31419

취약점 유형

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/repo

영향받는 제품

• linux linux_kernel

참고 자료

• https://git.kernel.org/stable/c/00752893f96b344f258c9c6de18b33171ac4872c
• https://git.kernel.org/stable/c/2884bf72fb8f03409e423397319205de48adca16
• 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